Alliance Laundry Systems CT035L, CT035N, CHD35G2, CU035L, CU035N Troubleshooting Manual

Tumble Dryers

S TART

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H I G H T E M P

M E D T E M P

L O W T E M P

N O H E A T

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S E L E

C T

T E M P

I N S E R T

C O I N

P U S H S T A R

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25 Pound Capacity 30 Pound Capacity 35 Pound Capacity 55 Pound Capacity

Starting Serial No. 0602004144

Refer to Page 7 for Model Numbers

Troubleshooting

www.alliancelaundry.com

T463PE1A

Part No. 70380601R4

January 2013

Table of

Contents

Section 1 – Safety Information .......................................................... 5

Locating an Authorized Service Person ............................................... 7

Safety Warnings and Decals................................................................. 7

Safety Precautions for Servicing Tumble Dryers ................................. 7

Section 2 – Introduction ..................................................................... 9

Model Identification ............................................................................. 9

Serial Plate Location............................................................................. 12

Customer Service.................................................................................. 12

Wiring Diagram.................................................................................... 12

How a Tumble Dryer Works ................................................................ 13

Theory of Operation ............................................................................. 14

Section 3 – Machine Troubleshooting............................................... 17

1. Tumble Dryer Does Not Start .................................................. 18

2. Motor Does Not Start............................................................... 19

3. Motor Overload Protector Cycles Repeatedly ......................... 20

4. Motor Runs But Cylinder Does Not Turn................................ 21

5. Motor Does Not Stop ............................................................... 22

6. No Heat Condition (Non-CE and Non-Australian Models)..... 23

7. Burner Does Not Ignite............................................................ 25

8. Burner Ignites and Goes Out Repeatedly................................. 28

9. Burner Does Not Shut Off ....................................................... 29

10. Clothes Do Not Dry ................................................................. 30

11. Tumble Dryer Overheating ...................................................... 32

12. Burner Not Burning Properly................................................... 33

13. Loading Door Opens During Operation................................... 34

14. Cylinder Continues to Spin with Door Open........................... 35

15. Coin Does Not Fall into Coin Vault or Coin Drop Sensor

Does Not Register that Coin Has Been Entered ...................... 36

16. Cylinder Is “Stained” ............................................................... 39

Section 4 – Fire Supression System Troubleshooting...................... 40

17. Tumble Dryer Does Not Operate and Light Is On................... 41

18. Water Discharge, but No Fire .................................................. 42

19. Tumble Dryer Does Not Operate and Light Is Off .................. 43

20. Tumble Dryer Operates, but Water Does Not Discharge

and Light Is On ........................................................................ 44

Section 5 – Adjustments ..................................................................... 46

21. Loading Door Switch............................................................... 46

22. Loading Door Strike................................................................. 46

23. Aligning Door Strike................................................................ 47

24. Cleaning Coin Drop ................................................................. 47

Section 6 – Micro Display Control (MDC) Troubleshooting.......... 50

Models with BC, BL, BX and BY Control Suffixes

25. Coins Ignored When Entered................................................... 50

26. Control Has No Display........................................................... 51

means without the expressed written consent of the publisher.

70380601 1

27. Door Open Indicator ................................................................ 53

28. Motor Will Not Start/Run ........................................................ 55

29. Unit Will Not Heat – Gas......................................................... 59

30. Unit Will Not Heat – Steam..................................................... 62

31. Unit Will Not Heat – Electric .................................................. 65

32. Error Codes .............................................................................. 68

Gas and Steam Models

Control Circuit Schematic.................................................................69

Control Circuit Connection...............................................................70

Gas and Steam Models

Control Box Schematic .....................................................................71

Control Box Connection ...................................................................72

Gas and Steam Models

Control Circuit Schematic.................................................................73

Gas and Steam Models

Control Circuit Schematic.................................................................74

Gas and Steam Models

Control Box Schematic .....................................................................75

Control Box Connection ...................................................................76

Electric Models

Control Circuit Schematic.................................................................77

Control Circuit Connection...............................................................78

Electric Models

Control Box Connection ...................................................................79

Control Box Schematic .....................................................................80

Section 7 – On Premise Micro Control Troubleshooting................ 81

Models with OM Control Suffix

33. Control Has No Display........................................................... 82

34. Door Open Indicator ................................................................ 84

35. Motor Will Not Start/Run ........................................................ 87

36. Unit Will Not Heat – Gas......................................................... 90

37. Unit Will Not Heat – Steam..................................................... 93

38. Unit Will Not Heat – Electric .................................................. 96

39. Error Codes .............................................................................. 99

Section 8 – NetMaster Troubleshooting ........................................... 100

Models with NC, NR, NX, NY, ZC, ZR, ZX and ZY

Control Suffixes

40. No Infra-red (IR) Communication ........................................... 100

41. Coins Ignored When Entered................................................... 101

42. Control Has No Display........................................................... 102

43. Door Open Indicator ................................................................ 104

44. Motor Will Not Start/Run ........................................................ 106

45. Unit Will Not Heat – Gas......................................................... 110

46. Unit Will Not Heat – Steam..................................................... 113

Section 9 – Hybrid Timer Control Troubleshooting ....................... 115

Models with QT, SD and SX Control Suffixes

47. Coins Ignored When Entered................................................... 115

2 70380601

48. Control Has No Display – OPL Models .................................. 116

49. Display Flashes “dr” With Door Closed – OPL Models ......... 119

50. Vend Satisfied, No In Use LED – Coin Models...................... 122

51. In Use LED Lit, No Motor Run – Coin Models ...................... 126

52. Motor Will Not Start/Run – Coin Models ............................... 129

53. Motor Will Not Start/Run – OPL Models................................ 132

54. Unit Will Not Heat – Gas – Coin Models................................ 135

55. Unit Will Not Heat – Gas – OPL Models ................................ 138

56. Unit Will Not Heat – Electric OPL.......................................... 141

57. Error Codes .............................................................................. 145

Section 10 – Electronic Control Troubleshooting............................ 146

Models with KB, KC, KX, KV, KW, KY, LC, LX, LY, WC,

WX and WY Control Suffixes

58. No Infrared Communication .................................................... 147

59. Coins Ignored When Entered................................................... 148

60. No Display ............................................................................... 149

61. “Door Open” Indicator............................................................. 151

62. No Start/Run ............................................................................ 153

63. Unit Will Not Heat – Gas......................................................... 155

64. Unit Will Not Heat – Steam..................................................... 158

65. Unit Will Not Heat – Electric .................................................. 160

66. CE Models No Display ............................................................ 163

67. CE Models “Door Open” Indicator.......................................... 165

68. CE Models No Start/Run ......................................................... 167

69. CE Models Will Not Heat – Gas/Steam................................... 169

70. CE Models Will Not Heat – Electric ....................................... 172

Section 11 – LED OPL and UniLinc Troubleshooting.................... 175

Models with EO, RE, RU and UO Control Suffixes

71. No Fan Motor Rotation ............................................................ 176

72. No Drive Motor Rotation......................................................... 179

73. Stove and Cabinet Limit Errors ............................................... 182

74. No Display ............................................................................... 184

75. Airflow Errors .......................................................................... 186

76. Fan Motor Centrifugal Switch Error........................................ 188

77. Close Door Indication .............................................................. 190

78. Moisture Sensor Error.............................................................. 192

Troubleshooting the Moisture Sensor Circuit....................................... 194

79. Troubleshooting at the Control ................................................ 194

80. Troubleshooting From Control to Slip Ring Assembly........... 196

81. Troubleshooting At Slip Ring Assembly................................. 198

82. Troubleshooting From Slip Ring Assembly to Moisture

Sensing Baffle and Basket ....................................................... 198

83. Troubleshooting from Basket Shaft to Moisture Sensing

Baffle with Machine Basket Removed .................................... 198

84. Troubleshooting at the Moisture Sensing Baffles with

Machine Basket Removed ....................................................... 199

85. Fan Motor Contactor Error ...................................................... 200

70380601 3

86. Rotation Sensor Error............................................................... 202

87. Shorted or Open Thermistor .................................................... 204

88. Fuses and Transformer Configuration Jumper......................... 206

89. Dip Switch/Harness Index Mismatch ...................................... 207

90. Electronic Control Testing....................................................... 208

91. Diagnostic Testing ................................................................... 216

4 70380601

Section 1

Danger indicates an imminently hazardous situation that, if not avoided, will cause severe personal injury or death.

DANGER

Warning indicates a hazardous situation that, if not avoided, could cause severe personal injury or death.

WARNING

Caution indicates a hazardous situation that, if not avoided, may cause minor or moderate personal injury or property damage.

CAUTION

•Failure to install, maintain and/or operate this product according to the manufacturer’s instructions may result in conditions which can produce serious injury, death and/or property damage.

•Do not repair or replace any part of the product or attempt any servicing unless specifically recommended or published in this Service Manual and unless you understand and have the skills to carry out the servicing.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the product is properly grounded and to reduce the risk of fire, electric shock, serious injury or death.

W006R2

WARNING

Safety Information

Throughout this manual and on machine decals, you will find precautionary statements (“CAUTION”, “WARNING”, and “DANGER”) followed by specific instructions. These precautions are intended for the personal safety of the operator, user, servicer, and those maintaining the machine.

Additional precautionary statements (“IMPORTANT” and “NOTE”) are followed by specific instructions.

IMPORTANT: The word “IMPORTANT” is used

to inform the reader of specific procedures where minor machine damage will occur if the procedure is not followed.

NOTE: The word “NOTE” is used to communicate installation, operation, maintenance or servicing information that is important but not hazard related.

In the interest of safety, some general precautions relating to the operation of this machine follow.

70380601 5

Safety Information

To re d uc e th e r is k o f e l ec tri c s h oc k, fir e, explosion, serious injury or death:

•Disconnect electric power to the tumble dryer before servicing.

•Never start the tumble dryer with any guards/panels removed.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the tumble dryer is properly grounded.

W240R1

WARNING

Repairs that are made to your products by unqualified persons can result in hazards due to improper assembly or adjustments subjecting you, or the inexperienced person making such repairs, to the risk of serious injury, electrical shock, or death.

W007

WARNING

If you or an unqualified person perform service on your product, you must assume the responsibility for any personal injury or property damage which may result. The manufacturer will not be responsible for any injury or property damage arising from improper service and/or service procedures.

W008

CAUTION

IMPORTANT INFORMATION: During the lifetime of a tumble dryer, it may require service. The information contained in this manual was written and is intended for use by qualified service technicians who are familiar with the safety procedures required in the repair of a tumble dryer, and who are equipped with the proper tools and testing equipment.

NOTE: The WARNING and IMPORTANT instructions appearing in this manual are not meant to cover all possible conditions and situations that may occur. It must be understood that common sense, caution and carefulness are factors which CANNOT be built into this tumble dryer. These factors MUST BE supplied by the person(s) installing, maintaining or operating the tumble dryer.

Always contact your dealer, distributor, service agent or the manufacturer on any problems or conditions you do not understand.

6 70380601

Safety Information

Locating an Authorized Service Person

Alliance Laundry Systems is not responsible for personal injury or property damage resulting from improper service. Review all service information before beginning repairs.

Warranty service must be performed by an authorized technician, using authorized factory parts. If service is required after the warranty expires, Alliance Laundry Systems also recommends contacting an authorized technician and using authorized factory parts.

Safety Warnings and Decals

SAFETY WARNINGS and decals have been provided in key locations to remind you of important precautions for the safe operation and maintenance of your tumble dryer. Please take the time to review these warnings before proceeding with service work.

All decals have been designed and applied to withstand washing and cleaning. Decals should be checked periodically to be sure they have not been damaged, removed, or painted.

Safety Precautions for Servicing Tumble D rye rs

Prior to servicing tumble dryer:

• Disconnect electrical service and “lockout” to prevent unintentional connection.

• Shut off supply gas valve.

• Allow machine to cool prior to servicing.

After servicing tumble dryer:

• Control/access panels must be reinstalled.

• Motor/drive/belt guards must be reinstalled.

• Contactor/junction/accessory box covers must

be reinstalled.

• Use a non-corrosive leak detection solution to check all pipe connections for gas leaks. DO NOT USE AN OPEN FLAME TO CHECK FOR GAS LEAKS!

• The loading door switch, lint door switch and airflow switch must be operating properly.

70380601 7

Safety Information

8 70380601

Section 2

Introduction

Model Identification

Information in this manual is applicable to these models:

Gas Steam Electric

CHD25G2-CA025L CHD25G2-CA025N CHD25G2-CT025L CHD25G2-CT025N CHD25G2-CU025L CHD25G2-CU025N CK025N DR25G2-BA025L DR25G2-BA025N DR25G2-BK025N

25

Pound

30

Pound

DR25G2-BT025L DR25G2-BT025N DR25G2-BU025L DR25G2-BU025N GA025L GA025N GT025L GT025N GU025L GU025N HA025L HA025N

CHD30G2-CA030L CHD30G2-CA030N CHD30G2-CT030L CHD30G2-CT030N CHD30G2-CU030L CHD30G2-CU030N CK030N DR30G2-BA030L DR30G2-BA030N DR30G2-BK030N DR30G2-BT030D DR30G2-BT030L DR30G2-BT030N DR30G2-BU030L DR30G2-BU030N GA030L GA030N GT030L GT030N GU030L GU030N HA030L HA030N

Models continued on next page.

