Alliance Laundry Systems JC50CG, ATB50CG, JC50EG, JCB50CG, JCB50EG Troubleshooting Manual

Drying Tumblers

50 Pound Capacity 75 Pound Capacity

Refer to Page 5 for Model Numbers

Troubleshooting

www.comlaundry.com

T012c

Part No. 70410501

September 2007

Table of

Section 1 – Safety Information ...............................................................3

Locating An Authorized Service Person ...............................................4

Contents

Section 2 – Introduction..........................................................................5

Model Identification ..............................................................................5

Customer Service...................................................................................6

Serial Plate Location..............................................................................6

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

Safety Precautions for Servicing Tumblers...........................................7

How A Tumbler Works.........................................................................8

Section 3 – Troubleshooting..................................................................10

1. Motor Does Not Start..................................................................11

2. Motor Overload Protector Cycles Repeatedly ............................13

3. Motor Runs But Cylinder Does Not Turn...................................14

4. Motor Does Not Stop..................................................................15

5. Heating Element Does Not Heat Or Burner Does Not Ignite

– Gas and Electric Models ..........................................................16

6. Pilot Does Not Ignite – Standing Pilot Ignition Gas Models......18

7. Pilot Goes Out – Standing Pilot Ignition Gas Models ................19

8. Igniter Does Not Shut Off After Gas Ignition

– Automatic Pilot Ignition Gas Models ......................................20

9. Gas Supply Sufficient But Igniter Does Not Glow

– Glow-Bar Ignition Gas Models................................................21

10. Igniter Glows, Sensor Opens But No Ignition

– Johnson Controls System Gas Models.....................................22

11. Igniter Glows, Sensor Opens But No Ignition

– White Rodgers Glow-Bar Ignition Gas Models.......................23

12. Burner Ignites and Goes Out Repeatedly

– Glow-Bar Ignition Gas Models................................................24

13. Heating Element or Burner Shuts-Off Prematurely....................25

14. Heating Element or Burner Repeatedly Cycles Off On

High Limit Thermostat................................................................26

15. Heating Element or Burner Does Not Shut-Off..........................27

16. Clothes Do Not Dry ....................................................................28

17. Tumbler Overheating ..................................................................29

18. Burners Not Burning Properly – Gas Models.............................30

19. Loading Door Opens During Operation......................................31

20. Tumbler Runs But No Steam To Coils – Steam Models............32

21. Water In Steam Line – Steam Models ........................................33

22. Troubleshooting Electronic Control Models...............................34

23. Tumbler Will Not Start, Time on Drying Timer,

Door Closed – Manual Timer Models ........................................36

24. Motor Runs, Time on Drying Timer But No Heat......................37

25. No Spark to Pilot Burner – Electronic Pilot Ignition Models.....39

26. Spark to Pilot Burner, No Pilot Flame

– Electronic Pilot Ignition Models..............................................40

27. Spark To Pilot Burner, Pilot Lights, No Main Burner

– Electronic Pilot Ignition Models..............................................41

the expressed written consent of the publisher.

70410501 1

28. Igniter Does Not Glow – Johnson Controls

Glow-Bar System........................................................................42

29. Igniter Glows Constantly – Johnson Controls and

White Rodgers Glow-Bar System...............................................43

30. Igniter Glows, Cycles Off But Burner Does Not Ignite

– Johnson Controls Glow-Bar System........................................44

31. Igniter Does Not Glow – White Rodgers Glow-Bar System......45

32. Igniter Glows, Cycles Off But Burner Does Not Ignite

– White Rodgers Glow-Bar System............................................46

33. Igniter Sparks, No Main Burner Ignition

– Instant Electronic Ignition........................................................47

34. CSH OM Models: No Heat With Cycle Selected,

Unit Running and Calling For Heat............................................48

35. OM Models: No Start With Cycle Selected, Start Button

Pressed and Door Closed ............................................................50

36. OM Models: No Display After Selecting One Of The

ON/SELECT Keys......................................................................52

37. CE OM Models: No Heat With Cycle Selected, Unit

Running and Calling For Heat ....................................................53

38. CG OM Models: No Heat With Cycle Selected, Unit

Running and Calling For Heat ....................................................55

39. OM Models: No Fan Motor Rotation With Cycle Selected

and Start Pressed.........................................................................57

40. MM Models: Fan Motor Does Not Run With Door Closed,

Cycle Selected and Start Button Pressed ....................................58

41. MM Models: Cylinder Motor Does Not Run or Reverse With Door Closed, Cycle Selected and Start Button Pressed In

Reversing Mode or Nonreversing Mode.....................................59

42. MM Models: No Heat With Cycle Selected, Unit Running

and Calling For Heat...................................................................61

43. MM Models: No Heat With Cycle Selected, Unit Running

and Calling For Heat...................................................................63

44. OM Reversing Models: No Cylinder Rotation or Reversing

Capabilities..................................................................................65

45. MM Models: No Display After Pressing the ON/SELECT

Keys ............................................................................................67

46. MM Models: Motor Does Not Run With Door Closed, Cycle

Selected and Start Button Pressed...............................................68

47. MM Models: Cylinder Motor Does Not Run or Reverse With Door Closed, Cycle Selected and Start Button Pressed In

Reversing Mode or Nonreversing Mode.....................................69

48. MM Nonreversing Models: Motor Does Not Run With Door

Closed, Cycle Selected and Start Button Pressed .......................71

49. CD Models: No Start With Vend Satisfied and Start Button

Pushed.........................................................................................73

50. CD Models: No Heat With Vend Satisfied and Unit Running ...75

51. CD Models: No Heat With Vend Satisfied and Unit Running ...77

52. CD Models: No Start With Vend Satisfied and Start Button

Pushed.........................................................................................79

53. CD Models: No Start With Vend Satisfied and Start Button

Pushed.........................................................................................81

Section 4 – Adjustments........................................................................82

54. Cylinder Clearance......................................................................82

2 70410501

Section 1

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.

DANGER

DANGER indicates the presence of a hazard that will cause severe personal injury, death, or substantial property damage if the danger is ignored.

WARNING

WARNING indicates the presence of a hazard that can cause severe personal injury, death, or substantial property damage if the warning is ignored.

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

WARNING

• 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

CAUTION

CAUTION indicates the presence of a hazard that will or can cause minor personal injury or property damage if the caution is ignored.

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.

70410501 3

Safety Information

IMPORTANT INFORMATION: During the lifetime of a tumbler, 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 tumbler, and who are equipped with the proper tools and testing equipment.

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Never start the tumbler with any guards/ panels removed.

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

W240

WARNING

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 tumbler. These factors MUST BE supplied by the person(s) installing, maintaining or operating the tumbler.

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

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.

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

CAUTION

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

4 70410501

Section 2

Introduction

Model Identification

Information in this manual is applicable to these models:

Gas Steam/Thermal Oil Electric

50

Pound

75

Pound

AT B 50 C G DCB50CG DCB50EG DTB50CG DTB50EG JC50CG JC50EG JCB50CG JCB50EG JT37CG JT37CGI JT37EG JT37EGI JT50CG JT50CGI JT50EG

AT B 75 C G DCB75CG DCB75FG DTB634 DTB75CG DTB75EG DTB75FG JCB75CG

JT50EGI JTB50CG JTB50EG SC50CG SC50EG SCB50CG SCB50EG ST37CG ST37CGI ST37EG ST37EGI ST50CGI ST50EGI STB50CG STB50EG TKD50CGMT

JT75CG JT75EG JTB75CG JTB75EG SCB75CG ST75CG STB634 STB75CG STB75EG

AT B 50 C S H DCB50CSH DTB50CSH DTB50CSL JC50CSH JCB50CSH JT37CSH JT37CSL JT50CSH JT50CSL

AT B 75 C S H DCB75CSH DCB75CSL DTB75CSH DTB75CSL JCB75CSH JCB75CSL JT75CSH JT75CSL

JTB50CSH JTB50CSL SC50CSH SCB50AT SCB50CSH ST37CSH ST37CSL ST50CSH ST50CSL STB50CSH STB50CSL

JTB75CSH JTB75CSL SCB75CSH SCB75CSL ST75CSH ST75CSL STB75CSH STB75CSL

DCB50CE DTB50CE JC50CE JCB50CE JT37CE JT50CE JTB50CE SC50CE SCB50CE ST37CE ST50CE STB50CE TKD50CEMT

DCB75CE DTB75CE JCB75CE JT75CE JTB75CE SCB75CE ST75CE STB75CE

70410501 5

Introduction

Customer Service

If literature or replacement parts are required, contact the source from whom 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 (920) 748-3121.

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(s) as shown.

T419IE3B

6 70410501

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 tumbler. 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. Refer to Parts Manual for ordering replacement decals.

Safety Precautions for Servicing Tumblers

• Disconnect electrical service.

• Shut off supply gas valve before servicing gas components.

• Control panel and access panel MUST be reinstalled after inspection or servicing of tumbler is completed.

Introduction

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

• Chain/drive guard MUST be reinstalled after inspection or servicing of tumbler is completed.

• Belt guard MUST be reinstalled after inspection or servicing of tumbler is completed.

• Contactor box cover MUST be reinstalled after inspection or servicing of electric and/or reversing tumbler is completed.

• Loading door switch MUST be operational before putting tumbler into service.

• Junction box cover MUST be reinstalled after inspection or servicing of tumbler is completed.