HT025L HT025N HU025L HU025N IPD25G2 IT025L IT025N KA025L KA025N KT025L KT025N KU025L KU025N LA025L LA025N LT025L LT025N LU025L LU025N PA025L PA025N PT025L

HK030N HT030D HT030L HT030N HU030L HU030N IPD30G2 IT030L IT030N KA030L KA030N KT030L KT030N KU030L KU030N LA030L LA030N LT030L LT030N LU030L LU030N PA030L PA030N

PT025N PU025L PU025N SA025L SA025N SK025N ST025L ST025N SU025L SU025N UA025L UA025N UK025N UT025L UT025N UU025L UU025N YT025L YT025N YU025L YU025N

PT030L PT030N PU030L PU030N SA030L SA030N SK030N ST030D ST030L ST030N SU030L SU030N UA030L UA030N UK030N UT030L UT030N UU030L UU030N YT030L YT030N YU030L YU030N

CHD25S2-CT025S CHD25S2-CU025S DR25S2-BT025S DR25S2-BU025S GT025S GU025S HT025S HU025S IPD25S2 IT025S KT025S KU025S LT025S LU025S PT025S PU025S ST025S SU025S UT025S UU025S YT025S YU025S

CHD30S2-CT030S CHD30S2-CU030S DR30S2-BT030S DR30S2-BU030S GT030S GU030S HT030S HU030S IPD30S2 IT030S KT030S KU030S LT030S LU030S PT030S PU030S ST030S SU030S UT030S UU030S YT030S YU030S

CHD25E2-CT025E CHD25E2-CU025E DR25E2-BT025E DR25E2-BU025E GT025E GU025E HT025E HU025E IPD25E2 IT025E KT025E KU025E LT025E LU025E PT025E PU025E ST025E SU025E UT025E UU025E YT025E YU025E

CHD30E2-CT030E CHD30E2-CU030E DR30E2-BT030E DR30E2-BU030E GT030E GU030E HT030E HU030E IPD30E2 IT030E KT030E KU030E LT030E LU030E PT030E PU030E ST030E SU030E UT030E UU030E YT030E YU030E

70380601 9

Introduction

35

Pound

55

Pound

AT035L AT035N CHD35G2-CA035L CHD35G2-CA035N CHD35G2-CT035L CHD35G2-CT035N CHD35G2-CU035L CHD35G2-CU035N CK035N DR35G2-BA035L DR35G2-BA035N DR35G2-BK035N DR35G2-BT035L DR35G2-BT035N DR35G2-BU035L DR35G2-BU035N GA035L GA035N GT035L GT035N GU035L GU035N HA035L

CA055L CA055N CK055N CT055L CT055N CU055L CU055N DR55SG2-BA055L DR55SG2-BA055N DR55SG2-BK055N DR55SG2-BT055D DR55SG2-BT055L DR55SG2-BT055N DR55SG2-BU055L DR55SG2-BU055N GA055L GA055N GT055L

HA035N HK035N HT035L HT035N HU035L HU035N IPD35G2 IT035L IT035N KA035L KA035N KT035L KT035N KU035L KU035N LA035L LA035N LT035L LT035N LU035L LU035N PA035L PA035N

GT055N GU055L GU055N HA055L HA055N HK055N HT055D HT055L HT055N HU055L HU055N IPD55G2 IT055L IT055N KA055L KA055N KT055L KT055N

Gas Steam Electric

PT035L PT035N PU035L PU035N SA035L SA035N SK035N ST035L ST035N SU035L SU035N UA035L UA035N UK035N UT035L UT035N UU035L UU035N YT035L YT035N YU035L YU035N

KU055L KU055N SA055L SA055N SK055N ST055D ST055L ST055N SU055L SU055N UA055L UA055N UK055N UT055L UT055N UU055L UU055N

(see next page for suffixes)

AT035S CHD35S2-CT035S CHD35S2-CU035S DR35S2-BT035S DR35S2-BU035S GT035S GU035S HT035S HU035S IPD35S2 IT035S KT035S KU035S LT035S LU035S PT035S PU035S ST035S SU035S UT035S UU035S YT035S YU035S

Not

Applicable

AT035E CHD35E2-CT035E CHD35E2-CU035E DR35E2-BT035E DR35E2-BU035E GT035E GU035E HT035E HU035E IPD35E2 IT035E KT035E KU035E LT035E LU035E PT035E PU035E ST035E SU035E UT035E UU035E YT035E YU035E

CT055E CU055E DR55SE2-BT055E DR55SE2-BU055E GT055E HT055E HU055E IPD55E2 IT055E KT055E ST055E SU055E UT055E UU055E

10 70380601

Includes models with the following control suffixes:

Introduction

3B – reversing DX4 vended 3O – DX4 OPL 3V – DX4 vended 3W – reversing DX4 prep for coin 3X – DX4 prep for coin BB – reversing basic electronic, coin BC – basic electronic, coin BG – basic electronic, OPL mode BL – basic electronic, central pay BW – reversing basic electronic, prep

for coin BX – basic electronic, prep for coin BY – basic electronic, prep for card BZ – reversing basic electronic, prep

for card DO – DMP OPL DV – DMP vended DX – DMP prep for coin EO – LED OPL KB – reversing single coin KC – single coin

KW – reversing prep for coin KX – prep for coin KY – prep for card KZ – reversing prep for card LB – reversing network adaptable

coin LC – network adaptable coin LW – rev ersin g net work adapt able,

prep for coin LX – network adaptable, prep for

coin LY – network adaptable, prep for

card LZ – reversing network adaptable,

prep for card NC – NetMaster coin NR – NetMaster card NX – NetMaster, prep for coin NY – NetMaster, prep for card OM – OPL micro QT – dual digital timer

R3 – reversing DX4 OPL RE – reversing LED OPL RQ – reversing dual digital timer RU – reversing UniLinc OPL SD – single drop SX – single drop, prep for coin UO – UniLinc OPL WB – reversing network ready coin WC – network ready coin WW –reversing network ready, prep

for coin WX – network ready, prep for coin WY – network ready, prep for card WZ – reversing network ready, prep

for card ZC – NetMaster network coin ZR – NetMaster network card ZX – NetMaster network, prep for

coin ZY – NetMaster network, prep for

card

70380601 11

Introduction

1

Serial Plate Location

When calling or writing about your product, be sure to mention model and serial numbers. Model and serial numbers are located on serial plate as shown.

1 Serial Plate

Customer Service

If literature or replacement parts are required, contact the source from which the machine was purchased or contact Alliance Laundry Systems at (920) 748-3950 for the name and address of the nearest authorized parts distributor.

For technical assistance, call +1 (920) 748-3121.

Wiring Diagram

The wiring diagram is located inside the contactor or junction box.

The wiring diagram part number is located in the lower portion of the electrical data on the serial plate.

TMB2098N

12 70380601

How a Tumble Dryer Works

1

2

3

T001CE3A

1

2

3

Introduction

A tumble dryer uses heated air to dry loads of laundry.

When the motor is started, the exhaust fan pulls room temperature air in through the air intake at the rear of the tumble dryer and over the heat source (burner flame for gas, heating element for electric, and coil for steam).

The heated air moves into the cylinder, where it is circulated through the wet load by the tumbling action of the cylinder.

The air then passes through the lint filter, exhaust fan, and is vented to the outdoors.

70380601 13

Introduction

1

2

5

4

3

Theory of Operation

IMPORTANT: The fire suppression system is designed to diminish a laundry fire starting inside a fire suppression system equipped tumble dryer. The fire suppression system is not designed to stop or eliminate high temperature and spontaneous combustion situations. Follow all instructions in the installation manual to ensure the fire suppression system operates properly. Train all operators in the proper preventative maintenance of the fire suppression system.

IMPORTANT: For safety purposes, do not operate tumble dryer if a fire has occurred.

1 Te mp e ra t ur e S e ns o rs 4 Fire Suppression System Control Box 2 Loading Door 5 Water Flow to Machine 3 Load

Figure 1

TMB2257N

14 70380601

Tempe rature Sen so r

3

4

5

6

7

1

2

Two temp e rature sensors are lo c ated i n the c ylinder area of the tumble dryer to provide temperature readings. Refer to Figure 1 and Figure 2. These temperature sensors will trigger a mode change based on a pre-set temperature trip-point.

Introduction

TMB1999N

1 Opening for Auxiliary Alarm Cable 5 Light 2 Fuse 6 Reset Button 3 Auxiliary Alarm Fast-On Connection 7 Auxiliary Alarm Fast-On Connection 4 Te st Bu t to n

Figure 2

TMB1999N

70380601 15

Introduction

Power-Up Mode

Sends power to control, begins a status check

of the system. Can send control into Idle Mode

or Lockout Mode.

Idle Mode

Machine is operable while it monitors

temperature sensor readings. Control will enter

Power Disconnect Mode if temperature

trip-point is exceeded.

Power Disconnect Mode

Machine is disabled and controls on front will not

operate, will enter Power Disconnect Mode for one

second, then Water On Mode.

Water On Mode

Machine is disabled and controls on front will not operate. Remain in this mode

for 90 seconds, then enter Lockout Mode. Can enter Lockout Error Mode if both

temperature sensors become open, which occurs when temperature is below

40° F (4° C). Will enter Idle Mode if reset button is pressed. Refer to

Figure 2.

Lockout Mode

Machine is disabled and controls on front will not

operate. Control monitors temperature readings. Enters

Wat er On Mode if temperat ure t ri p-point is exc eed e d.

Will enter Idle Mode if reset button is pressed.

Lockout Error Mode

Machine is disabled and controls on front will not

operate. Water dispenses for four minutes. When the

reset button is pressed, the control enters Idle

Mode.

If temper ature trip-point exceeded

If both temperature sensors become open

Whe n reset button is pressed

If reset button is pressed

Modes of Operation

16 70380601

Section 3

To re d uc e th e r is k o f e l ec tri c s h oc k, fir e, exp lo s ion , s er i ou s i n ju ry or dea th:

•Disconnect electric power to the tumble dryer before servicing.

•Close gas shut-off valve to gas tumble dryer before servicing.

•Close steam valve to steam tumble dryer before servicing.

•Never start the tumble dryer with any guards/panels removed.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the tumble dryer is properly grounded.

W002R1

WARNING

Machine Troubleshooting

IMPORTANT: Refer to wiring diagram for aid in testing tumble dryer components.

70380601 17

Machine Troubleshooting

Tumble Dryer

Does Not Start

Is motor

relay

inoperative?

Test relay and

replace if

necessary.

Yes

Is

loading door

open?

No

Close loading

door

completely.

Is drying timer in an off position

(Hybrid Timer

Models)?

Yes

Turn drying

timer on.

Check that

proper amount

of coins are

inserted.

Is the

START button

not properly

activated

(Hybrid Timer

Models)?

Press and

hold

START button

for three

seconds.

Is the

electrical power

off or circuit

breaker or fuse

blown?

Close and

lock lint

panel.

Check fuse

(in junction box)

and replace if

necessary.

Is

there a

blown fuse

on tumble

dryer?

Test coin drop

and replace if

inoperative.

Yes

Is coin drop

inoperative?

Is there an

incorrect

amount of coins

inserted into

coin drop?

No

Yes

No

Yes

Check power

supply, or

replace fuses.

No

Is the lint

panel

open?

No

Yes

No

Yes

TMB2036S

Yes

No

1. Tumble Dryer Does Not Start

18 70380601

2. Motor Does Not Start

Motor Does

Not Start

Is the

electrical power

off or circuit

breaker fuse

blown?

No

Is the loading door switch or lint

panel switch not closed or switch

inoperative?

Is the

door switch

improperly

adjusted?

No

Check power

supply, or replace

fuses.

Yes

Close door, panel

or test switch and

replace if

inoperative.

Yes

Refer to

Adjustments

Section for door

switch adjustment.

Yes

Is the start

circuit not

complete?

Yes

Press and hold

START button for

three seconds.

Is the motor

inoperative?

Yes

Have motor tested

and replace if

inoperative.

No

Is the

cylinder or

cylinder motor

binding?

No

Refer to wiring

diagram.

Yes

Replace fan or

motor assembly.

Yes

Replace cylinder,

bearing, rollers, or

motor assembly.

Yes

Is the

transformer

inoperative?

Yes

Test and replace

if necessary.

Is the

motor relay

inoperative?

Yes

Test relay and replace

if inoperative.

Is

the fan or fan

motor

binding?

Is there

broken, loose,

or incorrect

wiring?

No

Is the

airflow switch

inoperative

(Hyrid Timer

Models)?

Yes

Test switch,

replace or adjust

as required.

No

TMB2037S

No

Machine Troubleshooting

70380601 19

Machine Troubleshooting

TMB1904S

Motor Overload

Protector

Cycles

Repeatedly

Is voltage

correct?

Refer to

Installation

Manual for

electrical

requirements.