70410501 7

Introduction

How A Tumbler Works

Fresh Air Combustion Air Mixed Air Exhaust Air

Standard Models

The tumbler uses heat, air and movement to dry loads of laundry.

When the motor is started, the exhaust fan pulls fresh air in through the air intake 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 laundry by the tumbling action of the cylinder.

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

T008CE1A

NOTE: In Energy Saver Models, some of the exhaust air is recirculated. Refer to illustration on next page.

8 70410501

Introduction

Fresh Air Combustion Air Mixed Air Recirculating Air Exhaust Air

T007CE1A

Energy Saver Models

70410501 9

Section 3

Troubleshooting

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

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

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

W002

10 70410501

1. Motor Does Not Start

Motor does

not start

Is the

electrical power

off or circuit breaker

fuse blown?

No

Yes

Check power

supply or replace

fuses.

Is there

broken, loose, or

incorrect

wiring?

No

Are

improper

coins inserted in

accumulator?

Yes

Refer to wiring

Check that proper

coins are inserted.

Troubleshooting

diagram.

Is the

loading door

not closed or switch

inoperative?

No

Is the

door switch

improperly

adjusted?

No

Is the start circuit

not complete?

No

Yes

Close door or

test switch and

replace if

inoperative.

Refer to

Installation

Manual

door switch

adjustment.

start switch or test switch and replace if

inoperative.

for

Press

No

Is

accumulator knob

improperly set

after coins were

inserted.

No

Is the

run switch accumulator inoperative?

No

Is the

motor relay

inoperative?

Yes

Turn knob

clockwise to its full

limit of travel.

Test run switch

and replace if

inoperative.

Test relay and

inoperative.

replace if

Have motor tested

Is the motor

inoperative?

No

70410501 11

Yes

and replace if

inoperative.

No

continued on

Troubleshooting

1. Motor Does Not Start (continued)

Continued from

trunnion bearings

binding?

No

Are

idler bearings

binding?

No

Is timer

improperly

set?

Yes

Turn drying timer

Yes

desired setting.

Replace

trunnion

bearings.

Replace

bearings.

clockwise to

No

Is timer

inoperative?

12 70410501

Yes

Test timer and

replace if

inoperative.

TMB2131S-b

2. Motor Overload Protector Cycles Repeatedly

Motor Overload

Protector

Cycles

Repeatedly

Refer to

Is voltage

correct?

No

Yes

Installation

Manual

requirements.

for

electrical

Troubleshooting

Is clothes

load too

large?

No

Is clothes

cylinder

binding?

No

Is wiring

adequate?

No

Is make-up

air adequate?

Yes

Remove part of

load.

Check cylinder

for binding.

Check with

local power

company to

ensure that

wiring is

adequate.

Refer to

Installation

Manual

make-up air

requirements.

for

No

Clean lint

Is there lint

buildup around

tumbler or poor

maintenance?

No

70410501 13

Yes

Is there

broken, loose

or incorrect

wiring?

accumulation

on and around

the motors.

Yes

Refer to wiring

diagram.

TMB1904S

Troubleshooting

3. Motor Runs But Cylinder Does Not Turn

Motor runs but cylinder

does not turn

Is cylinder belt

broken or

loose?

No

Is drive belt

broken or

loose?

No

Is cylinder

binding?

Yes

Replace or

adjust cylinder

belt.

Replace or

adjust drive

belt.

Check cylinder

for binding.

Is sheave

loose?

No

Is

drive chain or

sprocket broken

or loose?

Yes

No

Tighten

setscrews.

Replace or

adjust chain

or sprocket.

No

Is motor drive

pulley loose?

No

14 70410501

Yes

Tighten drive

pulley bushing

screws.

TMB2132S

4. Motor Does Not Stop

Troubleshooting

Motor does

not stop

Is the door

switch not

working

properly?

No

Is wiring

incorrect?

No

Is timer

or relay

inoperative?

Yes

Test switch and

replace if inoperative.

Refer to

Manual

switch adjustment.

Refer to wiring

and replace

if inoperative.

Installation

for proper

diagram.

Test timer

and relay

No

Is accumulator inoperative?

70410501 15

Yes

Test

accumulator

and replace if

inoperative.

TMB2133S

Troubleshooting

5. Heating Element Does Not Heat Or Burner Does Not Ignite – Gas and Electric Models

Heating element does

not heat or 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?

No

Is

drying timer

not selected or

inoperative?

Ye s

Refer to

Installation

Manual for

exhaust system

requirements.

Check fuses or

circuit breaker.

Set drying timer

or replace if inoperative.

Is the

airflow switch

inoperative?

No

Is airflow

switch out of adjustment?

No

Ye s

Te st switch and replace if inoperative.