Yes

Is clothes

load too

large?

No

Remove part of

load.

Yes

Is clothes

cylinder

binding?

Check cylinder

for binding.

Is wiring

adequate?

No

Yes

No

Check with

local power

company to

ensure that

wiring is

adequate.

Yes

Is make-up

air adequate?

Refer to

Installation

Manual for

make-up air

requirements.

No

Yes

Is

there lint

buildup around

tumble dryer or poor

maintenance?

Clean lint

accumulation

on and around

the motors.

No

Yes

Is there

broken, loose

or incorrect

wiring?

Refer to wiring

diagram.

No

Yes

3. Motor Overload Protector Cycles Repeatedly

20 70380601

4. Motor Runs But Cylinder Does Not Turn

Motor Runs But Cylinder

Does Not Turn

Machine Troubleshooting

Is cylinder

belt

broken?

No

Is cylinder

binding?

Yes

Replace

cylinder belt.

Check cylinder

for binding.

TMB1905S

70380601 21

Machine Troubleshooting

5. Motor Does Not Stop

Motor Does

switch or lint panel switch

not working

Not Stop

Is the door

properly?

No

Yes

Test switches and replace if

inoperative.

Is coin drop not working

properly?

No

Is wiring

incorrect?

No

Is electronic

control

inoperative?

No

Yes

Test coin drop

and replace if

inoperative.

Refer to wiring

diagram.

Replace

electronic

control.

Is motor

inoperative?

22 70380601

relay

Yes

Test relay and

replace if

inoperative.

TMB2038S

6. No Heat Condition (Non-CE and Non-Australian Models)

To re d uce th e r is k o f e l ec tri c s hoc k, fir e, ex p los io n , s er i ous i n ju r y o r d ea t h:

•Disconnect electric power to the tumble dryer before servicing.

•Close gas shut-off valve to gas tumble dryer before servicing.

•Close steam valve to steam tumble dryer before servicing.

•Never start the tumble dryer with any guards/panels removed.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the tumble dryer is properly grounded.

W002R1

WARNING

Ignition Control Module Function

There are four components to the ignition system: the module, the spark igniter, the high voltage cable and ground wire. When 24 VAC is applied between the TH and GND terminals on the module, the module will send the high voltage signal to the igniter and 24 VAC to the gas valve coils. Gas will hit the sparking igniter and flame will be established. The igniter being engulfed in flame will create a millivolt electric signal that is sent back to the module by the high voltage cable; this is what them module sees as flame recognition. If the millivolt signal is not at the module in ten seconds, the module will go into safety lockout. The voltage will be cut from the igniter and gas valve coils and will not be restored until voltage is cycled at the module.

Machine Troubleshooting

Intermittent Heat Test Procedure

On ignition control modules with date codes higher than 08t2, perform the following test.

Start the tumble dryer and run for 10 minutes (verify that the tumble dryer is heating properly). After the 10 minute cycle, re-start the tumble dryer and once again verify the unit is heating. Repeat this procedure 3 times. If the tumble dryer passes this test, the ignition control module is operating properly and SHOULD NOT be changed. Refer to Troubleshooting Manual for additional service procedures.

70380601 23

Machine Troubleshooting

Is the Ignition Control

Module’s red light on?

No

Yes

Refer to

Paragraph 7.

Replace igniter and high

voltage lead. Retest unit. If

unit still does not spark,

replace module.

No

Refer to Paragraph 7

for heat circuit

troubleshooting.

Is there

24 volts AC between

the TH and GND terminals

on the module?

Yes

No

Check wiring between gas valve and module.

If wiring is good,

replace module.

Yes

Is there continuity

between GND terminal on

module and machine?

No No

Does the igniter

spark but no

flame is produced?

No

Yes

Is there

24 volts AC at the gas

valve coils when igniter

is sparking?

Is the igniter

positioned properly

in the flame, and does the

flame look good?

Does the igniter

spark?

Verify that gas is supplied to the machine. If gas and

voltage are present,

replace gas valve or coils.

Does the flame turn

off after igniter

stops sparking?

No

Yes

Replace module.

Adjust position of igniter and retest.

Yes

Verify machine is

properly grounded.

Replace igniter and

high voltage lead.

Retest unit. If it still

does not sense flame,

replace module.

TMB2395S

6. No Heat Condition

24 70380601

7. Burner Does Not Ignite

Burner Does

Not Ignite

Is there

an improper or

inadequate exhaust

system?

No

Are there

blown fuses or

tripped circuit breakers

in external electric

supply line?

Yes

exhaust system

Yes

Refer to

Installation

Manual for

requirements.

Check fuses or

circuit breaker.

Is

stove limit

thermostat 2

inoperative?

No

Is

there an

insufficient gas

supply?

No

Machine Troubleshooting

Test thermostat 2

Yes

and replace if

inoperative.

Open partially closed gas shut-off valve, or

correct low gas

pressure. Check

manifold pressure

and adjust to

pressure specified on

serial plate. If

pressure cannot be

obtained, have your

local gas company

check main gas

pressure.

No

Is

drying

selector in the

“Cool Down”

portion of

cycle?

No

Is

the cabinet

thermostat

inoperative?

No

Is

stove limit

thermostat 1

inoperative?

Yes

Reset switch on microprocessor.

Test thermostat

and replace if

inoperative.

Test thermostat 1

and replace if

inoperative.

Are the orifices

incorrect?

No

Is there

lint

buildup?

No

Is there

inadequate

ductwork and

make-up

air?

Yes

Tumble Dryer is

equipped for type of

gas specified on

serial plate. If

orifices are different from that specified on serial

plate, obtain and

install correct orifices.

Clean lint

compartment. Check

damper for lint

accumulation. Check

ductwork for lint

buildup.

Refer to Installation

Manual to ensure that ductwork and

make-up air

openings are sized

accurately.

No

70380601 25

No

Continued on

Machine Troubleshooting

Continued from

there an

improper igniter

to burner

clearance?

Are valve coils

inoperative?

No

Clearance

should be

0.110 - 0.140

inch (2.79 - 3.55

mm).

Yes

Check valve

coils and replace if

necessary.

Yes

Is

there a

blown fuse on

tumble

dryer?

Yes

Check fuse

(located in

control box)

and replace if

necessary.

Is

gas shut-off

valve in the

closed

position?

Yes

Open shut-

off valve.

Is motor switch inoperative?

No

Replace IEI

control.

Yes

Replace motor.

Yes

Is the

IEI control

inoperative?

TMB2187S-b

Yes

Connect

ground wire

to ground

terminal.

Is the

ground wire

from Instant

Electronic Ignition

(IEI) board not

connected to

ground

terminal?

No

Is

there broken,

loose or incorrect

wiring?

Yes

Refer

to wiring

diagram.

Is the lint

panel not

closed

properly?

Yes

Unlock and open

lint panel. Close

panel ensuring a

tight fit, then lock.

Is the

airflow switch

inoperative?

Test switch

and replace

if inoperative.

Yes

No

Continued on

7. Burner Does Not Ignite (continued)

26 70380601

7. Burner Does Not Ignite (continued)

c

Continued from

Is there

an inoperative

microprocessor or

hybrid timer?

No

Is

wrong

transformer

configuration

harness

installed?

No

Is Instant

Electronic

Ignition (IEI)

control in safety

lockout?

Yes

Test and replace

as needed.

Check incoming

voltage and install

correct

configuration

harness.

Reset IEI control by

opening and closing

loading door. (Non-

CE models only)

Reset IEI by

pressing reset

button on back of

unit. (CE models

only)

70380601 27

TMB2187S-

Machine Troubleshooting

Burner Ignites and Goes Out

Repeatedly

Is there

insufficient

gas

pressure?

Check gas

supply and

pressure.

Yes

Is the

cabinet

thermostat

inoperative?

Yes

Test thermostat

and replace if

inoperative.

Is the

exhaust system

improper or

inadequate?

Yes

Refer to

Installation

Manual for

exhaust

system

requirements.

No

Does

tumble dryer have

improper

orifices?

Yes

Tumble Dryer is

equipped for

type of gas

specified on serial

plate. If orifices are

different from that

specified on serial

plate, obtain and

install correct

orifices.

No

Is there excessive igniter to burner

clearance?

Yes

Refer to

Paragraph 43.

Is

there inadequate

make-up air?

Yes

Refer to

Installation Manual for

make-up air

requirements.

No

Is the

thermistor

inoperative?

Yes

No

Replace

thermistor.

Is the control

heater relay

malfunctioning?

Yes

Replace control.

No

Is there

broken, loose

or incorrect

wiring?

Yes

Refer to wiring

diagram.

No

Yes

Repair damper to

working order.

Are the back

draft dampers

locked in close

position?

No

TMB1908S

No

8. Burner Ignites and Goes Out Repeatedly

28 70380601

9. Burner Does Not Shut Off

Burner Does Not Shut Off

Are there

impurities on gas

valve seat,

preventing valve

from closing?

Yes

Machine Troubleshooting

Replace gas

valve.

No

Is wiring correct?

No

Is control heater

relay

malfunctioning?

Yes

Refer to wiring

diagram.

Replace

control.

TMB1909S

70380601 29

Machine Troubleshooting

10. Clothes Do Not Dry

Clothes Do Not

Dry

Is there

enough heating

time allocated for

the load?

Yes

Start cycle again

with enough time to

dry load.

Does

the burner ignite

and go out

repeatedly?

No

Yes

Refer to

Paragraph 7.

No

Is the burner not

igniting?

No

Is there

too much water in

articles being

dried?

No

Is

the clothes

load too

large?

No

Yes

Refer to

Paragraph 6.

Remove excess

water.

Remove part of load. Maximum

load is 25 pound

dry weight (cotton

load) for 25 pound

tumble dryer, etc.

Is

the drying

selector

improperly

set?

No

Is

the voltage

incorrect?

No

Is there

inadequate

make-up

air?

No

Is the

exhaust duct to

the outside

blocked?

Yes

Set selector

for higher

setting.

Refer to Installation

Manual for electrical

requirements.

Refer to Installation

Manual for make-up

air requirements.

Yes

Clean duct to

remove blockage.

Is the

exhaust system

improper or

inadequate?

No

Yes

30 70380601

Refer to Installation

Manual for exhaust

system

requirements.

No

Continued on

10. Clothes Do Not Dry (continued)

Continued from

Is the lint screen

clogged?

No

Is the thermistor

inoperative?

No

Yes

Clean lint screen.

Replace thermistor.

Is the exhaust damper

binding?

No

Is the

cylinder speed

too fast?

No

Is airflow switch

bracket mounted

properly?

Yes

Adjust damper so it

turns freely.

Check belt is not

riding on outer

diameter of motor

pulley.

Check for proper

alignment: make

Yes

sure locator pins

are securely in

place and tighten

mounting screws.

70380601 31

TMB1910S-b

Machine Troubleshooting

11. Tumble Dryer Overheating

Tumble Dryer

Overheating

Does

tumble dryer

have incorrect

main burner

orifices?

No

Is gas

pressure too high or

low?

No

Is the

make-up air

inadequate?

No

Is there

lint buildup?

No

Is the

exhaust system

restricted or

inadequate?

No

Yes

Obtain and install

correct orifices.

Adjust gas pressure

as specified on

serial plate.

Refer to Installation

Manual for make-up

air requirements.

Clean lint

compartment. Check

damper for lint

accumulation. Check

ductwork for lint

buildup.

Remove obstruction

or lint build up from

exhaust ductwork.

Refer to Installation

Manual for exhaust

system

requirements.

Is the

thermistor

sensor

inoperative?

No

Is the exhaust damper

binding?

No

Is the

control heater

relay

malfunctioning?

No

Are

the safety

covers missing,

allowing

cool air to enter

tumble

dryer?

No

Is the

lint screen

clogged with

fabric

softener?

No

Are there

holes in cabinets

due to foreign

objects?

Yes

Ye s

Yes

Ye s

Check wiring to

ensure thermistor

is connected.

Replace

thermistor if

necessary.

Remove lint build-

up on thermistor.

Adjust damper

so it turns

freely.

Replace control.

Replace covers.

Replace lint

screen.

Repair/replace

cabinet

components.

32 70380601

TMB1911S

12. Burner Not Burning Properly

Burner Not Burning

Properly

Is there lint/dirt in

burner tube?

Is the gas

pressure too high

or low?

No

Disassemble

burner and

blow out the dirt.

Yes

Check serial plate on back of tumble dryer for

correct gas

pressure.

Yes

Is

the airflow

switch not

functioning

properly?

Yes

Replace airflow

switch.

Is there

inadequate

make-up

air?

Yes

Refer to Installation

Manual for make-up

air requirements.

TMB1912S

No

Yes

Clean off lint.

Is there lint buildup

around gas valve

spud?

No

Does the

tumble dryer have

incorrect

orifices?

Yes

Tumble Dryer is

equipped for the

type of gas specified

on serial plate. If

orifices are different

from that specified

on serial plate,

obtain and install

correct orifices.

Is the

exhaust duct

restricted or

blocked?

Yes

Disassemble

and clean

exhaust system.

No

Machine Troubleshooting

70380601 33

Machine Troubleshooting

Loading Door

Opens During

Operation

Is

tumble dryer

improperly

leveled?

Refer to Installation

Manual for leveling

leg adjustment.

Is clothes

load too

large?

Remove part of load and restart tumble dryer.

Is loading

door strike

adjusted

incorrectly?

Refer to

Adjustments

Section for strike

adjustment.

Yes

No

Yes

No

Yes

TMB1913S

13. Loading Door Opens During Operation

34 70380601

14. Cylinder Continues to Spin with Door Open

NOTE: All tumble dryer panels must be in place and on the machine for proper operation.

Cylinder

Continues To

Spin With Door

Open

Machine Troubleshooting

Is relay

inoperative?

Yes

Replace relay

in control box.

TMB1914S

70380601 35

Machine Troubleshooting

Coin Does Not Fall Into Coin Vault or Coin Drop Sensor Does Not

Register That Coin

Has Been Entered

Is proper electrical

power

supplied to

coin drop?

Incorrect electrical

connection may

prevent coins from

registering in coin drop.

Refer to wiring

diagram.

No

Is

machine

level?

Machines that are not

level may prevent coins

from following through required check stages

of drop. Refer to

Installation Manual

for instructions on

leveling machine.

Is coin

drop

clean?

Residue or lint build-up

may prevent coins from

following through

required check stages

of drop. Clean coin

drop.

Yes

No

Yes

No

TMB1915S

Is sensor

operative?

Yes

Replace coin drop

sensor.

No

15. Coin Does Not Fall into Coin Vault or Coin Drop Sensor Does Not Register that Coin Has Been Entered

IMPORTANT: Never use oil to correct coin drop problem. Oil residue will prevent coins from rolling properly.

IMPORTANT: Do not bend or damage mechanical parts within coin drop.

36 70380601

Machine Troubleshooting

MIX7B

Coin Drop Cover

Coin Return Button

Tension Spring

MIX6B

Coin Drop Cover

DRY2088N

Cover Catch

Tension Spring

Small Flathead Screwdriver

Right Side of Tension Spring

Left Tab

MIX3B

Tabs

Center Tab

Troubleshooting Coin Drop

If coin drop is not accepting coins, perform the following:

1. Clean coin drop. Refer to Paragraph 23.

2. On electronic coin drops with an old-style tension spring (shown in Figure 3 and Figure 5), test and replace tension spring using the following instructions.

Remove Coin Drop From Machine

1. Disconnect electrical power to machine and drop.

2. Remove coin drop from machine.

Test Te ns io n Spr ing

1. Push coin return button to open and close coin drop cover to clear possible coin jams. Refer to Figure 3.

Replace Tension Spring

1. Move tension spring downward until cover catch is free. Refer to Figure 5.

Figure 5

2. Open cover for coin drop.

3. Place a small flathead screwdriver under right side of tension spring and lift up. Refer to Figure 6.

Figure 3

2. Manually hold down coin drop cover and insert coin. Refer to Figure 4.

Figure 4

3. If coin drop now operates properly, replace tension spring using instructions on following pages.

MIX2B

Figure 6

4. Use screwdriver to move spring approximately 3 mm to left.

5. Lift spring over left tab. Refer to Figure 6.

6. Rotate spring clockwise, 40 to 60 degrees, until it is free from right tabs. Refer to Figure 7.

70380601 37

Figure 7

Machine Troubleshooting

MIX4B

Clip

MIX8B

Slot

MIX5B

Small Flat

Screwdriver

Center

Tab

Left Tab

7. Use screwdriver to remove spring from center tab. Refer to Figure 7.

8. Lift spring, with attached clip, off drop.

9. Remove clip from spring. Refer to Figure 8.

Figure 8

10. Attach clip to new tension spring, Part No. 209/ 00598/02.

11. Place clip, installed on spring, in slot on coin drop. Refer to Figure 9.

13. Lift spring gently to place in position under left tab.

14. Push spring to right until it snaps into position. Refer to Figure 6.

15. Close coin drop cover.

16. Move tension spring over cover catch. Refer to Figure 5.

Reinstall Coin Drop Into Machine

1. Reinstall coin drop into machine.

2. Reconnect electrical power to machine and drop.

3. Add a coin to drop to verify that coin drop is operating properly and that electrical connection is working properly.

Figure 9

12. Use a small flathead screwdriver to push spring under center tab. Refer to Figure 10.

Figure 10

38 70380601

Machine Troubleshooting

16. Cylinder Is “Stained”

Over time, the cylinder and cylinder backs of tumble dryers can become “stained” from various melted fabrics. These discolored areas can be removed by scrubbing the inside of the cylinder with cleaner and a cleaning pad, such as Scotch- Brite®.

IMPORTANT: Do not use a steel wool pad to clean the cylinder. Steel wool can damage your machine.

Galvanized Cylinders

For galvanized cylinders, use an all-purpose cleaner (such as 409®) and a cleaning pad (such as ScotchBrite®) to clean the inside of the cylinder.

1. Spray the cleaner on the discolored areas and let soak for a few minutes.

2. Using the pad, scrub the areas until the discoloration is removed.

3. Repeat steps 1-2 as necessary.

4. Thoroughly wipe the entire cylinder after cleaning to insure the cleaner has been removed.

Stainless Steel Cylinders

For stainless steel cylinders, use a heavy duty powder cleanser (such as Zud®) and a cleaning pad (such as Scotch- Brite®) to clean the inside of the cylinder.

1. Using a water spray bottle, wet the cylinder and cylinder back.

2. Sprinkle cleanser onto the pad and scrub the discolored areas.

3. Repeat steps 1-2 as necessary.

4. Thoroughly wipe the entire cylinder after cleaning to insure the cleanser has been removed.

70380601 39

Section 4

Fire Supression System Troubleshooting

A water discharge or system fault is indicated when the fire suppression system control box light is on.

IMPORTANT: When handling electronic controls, use a ground wrist strap. Due to the sensitivity of electronic controls, careful handling is required. Wrist strap, cord and alligator clip are designed to carry away any electrostatic charge from your body and to direct charge to an available ground. By using this static protection device, potential electrostatic discharge problems associated with handling of electronic control will be minimized. Always handle electronic control by its metal edges.

40 70380601

Fire Supression System Troubleshooting

To re d uc e t h e r is k o f e l ec tri c s hoc k, fi r e, ex p lo s ion , s er i ou s i n ju ry or de a th:

•Disconnect electric power to the tumble dryer before servicing.

•Close gas shut-off valve to gas tumble dryer before servicing.

• Close steam valve to steam tumble dryer before servicing.

•Never start the tumble dryer with any guards/panels removed.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the tumble dryer is properly grounded.

W002R1

WARNING

TMB2196N

17. Tumble Dryer Does Not Operate and Light Is On

Are there signs of

fire or water

discharge?

No

Does tumble dryer

operate after

pressing the reset

button for at least

one second?

No

Is there power

(5 Volts DC) between

H2-3 and H2-4 of the reset button?

Yes

Replace reset

button.

Yes

Was there a fire?

Replace tumble dryer.

No

Yes

Call the fire department.

DO NOT disconnect electric power to the tumble dryer. DO NOT disconnect water to the tumble dryer. DO NOT touch the tumble dryer.

Yes

No

Retest.

(Extreme cold

weather will cause a

system shutdown.)

Disconnect

power to

tumble dryer.

Run a

continuity test

across the reset switch. Is it shorted?

Yes

Replace

switch.

Refer to

Water Discharge

No Fire flowchart.

Replace fire

suppression

system

control

board.

Reset fire

suppression

system control.

Retest.

Is the resistance for

both temperature

sensors within the

acceptable range?* Sensor 1 H4-1 to H4-2 Sensor 2 H4-4 to H4-3

No

Replace

temperature

sensors.

Replace fire

Yes

suppression

system

control board.

Acceptable resistance ranges from

*

150K Ohms to 19K Ohms in temperature ranges from 40° to 120° F (4° to 48° C).

Retest.

Reset fire

suppression

system control.

Retest.

70380601 41

TMB2196N

Fire Supression System Troubleshooting

To re d uc e t h e r is k o f e l ec tri c s hoc k, fi r e, ex p lo s ion , s er i ou s i n ju ry or de a th:

•Disconnect electric power to the tumble dryer before servicing.

•Close gas shut-off valve to gas tumble dryer before servicing.

• Close steam valve to steam tumble dryer before servicing.

•Never start the tumble dryer with any guards/panels removed.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the tumble dryer is properly grounded.

W002R1

WARNING

TMB2258N

Is the resistance for

both temperature

sensors within the

acceptable range?* Sensor 1 H4-1 to H4-2 Sensor 2 H4-4 to H4-3

Replace fire

suppression

system

control board.

Yes

Acceptable resistance ranges from 150K Ohms to 19K Ohms in temperature ranges from 40˚ to 120˚ F (4˚ to 48˚ C).

Reset fire

suppression

system control.

Retest.

Replace

temperature

sensors.

No

Retest.

*

Is the unit

a reversing

model?

No

Yes

Set

control

to

nonreversing.

Electric Models:

Set to no heat.

Start unit.

Is the

cylinder

turning

clockwise?

Is the vent blocked or restricted?

Clear vent/ease

restrictions.

Refer to

Installation Manual for

proper venting.

Retest

system.

Retest

system.

Correct input

wiring to

change phase.

(Fan is

spinning

backward.)

Yes

Yes No

No

TMB2258N

18. Water Discharge, but No Fire

IMPORTANT: Electric Models: If water has discharged into machine, you MUST perform this diagnostic test with NO HEAT to the machine.

42 70380601

Fire Supression System Troubleshooting

To re d uc e t h e r is k o f e l ec tri c s hoc k, fi r e, ex p lo s ion , s er i ou s i n ju ry or de a th:

•Disconnect electric power to the tumble dryer before servicing.

•Close gas shut-off valve to gas tumble dryer before servicing.

• Close steam valve to steam tumble dryer before servicing.

•Never start the tumble dryer with any guards/panels removed.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the tumble dryer is properly grounded.

W002R1

WARNING

TMB2198N

Is voltage to fire

suppression system

control 24 VAC

between

H1-7 and H1-1?

Is fuse F1 on fire

suppression system

control blown?

Is voltage to light

2 VDC between

H2-1 and H2-2?

Replace light.

Yes

Replace fire

suppression system

control board.

No

Reset fire

suppression

system

control board.

Retest

Check power

to tumble dryer

and

connections

to junction

box.

No

Yes

Replace fuse. Retest fuse.

Yes

No

Retest

TMB2198N

19. Tumble Dryer Does Not Operate and Light Is Off

70380601 43

Fire Supression System Troubleshooting

To re d uc e t h e r is k o f e l ec tri c s hoc k, fi r e, ex p lo s ion , s er i ou s i n ju ry or de a th:

•Disconnect electric power to the tumble dryer before servicing.

•Close gas shut-off valve to gas tumble dryer before servicing.

• Close steam valve to steam tumble dryer before servicing.

•Never start the tumble dryer with any guards/panels removed.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the tumble dryer is properly grounded.

W002R1

WARNING

TMB2199N

20. Tumble Dryer Operates, but Water Does Not Discharge and Light Is On

Verify water is

supplied to valve at

the proper pressure

and flow rate. Refer

to Installation

section.

Yes

Turn off t umble dr yer.

Are water inlet

screens clogged?

No

Reset fire

suppression

system control.

Retest

Using an AC

voltmeter, within 90

seconds, is there

voltage to the water

manifold valve?

No

Is wiring between

valve and fire

suppression system

control good?

Yes

Replace fire

suppression system

control.

No

requirements of

Yes

screens, then turn on water.

Yes

No

Make

corrections to

meet water

system.

Clean inlet

Disconnect

hose from

water valve

outlet.

Correct wiring.

Refer to wiring diagram on the following page.

suppression

Retest

Reset fire

system control.

Reset fire

system control.

Are water hoses

or the manifold

nozzle clogged?

suppression system

Does water

come out of

valve?

Yes

Clear any

debris.

Reset fire

control.

Retest

No

Replace water

valve.

Retest

44 70380601

TMB2199N

Fire Supression System Troubleshooting

FIRE

SUPPRESSION

SYSTEM

CONTROL

BOARD

TMB2200N

70380601 45

Section 5

To re d uc e th e r is k o f e l ec tri c s h oc k, fir e, exp lo s ion , s er i ou s i n ju ry or dea th:

•Disconnect electric power to the tumble dryer before servicing.

•Close gas shut-off valve to gas tumble dryer before servicing.

•Close steam valve to steam tumble dryer before servicing.

•Never start the tumble dryer with any guards/panels removed.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the tumble dryer is properly grounded.

W002R1

WARNING

Adjustments

21. Loading Door Switch

The door switch should be adjusted so the cylinder stops when door is opened 2 inches (51 mm), plus or minus 1/4 inch (6 mm). The switch is normally open and is closed when the door is closed. If adjustment is needed, proceed as follows: Refer to Figure 11.

a. Close door and start tumble dryer. Slowly

open loading door. Cylinder and heat system should shut off when door is open 2 inches (51 mm), plus or minus 1/4 inch (6 mm).

b. Slowly close loading door. When door is 2

inches or less from being fully closed, the switch actuator on the door should contact the switch plunger and depress it enough to close the switch with an audible “click”.

c. If switch actuator does not depress the switch

plunger enough to operate the switch, bend switch actuator OUTWARD and repeat steps “a” and “b”.

22. Loading Door Strike

Refer to Figure 11.

The door strike must be adjusted so that sufficient tension holds loading door closed against the force of a load tumbling against it. The door is properly adjusted when 8-15 lbs. (3.60-6.75 kg) of pull is required to open door.

If adjustment is needed, follow these steps:

a. Open loading door. b. Loosen jamnut. c. Turn door strike screw in or out as required. d. Retighten jamnut.

Loading

Door

Switch

Actuator

Figure 11

Jamnut

Door Strike

Screw

T280SE3C

46 70380601

23. Aligning Door Strike

DRY208

Catch

Spring

Cover

Spring

If the door acorn nut is breaking or the door catch is prematurely wearing (refer to Figure 11), a door adjustment may be necessary to align the two striking surfaces.

a. Visually check door strike to catch position to

determine if door is striking low or high.

b. Make sure the door frame to the tumble dryer

hinge mounting screws are secure.

c. To adjust the strike position slightly, loosen

both hinge hex bolts until the door frame can be moved. If the door is striking low, lift up on the door and while maintaining pressure tighten both hinge bolts. If the door is striking high, push down on the door and while maintaing pressure tighten both hinge bolts. Re-check strike position and repeat until position is correct.

Open cover for coin drop. Refer to

(2)

Figure 13.

Adjustments

DRY2089N

24. Cleaning Coin Drop

NOTE: The coin drop should be cleaned once a year. Clean the drop more often if it is exposed to high levels of residue or lint build-up.

a. Disconnect electrical power to machine and

drop. b. Remove coin drop from machine. c. Check the spring style of coin drop.

Coin Drops with Old-Style Spring (refer to

Figure 12):

(1) Move spring downward until cover catch is

free. Refer to Figure 12.

NOTE: Do not lift or overbend the spring in any direction.

Figure 13

Coin Drops with New-Style Spring (refer to Figure 14):

DRY2404N

Figure 14

(3) Open cover of coin drop. Refer to

Figure 15.

Figure 12

70380601 47

DRY2088N

Adjustments

Spring

DRY2090N

Old-Style Spring Coin Drop

New-Style Spring Coin Drop

Alcohol

Moistened

Cloth

NOTE: Do not overbend the spring by opening cover too far.

DRY2405N

DRY2408N

Figure 15

d. Clean the coin path with a soft brush and wipe

exposed surfaces with an alcohol moistened

cloth. Refer to Figure 16 or Figure 17.

DRY2090N

DRY2405N

Figure 17

e. Clean residue from coin rail with an alcohol

moistened cloth. Refer to Figure 18.

DRY2406N

Figure 18

Figure 16

48 70380601

f. Clean light sensors with a soft brush or air

Light

Sensors

spray duster. Refer to Figure 19.

DRY2407N

Figure 19

Adjustments

g. Close cover for coin drop. h. Coin Drops with OLD-Style Spring - Move

spring back over cover catch. i. Reinstall coin drop into machine. j. Reconnect electrical power to machine and

drop. k. Add a coin to drop to verify that coin drop is

operating properly and that electrical

connection is working properly.

70380601 49

Section 6

To re d uc e th e r is k o f e l ec tri c s h oc k, fir e, exp lo s ion , s er i ou s i n ju ry or dea th:

•Disconnect electric power to the tumble dryer before servicing.

•Close gas shut-off valve to gas tumble dryer before servicing.

•Close steam valve to steam tumble dryer before servicing.

•Never start the tumble dryer with any guards/panels removed.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the tumble dryer is properly grounded.

W002R1

WARNING

Does the display on

the

electronic control

increment properly?

Is connector H2 on the

control firmly seated in

its receptacle?

Are wires exiting coi

n drop optical sensor cracked or broken?

Exit diagnostic

testing and reset

control. (Prompting

for vend price)

Reconnect and run

diagnostic test

again.

Reconnect and run

diagnostic test

again.

Replace coin drop

or optic switch.

Replace coin drop.

If problem still exists

then replace the

electronic control.

Start coin drop

diagnostic tests.

YES

NO

YES

NO

YES

NO

Gas and electric hea

t.

Single and three pha

se

power suppl

y.

TMB1978S

Is the 3 pin connector

between coin drop an

d

control connected

correctly?

Micro Display Control (MDC)

Troubleshooting

Models with BC, BL, BX and BY Control Suffixes

25. Coins Ignored When Entered

50 70380601

26. Control Has No Display

Control has no display

Is there voltage across

H1-1 & H1-3 on

the control?

Replace electronic

control.

Is there power supplied

to the unit?

NO

Is there voltage at input

of primary fuses?

Is there voltage at

output side o

f the

primary fuses?

Is there voltage across

terminals 1 & 2 of

transformer primary?

Plug unit in and run

it.

Correct wiring

between primary

fuse and power

supply.

Replace primary

fuse(s).

Correct wiring

between primary

fuse and

transformer.

Is there voltage across

terminals 1 &

4 of transformer

secondary?

Replace

transformer.

Is there voltage at

the input of the

secondary fuse?

Is there voltage at

output side o

f

secondary fuse?

Correct wiring

between secondary

fuse and

transformer.

Replace secondary

fuse.

Correct wiring

between control and

secondary fuse.

YES

NO

YES

(1)

(2)

(3)

(4)

(5)

(6)

(7)

TMB1979S

Gas, steam and elect

ric heat.

Single and three pha

se power suppl

y.

Micro Display Control (MDC) Troubleshooting

70380601 51

Micro Display Control (MDC) Troubleshooting

Control Has No Display

BLK

THERMISTOR

WHT

BLK

THERMISTOR

WHT

025 & 030 MODELS 035 & 055 MODELS

1

WHT/BLU

TMB2213S

12345678910

N.C.

ORG/BRN

FS-1

N.O.

COM

AIR FLOW

H3-1 & H3-2

START PULSE INPUT

SWITCH

H11L1

Iin= 3-30ma

TIME 20msec MIN.

AVAILABLE OUTPUT

4N25

MACHINE RUNNING

H3-3 & H3-4

Vmax=28Vdc

OPTO OFF WHEN

24Vac

WHT/VLT

100 OHM

Imax=5ma

24Vac Ret

21

1/4 watt

3

4

5

H3

6

7

H6

123 45 6

H1-4

H1-2

LIMIT

CABINET

THERMOSTAT

SEE VEND

APPLICATION DETAIL

H4

CHASSIS GROUND

GRN/YEL

1

897 45623

TEMP. REGULATING

10

H4

H1-3

H1-1

RED

H2-6

Door Sense Ret

HEAT RELAY

CIRCUIT CONTROLS

24Vac Ret

24VAC

CONTROL

POWER

SUPPLY

BRN/RED

WHT

H2-4

H2-3

LINT

DOOR

FS-2

PANEL

SWITCH

RED/WHT

RED/BLK

N.O.

RED/WHT

COM COM

N.O.

HEAT RELAY

H5

COIN DROPS

5123864111097 12

DOOR SENSING CIRCUIT ALLOWS

RELAY ONLY WHEN DOOR IS

CLOSED & SWITCH IS PRESSED

CONTROL TO TURN ON MOTOR

MDC CONTROL

JUMPER H2-2 TO H2-5 AS FOLLOWS:

240Vac - 13.6K ohm 10 watt

VOLTAGE CONFIGURATION INPUT

24Vac - WIRE JUMPER

120Vac - 6.8K ohm 5 watt

H2-5

5

RED

H2-2

RED/BLK

MOTOR RELAY

H2-1

RED/BLK

RED

3

2

FUSE

PRIMARY

BLK

N

L1

TB1

SERVICE

52 70380601

L2

ONNECTION

LT. BLU

AGC-2A

250V

2

120V

1

BLK

4

1

1.5A

24V

3

24V

3.5A

2

4

FUSE

250V

1.25 T

SECONDARY

WHT

RED

6

FUSE

250V

MDL-3.5A

SECONDARY

RED/BLU

RED

7

27. Door Open Indicator

Is there voltage at

H2-1 on the Electronic

control?

Replace Control.

Is there power supplied

to the unit?

NO

Is there voltage at input

of primary fuses?

Is there voltage at output side of the

primary fuses?

Is there voltage across

terminals 1 & 2 of

transformer primary?

Plug unit in and run

it.

Correct wiring between primary fuses and power

suppl

y.

Replace primary

fuse(s).

Correct wiring between primary

fuses and

transformer.

Replace

transformer.

Is there voltage at

the input of the

secondary fuse?

Is there voltage at

output side of

secondary fuse?

Correct wiring

between secondary

fuse and

transformer.

Replace secondary

fuse.

NO

YES

Is there voltage at

N.O. of door

switch?

Is there voltage at

N.O. of lint panel

switch?

Check for proper

operation replace if

necessary

.

Correct wiring between N.O. on lint panel and COM on

door switch.

Correct wiring

between N.O. and

output of secondary

fuse.

Check for proper

function of door

switch replace if

necessary

.

Correct wiring

between H2-1 of

electronic control

and COM of lint

panel switch.

YES

NO

Gas, steam and electric heat.

Single and three phase

Reference voltage

checks to transformer

neutral.

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

TMB2039S

Is there voltage across

terminals 2 & 3 of

transformer secondary?

Is there voltage at

COM of lint panel

switch with lint

panel closed?

With door closed is

there voltage to

COM of door

switch?

Micro Display Control (MDC) Troubleshooting

70380601 53

Micro Display Control (MDC) Troubleshooting

Door Open Indicator

BLK

THERMISTOR

WHT

BLK

THERMISTOR

WHT

025 & 030 MODELS 035 & 055 MODELS

1

RED

WHT/BLU

12345678910

N.C.

COM

ORG/BRN

FS-1

N.O.

SWITCH

AIR FLOW

H3-1 & H3-2

Iin= 3-30ma

TIME 20msec MIN.

START PULSE INPUT

H11L1

4N25

MACHINE RUNNING

H3-3 & H3-4

Vmax=28Vdc

OPTO OFF WHEN

AVAILABLE OUTPUT

24Vac

WHT/VLT

100 OHM

Imax=5ma

24Vac Ret

21

1/4 watt

3

4

5

H3

6

7

H6

123 45 6

H1-4

H1-2

LIMIT

CABINET

THERMOSTAT

SEE VEND

APPLICATION DETAIL

BRN/RED

H4

H2-6

Door Sense Ret

24Vac Ret

24VAC

WHT

H2-4

H2-3

CHASSIS GROUND

GRN/YEL

1

HEAT RELAY

897 45623

TEMP. REGULATING

CIRCUIT CONTROLS

10

H4

H1-3

H1-1

CONTROL

POWER

SUPPLY

TMB2214S

LINT

PANEL

DOOR

FS-2

RED/BLK

SWITCH

RED/WHT

SWITCH

RED/WHT

HEAT RELAY

N.O.

COM COM

N.O.

COIN DROPS

H5

512386411109712

RED

10

9

MOTOR RELAY

H2-1

RED/BLK

11

RED/BLU

8

DOOR SENSING CIRCUIT ALLOWS

RELAY ONLY WHEN DOOR IS

CLOSED & SWITCH IS PRESSED

CONTROL TO TURN ON MOTOR

MDC CONTROL

VOLTAGE CONFIGURATION INPUT

24Vac - WIRE JUMPER

120Vac - 6.8K ohm 5 watt

JUMPER H2-2 TO H2-5 AS FOLLOWS:

240Vac - 13.6K ohm 10 watt

FUSE

1.25 T

250V

MDL-3.5A

H2-2

RED/BLK

250V

RED

7

H2-5

5

RED

4

2

LT. BLU

3

2

N

L1

TB1

SERVICE

L2

CONNECTION

54 70380601

FUSE

250V

AGC-2A

PRIMARY

BLK

120V

1

BLK

4

1

1.5A

24V

3

24V

3.5A

2

SECONDARY

WHT

RED

FUSE

6

SECONDARY

28. Motor Will Not Start/Run

Is there voltage across

H2-1 and H2-6 on

the electronic control ?

YES

Replace MDC

control.

Is there voltage

across H2-4 and H2-6

on the electronic control?

Is there voltage at

terminal 5 of the

motor control relay?

Is there voltage at

terminal 8 of motor

control relay?

Is there voltage across

terminals 1 & 4 of

the fan motor?

Does the fan motor

run?

Is there voltage at

terminal 6 of motor

control relay?

Is there voltage at

terminal 9 of motor

control relay?

Replace

control.

Correct wiring

between terminal 5

and power suppl

y.

Replace motor

control rela

y.

Correct wiring

between fan motor

and motor control

relay.

Replace fan motor.

Correct wiring

between terminal 6

of motor control

relay and suppl

y.

Replace motor

control rela

y.

NO

YES

NO

YES

NO

Note: test conducted with ven

d

price satisfied and start button

pressed.

Correct wiring

between L1, L2 and

power suppl

y.

Replace motor

control rela

y.

Is the unit equipped with single phase or three phase power?

Is there supply voltage

to L1 and L2 of the motor control relay?

Is there votlage across

L1 &

T1 and L2 &

T2?

Single phase

NO

YES

NO

3 phase.

Also

see Note on

Is there supply voltage

between L2 & L3 of

motor control relay?

Three phase. Also

see Note on next

page.

NO

YES

Is there voltage across

terminals L2 &

T2 and

L3 &

T3?

Correct wiring

between L2, L3 and

supply.

Replace motor

control rela

y.

YES

NO

Single phase

NO

Refer to Door

Open Indicator

flowchart.

(1)

Is there voltage across the coil of the motor control

relay?

Correct wiring to coil

of motor relay .

(2)

YES

NO

(3)

(4)

(5)

(6)

(7)

(8)

(10)

(11)

(12)

(13)

Gas, electric and st

eam heat.

Single and three ph

ase power suppl

y.

TMB1982S

Micro Display Control (MDC) Troubleshooting

70380601 55

Micro Display Control (MDC) Troubleshooting

Is there voltage across

terminals 1 & 4 of

cylinder motor?

Does the cylinder

motor run?

Correct wiring between cylinder motor and motor

control rela

y.

Replace cylinder

motor.

NO

YES

Motors are

operational.

Note: For high voltage three

phase supply (380 volts

or higher), the cylinder and

fan motors are supplied

by L1, L2, L3 through the motor relay te

rminals

T1,

T2,

T3. Make the appropriate adjustments when

doing voltage checks.

(9)

TMB1982S

28. Motor Will Not Start/Run (continued)

Please see following 2 pages for wiring diagram information.

56 70380601

Micro Display Control (MDC) Troubleshooting

Motor Will Not Start/Run (Sheet 1 of 2)

TB1-N

4

BLK/RED

8

BLK/RED

6

LT. BLU

5

BLK

5

CYLINDER

M

MOTOR

9

FAN

M

8

THERMISTOR

025 & 030 MODELS 035 & 055 MODELS

1

MOTOR

WHT

WHT/BLU

AUX

MAIN 2

MAIN 1

THERM

PROT.

RUN

1

BLU/BLK

4

5

AUX

MAIN 2

MAIN 1

THERM

PROT.

RUN

3

1

GRY/BLK

BLK

12345678910

WHT

H4

CHASSIS GROUND

GRN/YEL

BLK

1

HEAT RELAY

897 45623

TEMP. REGULATING

CIRCUIT CONTROLS

10

H4

H1-3

H1-1

CONTROL

POWER

SUPPLY

RED

WHT

H2-6

24Vac Ret

24VAC

3

2

H2-3

Door Sense Ret

6 9

BA

WHT

H2-4

WHT

M

BRN/RED

M

N.C.

FS-1

BRN

WHT/

WHT

ORG/

ORG BRN

ORG/BRN

5

3

FAN MOTOR

CENTRIFUGAL

4

7

N.O.

COM

AIR FLOW

H3-1 & H3-2

START PULSE INPUT

SWITCH

BRN/WHT

SWITCH

H11L1

Iin= 3-30ma

TIME 20msec MIN.

AVAILABLE OUTPUT

H3-3 & H3-4

4N25

MACHINE RUNNING

Vmax=28Vdc

OPTO OFF WHEN

24Vac

IGN

WHT/VLT

Imax=5ma

24Vac Ret

WHT

GND

100 OHM

21

1/4 watt

3

4

5

H3

6

7

H6

123 45 6

H1-4

H1-2

FIRST COIL

GAS VALVE

SECOND COIL

WHT

3

GND

TH

2

VLT/WHT

STOVE

VLT

CABINET

ICM

LIMIT

THERMOSTAT

LIMIT

THERMOSTAT

GND

VALV

WHT/

4

GRN/YEL

BLK

1

SEE VEND

APPLICATION DETAIL

TB1-L1

7

SERVICE

208-240V

120V

SERVICE

TB1-L2

4

TMB2215S

70380601 57

MDC CONTROL

HEAT RELAY

CONTROL TO TURN ON MOTOR

DOOR SENSING CIRCUIT ALLOWS

RELAY ONLY WHEN DOOR IS

CLOSED & SWITCH IS PRESSED

JUMPER H2-2 TO H2-5 AS FOLLOWS:

240Vac - 13.6K ohm 10 watt

VOLTAGE CONFIGURATION INPUT

24Vac - WIRE JUMPER

120Vac - 6.8K ohm 5 watt

H2-5

RED/BLK

MOTOR RELAY

H2-1

RED/BLK

FS-2

RED/BLK

H2-2

H5

COIN DROPS

5123864111097 12

Micro Display Control (MDC) Troubleshooting

Motor Will Not Start (Sheet 2 of 2)

LT. BLU

4

AUX

MAIN 2

THERM

RUN

5

3

025 & 030 MODELS 035 & 055 MODELS

1

BLU/BLK

LT. BLU

4

AUX

MAIN 2

THERM

RUN

1

GRY/BLK

BLK

THERMISTOR

WHT

H4

BLK

THERMISTOR

WHT

H4

RED

WHT/BLU

12

13

TB1-L1

TB1-L2

TB1-L3

BLK/RED

L3

MM

BLK/WHT

L2

M

BLK

L1

T1 T2 T3

10

11

MAIN 1

PROT.

MAIN 1

PROT.

12345678910

CHASSIS GROUND

GRN/YEL

3241

5

HEAT RELAY

TEMP. REGULATING

CIRCUIT CONTROLS

9

10 678

H1-3

H1-1

SUPPLY

CONTROL

POWER

CYLINDER

MOTOR

FAN

WHT

2

WHT

H2-3

H2-6

Door Sense Ret

24Vac Ret

24VAC

69

WHT

5

3

BRN

SWITCH

WHT/

FAN MOTOR

CENTRIFUGAL

WHT

ORG/

WHT

13

3

M

14

M

ORG BRN

N.C.

N.O.

BRN/RED

COM

SWITCH

AIR FLOW

ORG/BRN

H2-4

FS-1

START PULSE INPUT

TIME 20msec MIN.

Iin= 3-30ma

H3-1 & H3-2

BRN/WHT

H11L1

AVAILABLE OUTPUT

OPTO OFF WHEN

H3-3 & H3-4

4N25

MACHINE RUNNING

Vmax=28Vdc

Imax=5ma

24Vac Ret

24Vac

HC1

HC2

VLT/WHT

LIMIT

STOVE

THERMOSTAT

VLT

LIMIT

WHT/VLT

CABINET

THERMOSTAT

12

100 OHM

1/4 watt

3

4

5

H3

6

7

3

H6

21654

H1-4

H1-2

SEE VEND

APPLICATION DETAIL

TMB2216S

WHT

BLK/

BLK

TB1-L2

TB1-L3

L3

L2

TB1-L1

58 70380601

WHT

2

BLK/

250V

FUSES

AGC-2A

PRIMARY

1

BLK

H3

T3

HC1

T2

HC2

SEE

JUMPER

12 34 5 6

TRANSFORMER

CONFIGURATION

HEAT RELAY

MOTOR RELAY

CLOSED & SWITCH IS PRESSED

RELAY ONLY WHEN DOOR IS

CONTROL TO TURN ON MOTOR

DOOR SENSING CIRCUIT ALLOWS

MDC CONTROL

120Vac - 6.8K ohm 5 watt

24Vac - WIRE JUMPER

240Vac - 13.6K ohm 10 watt

JUMPER H2-2 TO H2-5 AS FOLLOWS:

VOLTAGE CONFIGURATION INPUT

H2-1

H2-5

RED

4

1.5A

24V

1

3

4.0A

24V

2

H5

H2-2

RED/BLK

RED

250V

FUSE

1.25 T

SECONDARY

WHT

RED

FUSE

250V

MDL-3.5A

SECONDARY

FS-2

RED/BLK

LINT

PANEL

SWITCH

N.O.

RED/BLU

RED/WHT

COM COM

DOOR

SWITCH

RED/WHT

N.O.

RED

74 6 8 129 10 11

H5

COIN DROPS

3215

29. Unit Will Not Heat – Gas

Note: Tests are conducted with unit running

and calling for heat.

All voltage checks are referenced to

transformer neutral.

Correct wiring

between FS-2 and

COM of lint drawer.

Is there voltage at

FS-2 of MDC control?

Is there voltage

at FS-1 of MDC

control?

Correct wiring

between COM of

airflow sw

itch and

FS-1 of MDC

control.

Is there voltage at COM

of airflow switch?

Check for proper

function of airflow

switch and replace if

necessary.

Is there voltage across

COM & N.C. termin

al

of airflow switch?

Correct wiring

between terminal 7

on motor control

relay and N.C.

terminal on airflow

switch.

Is there voltage at

terminal 7 of motor

control rel

ay?

Replace motor

control relay.

Is there voltage across

terminals 7 & 4 of

motor control relay?

Correct wiring

between terminal 3

of fan motor centrifugal switch and terminal 4 of

motor control relay.

Is there voltage at

terminal 3 of fan

motor centrifugal

switch?

Replace fan moto

r.

Is there voltage across

terminals 3 & 5 of fan motor

centrifugal switch?

Correct wiring

between cabinet

limit and terminal 5

of fan motor

centrifugal switch.

Is there voltage to the

input side of the

cabinet li

mit?

Replace cabinet

limit.

Is there voltage across

cabinet limit?

Correct wiring

between stove limit 1

and cabinet limi

t.

Is there voltage to the input side of the stove

limit?

NO

YES

Is the

thermistor

operational?

Replace MDC

control.

Replace

thermistor.

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

TMB1985S

Micro Display Control (MDC) Troubleshooting

70380601 59

Micro Display Control (MDC) Troubleshooting

Replace the stove

limit.

Is there voltage across

the stove limit 1?

NO

YES

(12)

TMB1985S

(13)

Correct wiring

between stove lim

it 1

and stove limit 2.

Is there voltage to

input side of

stove limit 2?

Replace stove limit 2.

NO

YES

NO

YES

(14)

Is there

voltage

across stove limit 2?

Correct wiring

between terminal 2

of ICM and stove

limit 2.

Is there voltage to

terminal 2 of

the Ignition Control

Module (ICM)?

Replace ICM board.

Is there voltage at

terminal 1 of

ICM

board?

Correct wiring

between gas val

ve

and ICM board.

Is there voltage acr

oss

the coils of the gas

valve?

NO

YES

NO

YES

NO

YES

(16)

(15)

(17)

Note: Make sure unit is

not in a lock out

condition.

Replace gas valve

coils or complete

gas valve.

Is there gas flow

through the gas

valve?

Replace high voltage ignition cable or igniter.

Does the igniter spark?

YES

NO

YES

NO

YES

Unit operational.

Is there a flame?

YES

NO

29. Unit Will Not Heat – Gas (continued)

Please see following page for wiring diagram information.

60 70380601

Micro Display Control (MDC) Troubleshooting

Unit Will Not Heat – Gas

TMB2217S

16

7

6

5

4

1

3

9

8

14

10

2

15

12

17

13

11

70380601 61

Micro Display Control (MDC) Troubleshooting

Note: Tests are conducted with unit

running

and calling for heat.

All voltage checks are refere

nced to

transformer neutral.

Correct wiring between FS-2 and COM of lint panel.

Is there voltage on

FS-2 of MDC control?

Is there voltage

on FS-1 of

MDC control?

Correct wiring

between COM of

airflow switch and

FS-1 of MDC

control.

Is there voltage on

COM of airflow

switch?

Check for proper

function of airflow

switch and replace if

necessar

y.

Is there voltage across

COM & N.C. terminal

of airflow switch?

Correct wiring between terminal 7

on motor control

relay and N.C.

terminal on airflow

switch.

Is there voltage on

terminal 7 of motor

control relay?

Replace motor

control relay.

Is there voltage across

terminals 7 & 4 of

motor control relay?

Correct wiring

between terminal 3

of fan motor centrifugal switch and terminal 4 of

motor control rela

y.

Is there voltage on

terminal 3 of fan

motor centrifugal switch?

Replace fan motor.

Is there voltage across

terminals 3 & 5 of

fan motor centrifugal swi

tch?

Correct wiring

between cabinet

limit and terminal 5

of fan motor centrifugal switch.

Is there voltage to the

input side of the

cabinet limit?

Replace cabinet

limit.

Is there voltage across

cabinet limit?

Correct wiring

between stove limit

and cabinet limit.

Is there voltage to the input side of the stove

limit?

NO

YES

Is the

thermistor

operational?

Replace MDC

control.

Replace

thermisto

r.

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

TMB2040S

30. Unit Will Not Heat – Steam

62 70380601

30. Unit Will Not Heat – Steam (continued)

Correct wiring

between terminal 3

of fan motor

centrifugal switch

and terminal 4 of

motor control rela

y.

Replace fan motor.

Correct wiring

between cabinet

limit and terminal 5

of fan motor

centrifugal switch.

Replace cabinet

limit.

Correct wiring

between stove limit

and cabinet limit.

Replace the stove

limit.

Is there voltage across

the stove limit?

Correct wiring

between steam

valve and stove

limit.

Is there voltage across

the coil of the steam val

ve?

NO

YES

NO

YES

(12)

(13)

Does the steam valve

open allowing steam to flow?

Unit operational.

Replace or rebuild

steam valve.

No

TMB2040S

Micro Display Control (MDC) Troubleshooting

Please see following page for wiring diagram information.

70380601 63

Micro Display Control (MDC) Troubleshooting

Unit Will Not Heat – Steam

7

BLK

THERMISTOR

WHT

12345678910

H4

BLK

GRN/YEL

THERMISTOR

WHT

3241

5

WHT

025 & 030 MODELS 035 & 055 MODELS

TEMP. REGULATING

9

10 678

H4

H1-3

H1-1

HEAT RELAY

CIRCUIT CONTROLS

CHASSIS GROUND

WHT

H2-3

H2-6

Door Sense Ret

24Vac Ret

24VAC

WHT

5

846

3

BRN

SWITCH

WHT/

FAN MOTOR

CENTRIFUGAL

WHT

ORG/

WHT

5

M

BA

BRN/RED

3

WHT

H2-4

4

M

7

ORG BRN

N.C.

N.O.

COM

SWITCH

AIR FLOW

ORG/BRN

FS-1

2

TIME 20msec MIN.

Iin= 3-30ma

H3-1 & H3-2

START PULSE INPUT

BRN/WHT

H11L1

13

4N25

10 12

WHT/VLT

100 OHM

STEAM

VALVE

12

1/4 watt

3

4

5

H3

67

VLT/WHT WHT/BLK

VLT

LIMIT

STOVE

THERMOSTAT

LIMIT

CABINET

THERMOSTAT

TMB2218S

11

9

CONTROL

1

64 70380601

RED

WHT/BLU

MDC CONTROL

JUMPER H2-2 TO H2-5 AS FOLLOWS:

VOLTAGE CONFIGURATION INPUT

H2-5

SUPPLY

POWER

DOOR SENSING CIRCUIT ALLOWS

120Vac - 6.8K ohm 5 watt

24Vac - WIRE JUMPER

240Vac - 13.6K ohm 10 watt

CLOSED & SWITCH IS PRESSED

RELAY ONLY WHEN DOOR IS

CONTROL TO TURN ON MOTOR

H2-2

RED/BLK

MOTOR RELAY

H2-1

RED/BLK

FS-2

RED/BLK

H3-3 & H3-4

AVAILABLE OUTPUT

HEAT RELAY

OPTO OFF WHEN

MACHINE RUNNING

Vmax=28Vdc

24Vac

Imax=5ma

24Vac Ret

COIN DROPS

3

H6

21654

H1-4

H1-2

74 6 8 129 10 11

H5

3215

SEE VEND

APPLICATION DETAIL

31. Unit Will Not Heat – Electric

Note: Tests are conducted with u

nit running

and calling for heat.

All voltage checks are referenced to

transformer n

eutral.

Correct wiring

between FS-2 and

COM of lint panel

switch.

Is there voltage at

FS-2 of MDC control?

Is there voltage

on FS-1 of

MDC control?

Correct wiring

between COM of

airflow switch and

FS-1 of MDC

control.

Is there voltage at COM

of airflow switch?

Check for proper

function of airflow

switch and replace if

necessar

y

.

Is there voltage across

COM & N.C

. terminal

of airflow switch?

Correct wiring

between terminal 7

on motor con

trol

relay and N.C.

terminal on airflow

switch.

Is there voltage at

terminal 14 of moto

r

control relay?

Replace motor

control rela

y.

Is there voltage across

terminals 13 & 14 of motor control rel

ay?

Correct wiring

between terminal 3

of fan motor

centrifugal switch

and terminal 13 of

motor control relay

.

Is there voltage at terminal 3 of fa

n

motor centrifugal

switch?

Replace fan moto

r.

Is there voltage across

terminals 3 & 5 of

fan motor centrifugal switch?

Correct wiring

between cabinet

limit and termi

nal 5

of fan motor

centrifugal switch.

Is there voltage to the

input side of the

cabinet limit?

Replace cabinet

limit.

Is there voltage across

cabinet limit?

Correct wiring

between stove limit

and cabinet

limit.

Is there voltage to the input side of the stove

limit?

NO

YES

Is the

thermistor

operational?

Replace MDC

control.

Replace

thermisto

r.

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

NO

YES

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

TMB2041S

Micro Display Control (MDC) Troubleshooting

70380601 65

Micro Display Control (MDC) Troubleshooting

Replace the stove

limit.

Is there voltage across

the stove limit?

Correct wiring

between heater

contactor and stove

limit.

Is there voltage across

the coil(s) of the heater

contactor(s)?

NO

YES

NO

YES

(12)

(13)

Is there voltage to the

L1, L2 and L3

terminals of HC1?

Correct wiring

between HC1 and

line voltage.

Do all elements

produce heat?

Check elements for

shorts or opens.

Check wires

between con

tactors

and elements.

Is there voltage across

T1 & T2, T2 & T3 and

T3 & T1?

Check for proper operation of contactors, replace

them if necessary.

Is there voltage to the

L1, L2 and L3

terminals of HC2?

YES

NO

Correct wiring

between HC2 and

line voltage.

(14)

(15)

YES

NO

(16)(17)(18)

NO

YES

NO

YES

Unit is operational

Note: Please make

the oppropriate

adjustments if your

unit is single phase.

TMB2041S

31. Unit Will Not Heat – Electric (continued)

Please see following page for wiring diagram information.

66 70380601

TMB2219S

L3

L2

L1

SERVICE

TB3

1

2

3

4

BLK/

WHT

BLK/

WHT

PRIMARY

FUSES

AGC-2A

250V

BLK

1

2

HEATING ELEMENTS

SECONDARY

FUSE

MDL-3.5A

250V

M

FAN MOTOR

CENTRIFUGAL

SWITCH

DOOR

SWITCH

WHT

CHASSIS GROUND

WHT

LINT

PANEL

SWITCH

AIR FLOW

SWITCH

RED

RED/WHT

N.O.

COM COM

N.O.

BRN/RED

WHT

ORG/BRN

COM

N.O.

ORG BRN

ORG/

WHT

WHT/

BRN

BRN/WHT

N.C.

BLK

THERMISTOR

M

14

13

RED/BLU

WHT

RED/WHT

RED/BLK

WHT/VLT

WHT

RED/BLK

RED

WHT/BLU

SECONDARY

FUSE

1.25 T

250V

RED

WHT

GRN/YEL

WHT

12345678910

WHT

THERMISTOR

BLK

WHT

H4

025 & 030 MODELS 035 & 055 MODELS

CABINET

LIMIT

THERMOSTAT

STOVE

LIMIT

THERMOSTAT

VLT

VLT/WHT

TB1-L3

TB1-L2

TB1-L1

SEE

TRANSFORMER

CONFIGURATION

JUMPER

HC2

L3

T3 T1

L1

HC2

HC1

HC2

HC1HC1

L3

T3

H3

H5

L2

T2

L2

T2

H2

H4

L1

T1

H1

H6

24V

4.0A

24V

1.5A

12 3 4 5 6

HC1

HC2

3

5

TEMP. REGULATING

HEAT RELAY

CIRCUIT CONTROLS

3215

FS-2

H2-1

4N25

24Vac Ret

24Vac

MACHINE RUNNING

H6

3

APPLICATION DETAIL

SEE VEND

H5

74 6 8 129 10 11

COIN DROPS

H1-4

H1-2

21654

6

7

Vmax=28Vdc

Imax=5ma

H3

5

4

3

HEAT RELAY

MOTOR RELAY

START PULSE INPUT

AVAILABLE OUTPUT

TIME 20msec MIN.

Iin= 3-30ma

H3-1 & H3-2

OPTO OFF WHEN

H3-3 & H3-4

MDC CONTROL

120Vac - 6.8K ohm 5 watt

24Vac - WIRE JUMPER

240Vac - 13.6K ohm 10 watt

JUMPER H2-2 TO H2-5 AS FOLLOWS:

VOLTAGE CONFIGURATION INPUT

H2-2

H2-5

SUPPLY

POWER

CONTROL

CLOSED & SWITCH IS PRESSED

RELAY ONLY WHEN DOOR IS

CONTROL TO TURN ON MOTOR

DOOR SENSING CIRCUIT ALLOWS

24Vac Ret

24VAC

H1-1

H1-3

9

H4

10 678

1/4 watt

12

100 OHM

H11L1

FS-1

H2-4

H2-3

Door Sense Ret

H2-6

3241

1

14

7

846

10 12

13

5

2

3

11

17

16

18

15

9

Micro Display Control (MDC) Troubleshooting

Unit Will Not Heat – Electric

70380601 67

Micro Display Control (MDC) Troubleshooting

To re d uc e th e r is k o f e l ec tri c s h oc k, fir e, exp lo s ion , s er i ou s i n ju ry or dea th:

•Disconnect electric power to the dryer(s) before servicing.

•Close gas shut-off valve to gas dryer(s) before servicing.

•Never start the dryer(s) with any guards/panels removed.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the dryer is properly grounded.

W001R1

WARNING

32. Error Codes

OP - Indicates physical “open” in the thermistor circuit. Possible causes are: 1) thermistor, 2) wiring between control and thermistor, 3) control.

SH - Indicates a “short” in the thermistor circuit. Possible causes are: 1) shorted thermistor, 2) a short in the wiring between control and thermistor, 3) control.

Card Reader Machines: (In addition to the above errors)

EC:19 - Indicates no card reader communication. The control and the reader cannot communicate. Check reader, control and harness.

NOTE: For all other card reader errors, consult the card reader manual provided by the manufacturer.

Display Definition Corrective Action

OP

Indicates an open circuit in the thermistor.

• Check thermistor. Replace if inoperative.

• Check wiring between control and

thermistor. Refer to wiring diagram for proper wiring.

• Check control. Replace if inoperative.

SH

Indicates a short circuit in the thermistor.

• Check thermistor. Replace if inoperative.

• Check wiring between control and

thermistor. Refer to wiring diagram for proper wiring.

• Check control. Replace if inoperative.

EC:19

*Card Reader

models only

Indicates no communication between control and card reader.

• Check card reader. Replace if inoperative.

• Check wire harness connecting card reader

and control. Replace if inoperative.

• Check control. Replace if inoperative.

68 70380601

Micro Display Control (MDC) Troubleshooting

TMB2241S

70380601 69

Gas and Steam Models

Control Circuit Schematic

Micro Display Control (MDC) Troubleshooting

TMB2221S

70 70380601

Gas and Steam Models

Control Circuit Connection

Micro Display Control (MDC) Troubleshooting

TMB2027S

70380601 71

Gas and Steam Models

Control Box Schematic

Micro Display Control (MDC) Troubleshooting

TMB2026S

72 70380601

Gas and Steam Models

Control Box Connection

Micro Display Control (MDC) Troubleshooting

TMB2222S

70380601 73

Gas and Steam Models

Control Circuit Schematic

Micro Display Control (MDC) Troubleshooting

TMB2223S

74 70380601

Gas and Steam Models

Control Circuit Schematic

Micro Display Control (MDC) Troubleshooting

TMB2027S

70380601 75

Gas and Steam Models

Control Box Schematic

Micro Display Control (MDC) Troubleshooting

TMB2026S

76 70380601

Gas and Steam Models

Control Box Connection

TMB2220S

Micro Display Control (MDC) Troubleshooting

70380601 77

Electric Models

Control Circuit Schematic

Micro Display Control (MDC) Troubleshooting

TMB2224S

78 70380601

Electric Models

Control Circuit Connection

Micro Display Control (MDC) Troubleshooting

TMB2030S

70380601 79

Electric Models

Control Box Connection

Micro Display Control (MDC) Troubleshooting

TMB2031S

80 70380601

Electric Models

Control Box Schematic

Section 7

To re d uc e th e r is k o f e l ec tri c s h oc k, fir e, exp lo s ion , s er i ou s i n ju ry or dea th:

•Disconnect electric power to the tumble dryer before servicing.

•Close gas shut-off valve to gas tumble dryer before servicing.

•Close steam valve to steam tumble dryer before servicing.

•Never start the tumble dryer with any guards/panels removed.

•Whenever ground wires are removed during servicing, these ground wires must be reconnected to ensure that the tumble dryer is properly grounded.

W002R1

WARNING

On Premise Micro Control Troubleshooting

Models with OM Control Suffix

70380601 81

On Premise Micro Control (OM) Troubleshooting

Control Has No

Display

Is there

power supplied

to the unit?

Is there

120 VAC

at input of

primary fuses?

Yes

Plug unit in

and start cycle.

No

Correct wiring

between primary

fuse and power

supply.

No

Is there

120 VAC across

terminals 1 & 2 of

transformer

primary?

No

Correct wiring

between primary

fuse and

transformer.

Is there

24 VAC across

terminals 1 &

4 of transformer

secondary?

No

Replace

transformer.

TMB2251S

Yes

No

Correct wiring

between

transformer and

control.

Is there

24 VAC across

H3-3 and H3-4 on

the control?

Yes

Is there

120 VAC at

output side of the

primary fuses?

No

Replace primary

fuse(s).

Yes

Gas, steam and electric heat. Single and three phase power supply.

(1)

(2)

(3)

Is the

control fuse

functional?

Replace

control fuse.

Replace

control.

Yes

No

(4)

(5)

(6)

Yes

33. Control Has No Display

82 70380601

On Premise Micro Control (OM) Troubleshooting

4

2

3

5

1

6

Control Has No Display

70380601 83

TMB2280S

On Premise Micro Control (OM) Troubleshooting

34. Door Open Indicator

Door Open

Indicator

(1)

Is there

24 VAC between

H2-8 and

H2-9?

No

Is there

power supplied

to the unit?

Yes

(2)

Is there

120 VAC at input

of primary fuses?

Gas, steam and electric heat. Single and three phase power supply.

Yes

No

Replace control.

Plug unit in and

start cycle.

Correct wiring between primary fuses and power

supply.

Reference voltage checks to transformer neutral.

(5)

Is there

24 VAC across

terminals 2 &

3 of transformer

secondary?

Yes

(6)

Is there

24 VAC at the

input of the secondary

fuse?

Yes

(7)

No

Replace

transformer.

Correct wiring

between

secondary

fuse and

transformer.

Yes

(3)

Is there

120 VAC at

output side of the

primary fuses?

Yes

(4)

Is there

120 VAC across

terminals 1 & 2 of

transformer

primary?

Yes

No

Replace primary

fuse(s).

Correct wiring

No

between primary

fuses and

transformer.

Is there

24 VAC at output

side of secondary

fuse?

Yes

(8)

Is there

24 VAC at COM

of door switch?

Yes

Continued on

secondary fuse.

No

Correct wiring

between COM

secondary fuse.

Replace

and output of

TMB2252S-a

84 70380601

34. Door Open Indicator (continued)

With door

closed is there 24

VAC to N.O. of

door switch?

Is there

24 VAC at COM

of lint panel

switch?

Yes

Check for proper

function of door

switch, replace if

necessary.

No

Correct wiring

between N.O. on

door switch and

COM on lint panel

switch.

No

TMB2252S-b

Is there

24 VAC at N.O.

of lint panel switch

with lint panel

closed?

No

Check lint panel switch for proper

operation, replace

if necessary.

Yes

(9)

(11)

Correct wiring

between H2-8 of

electronic control

and N.O. of lint

panel switch.

Continued from

Yes

On Premise Micro Control (OM) Troubleshooting

70380601 85

Please see following page for wiring diagram information.

On Premise Micro Control (OM) Troubleshooting

4

2

3

5

1

8

10

7

6

11

9

Door Open Indicator

86 70380601

TMB2280S

35. Motor Will Not Start/Run

Is there

supply voltage

at terminals 5, 3 and 1

at the motor

contactor?

Motor Will Not

Start/Run

Is there

voltage between

H2-7 and H2-9?

Is there

24 VAC across

the coil of the motor

control relay?

Yes

Replace

control.

No

Correct wiring

to coil of

motor relay .

No

Is there supply voltage at black wire on the

motor control

relay?

No

Correct wiring

between black

wire and power

supply.

Is there supply voltage at

black wire on the

motor control

relay?

No

Replace motor

control relay.

TMB2282S

Yes

No

Correct wiring

between motor

and motor

control relay.

Is there supply voltage across

terminals 1 & 4 of

the motor?

Yes

Is the unit

equipped with single

phase or three phase

power?

Yes

Gas, steam and electric heat. Single and three phase power supply.

(1)

(2)

(3)

(4)

(5)

Note: Test conducted with vend price satisfied and start button pressed.

Note: For high voltage three phase supply (200 volts or higher), the motor is supplied by L1, L2, L3 through the motor contactor terminals T1, T2, T3. Make the appropriate adjustments when doing voltage checks.

Single phase

Replace

motor.

Yes

3 phase

(6)

Correct wiring

between L1, L2,

L3 and power

supply.

Is there

supply voltage

at terminals 6, 4 and 2

on the motor

contactor?

No

Yes

Replace motor

control relay.

Yes

(7)

Is there

supply voltage

between L1-L2, L2-L3

and L1-L3 and T1-T2,

T2-T3 and T1-T3

of motors?

Replace

motor.

Correct wiring

between motor

and motor contactor.

No

Yes

(8)

On Premise Micro Control (OM) Troubleshooting

70380601 87

On Premise Micro Control (OM) Troubleshooting

TMB2280S

1

2

5

4

3

Motor Will Not Start/Run – Single Phase

88 70380601

On Premise Micro Control (OM) Troubleshooting

TMB2281S

6

7

8

2

1

Motor Will Not Start/Run – 3 Phase

70380601 89

On Premise Micro Control (OM) Troubleshooting

Unit Will Not

Heat – Gas

Is there

voltage at H2-5

of control?

Is there

voltage on BRN

wire on motor

contactor?

Yes

Replace

thermistor.

Correct wiring

between H2-5 and

motor contactor.

No

Is

there

voltage to the

input of the

cabinet

limit?

No

Correct wiring

between cabinet

limit and terminal

5 of fan motor.

No

Check cabinet limit for proper

operation.

Replace

if necessary.

TMB2283S-a

Yes

Is

there

voltage at ORG/WHT

wire on motor

contactor?

Yes

All voltage checks are referenced to transformer neutral.

(1)

(8)

(9)

Note: Tests are conducted with unit running and calling for heat.

Is the

thermistor

operational?

No

Replace

control.

(5)

Replace motor

contactor.

No

Yes

No

Is there

voltage to the

input of the

stove limit 1?

Correct wiring

between stove

limit 1 and normally

open terminal of

the airflow switch.

(10)

No

Continued on

Is there

voltage to the

N.O. terminal of the airflow

switch?

No

Correct wiring

between airflow

switch and

cabinet limit.

Is there

voltage to the

common of the

airflow

switch?

(2)

(3)

(4)

Check for proper

operation of

airflow switch.

Replace if

necessary.

Yes

No

Yes

Is there

voltage to terminal 3

of the motor

contactor?

(6)

Correct wiring

between motor

terminal 3 and

motor contactor.

Is there

voltage at terminal

5 of the fan

motor?

No

Yes

Check motor for

proper operation.

Replace if

necessary.

No

(7)

Is

there

voltage to the

output of the

cabinet

limit?

36. Unit Will Not Heat – Gas

90 70380601

36. Unit Will Not Heat – Gas (continued)

Is there

voltage to the

output side of the

stove limit 1?

Yes

Check operation

of stove limit 1.

Replace if necessary.

No

Correct wiring

between stove

limit 2 and

stove limit 1.

No

TMB2283S-b

No

Yes

(11)

(13)

Continued from

Note: Make sure unit is not in a lockout condition.

No

(14)

(15)

Yes

Is there

voltage to

terminal 2 of the

Ignition Control

Module

(ICM)?

Yes

No

Does the igniter

spark?

Replace high voltage ignition cable, igniter or

ICM board.

Is there a

flame?

Unit

operational.

Is there

voltage across

the coils of the

gas valve?

No

Correct wiring

between gas

valve and

ICM board.

(16)

Yes

Is there gas flow

through the gas

valve?

Replace gas

valve coils or

complete

gas valve.

Yes

No

Yes

No

Yes

No

Is there

voltage to the

input side of the

stove limit 2?

Is there

voltage to the

output side of the

stove limit 2?

Check operation

of stove limit 2.

Replace if necessary.

Is there

voltage at

terminal 1 of

ICM board?

Replace

ICM board.

Correct wiring

between terminal 2

of ICM and stove

limit.

On Premise Micro Control (OM) Troubleshooting

70380601 91

Please see following page for wiring diagram information.

On Premise Micro Control (OM) Troubleshooting

1

2

3

4

11

5

10

6

7

8

9

12

15

16

13

14

Unit Will Not Heat – Gas

92 70380601

TMB2280S

37. Unit Will Not Heat – Steam

Unit Will Not

Heat – Steam

Is there

voltage at H2-5

of control?

Is there

voltage on BRN

wire on motor

contactor?

Yes

Replace

thermistor.

Correct wiring

between H2-5 and

motor contactor.

No

TMB2284S-a

Yes

All voltage checks are referenced to transformer neutral.

(1)

Note: Tests are conducted with unit running and calling for heat.

Is the

thermistor

operational?

No

Replace

control.

(5)

Replace motor

contactor.

No

Yes

No

Continued on

voltage to the

N.O. terminal of the airflow

switch?

No

Correct wiring

between airflow

switch and

cabinet limit.

Is there

voltage to the

common of the

airflow

switch?

(2)

(3)

(4)

Check for proper

operation of

airflow switch.

Replace if

necessary.

Yes

No

Yes

No

Yes

(7)

(6)

Yes

(8)

Correct wiring

between cabinet

limit and terminal

5 of fan motor.

No

Yes

No

(9)

Is

there

voltage at ORG/WHT

wire on motor

contactor?

Is there

voltage to terminal 3

of the motor

contactor?

Correct wiring

between motor

terminal 3 and

motor contactor.

Is there

voltage at terminal

5 of the fan

motor?

Check motor for

proper operation.

Replace if

necessary.

No

Is

there

voltage to the

input of the

cabinet

limit?

Is

there

voltage to the

output of the

cabinet

limit?

Check cabinet limit for proper

operation.

Replace

if necessary.

On Premise Micro Control (OM) Troubleshooting

70380601 93

On Premise Micro Control (OM) Troubleshooting

TMB2284S-b

Is there

24 VAC across

the coil of the

steam valve?

No

Correct wiring

between steam

valve coil and

motor.

Does the

steam valve

coil have

continuity?

No

Replace the steam valve

coil.

Yes

No

Connect the

steam supply.

Is the steam

supply

functional?

Yes

(10)

Replace or

rebuild the

steam valve.

Yes

Continued from

Please see following page for wiring diagram information.

94 70380601

On Premise Micro Control (OM) Troubleshooting

1

2

3

4

5

6

7

8

9

10

Unit Will Not Heat – Steam

70380601 95

TMB2280S

On Premise Micro Control (OM) Troubleshooting

Unit Will Not

Heat – Electric

Is there

voltage at H2-5

of control?

Is there

voltage on BRN

wire on motor

contactor?

Yes

Replace

thermistor.

Correct wiring

between H2-5 and

motor contactor.

No

Is

there

voltage to the

input of the

cabinet

limit?

No

Correct wiring

between cabinet

limit and terminal

5 of fan motor.

No

Check cabinet

limit for proper

operation.

Replace

if necessary.

TMB2286S-a

Yes

Is

there

voltage at ORG/WHT

wire on motor

contactor?

Yes

All voltage checks are referenced to transformer neutral.

(1)

(8)

(9)

Note: Tests are conducted with unit running and calling for heat.

Is the

thermistor

operational?

No

Replace

control.

(5)

Replace motor

contactor.

No

Yes

No

Is there

voltage to the

input of the

stove limit ?

Correct wiring

between stove

limit and normally

open terminal of

the airflow switch.

(10)

No

Continued on

Is there

voltage to the

N.O. terminal of the airflow

switch?

No

Correct wiring

between airflow

switch and

cabinet limit.

Is there

voltage to the

common of the

airflow

switch?

(2)

(3)

(4)

Check for proper

operation of

airflow switch.

Replace if

necessary.

Yes

No

Yes

Is there

voltage to terminal 3

of the motor

contactor?

(6)

Correct wiring

between motor

terminal 3 and

motor contactor.

Is there

voltage at terminal

5 of the fan

motor?

No

Yes

Check motor for

proper operation.

Replace if

necessary.

No

(7)

Is

there

voltage to the

output of the

cabinet

limit?

38. Unit Will Not Heat – Electric

96 70380601

On Premise Micro Control (OM) Troubleshooting

Is there

voltage to the

output side of the

stove limit?

Is there supply

voltage to the L3-L1,

L1-L2 and L3-L2

terminals of HC2?

Yes

Check operation

of stove limit.

Replace if

necessary.

No

Correct wiring

between HC2 and

line voltage.

No

TMB2286S-b

No

Correct wiring

between HC1 and

line voltage.

Yes

(11)

(13)

Continued from

Is there supply

voltage across T1-T2,

T2-T3 and T1-T3 ?

No

Check for proper

operation of

contactors,

replace them if

necessary.

(14)(15)

Yes

Do all elements

produce heat (glow

a slight orange

color)?

Check elements

for shorts or opens. Check wires between

contactors and

elements.

No

Unit

operational.

Yes

Is there supply

voltage to the L1-L2,

L2-L3 and L1-L3

terminals of HC1?

38. Unit Will Not Heat – Electric (continued)

Please see following page for wiring diagram information.

70380601 97

On Premise Micro Control (OM) Troubleshooting

TMB2285S

2

3

5

7

4

6

8

9

10

11

12

14

13

15

1

Unit Will Not Heat – Electric

98 70380601