Check back draft damper for foreign objects, lint accumulation or other causes that may prevent damper from opening.

Check exhaust outlet. If a screen has been improperly installed on the outlet, it may be clogged with lint or frozen over in winter. NEVER install a screen over the exhaust outlet.

Refer to Installation

Manual for airflow

switch adjustment.

No

Is

thermostat

inoperative?

No

Is there

lint

buildup?

No

Is there

inadequate

ductwork and

make-up air?

No

Ye s

Clean lint compartment.

Ye s

ductwork for lint buildup.

Ye s

Te st thermostat

and replace if

inoperative.

Check damper for lint

accumulation. Check

Refer to Installation

Manual to ensure that

ductwork and make-up

air openings are sized

accurately.

Is the lint

door panel

not closed

properly?

No

Is

there broken,

loose or incorrect

wiring?

No

Ye s

Open lint door

panel, place lint

door and panel

back on tumbler

(ensuring a tight fit).

Refer to

wiring diagram.

Continued on

16 70410501

Troubleshooting

5. Heating Element Does Not Heat Or Burner Does Not Ignite – Gas and Electric Models (continued)

Continued from

Are gas valve coils

inoperative?

Yes

Test coils and

replace if

necessary.

Electric

Models: Are

heating elements

or contactors

inoperative?

No

Gas Models:

Is there an

insufficient gas

supply?

No

Gas Models:

Are the orifices

incorrect?

No

Check heat

Yes

contactors and

elements.

Replace if

necessary.

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.

Tumbler 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

Gas Models:

Is main coil

inoperative?

No

Gas Models:

Is redundant coil

inoperative?

No

Standing Pilot

Ignition Gas

Models: Is pilot

not lit?

No

Yes

Test redundant coil

Yes

and replace

complete gas valve

if inoperative.

Refer to

Manual

instruction plate on

Yes

back of tumbler for

lighting and shutting down standing pilot.

Test main coil

and replace if

inoperative.

Installation

or

Gas Models:

Is there an

inoperative

igniter?

No

Gas Models:

Is the igniter control

inoperative?

No

70410501 17

Yes

Test igniter

and replace if

inoperative.

Test igniter control and

replace if

inoperative.

Standing

Pilot Ignition Gas

Models: Is gas valve

reset assembly or

thermocouple

inoperative?

No

Glow Bar

Ignition Gas Models: Is

sensor inoperative?

Yes

Check and

replace

thermocouple or

reset assembly

if necessary.

Test sensor

and replace if

inoperative.

TMB2134S-b

Troubleshooting

6. Pilot Does Not Ignite – Standing Pilot Ignition Gas Models

Pilot does not

ignite - Standing Pilot

Ignition Gas Models

Is

gas shut-off

valve to

tumbler

closed?

Yes

Open valve.

Is

thermocouple

inoperative?

Yes

Replace

thermocouple.

No

Is air present

in gas line?

No

Is pilot orifice

incorrect?

No

Is pilot gas

filter clogged?

Yes

Purge air from

gas line.

Tumbler is equipped

for type of gas

specified on serial

plate. If pilot orifice is

different from that

specified on serial

plate, obtain and

install correct orifice.

Replace reset

assembly.

No

Is pilot

assembly

inoperative?

Yes

Replace pilot

assembly.

No

Is pilot

gas tube or

pilot orifice

clogged?

No

18 70410501

Yes

Clean or

replace tube

or orifice.

TMB2135S

7. Pilot Goes Out – Standing Pilot Ignition Gas Models

Pilot goes out -

Standing Pilot Ignition

Gas Models

Is exhaust

system

improper or

inadequate?

No

Yes

Refer to

Installation

Manual

exhaust system

requirements.

for

Is pilot orifice

incorrect?

No

Yes

on serial plate,

Troubleshooting

Tumbler is

equipped for

type of gas

specified on

serial plate. If

pilot orifice is different from that specified

obtain and

install correct

orifice.

Is lint screen

clogged?

No

Is burner

flame

Improperly

adjusted?

No

Is there carbon

accumulation

on heated end

of pilot

thermocouple?

Yes

Remove and

clean lint

screen.

Close air shutter slightly - A harsh

roaring flame will

draw pilot flame out.

Wipe carbon

Yes

off end of

thermocouple.

Is gas

valve reset

assembly or

thermocouple

inoperative?

Yes

Check and

replace reset

assembly or

thermocouple

if necessary.

No

TMB2136S

70410501 19

Troubleshooting

8. Igniter Does Not Shut Off After Gas Ignition – Automatic Pilot Ignition Gas Models

Igniter does not shut off

after gas ignition -

Automatic Pilot Ignition

Gas Models

Tumbler is equipped

for type of gas

specified on serial

Is tumbler

not properly

equipped for

type of gas

being used?

No

Yes

plate. If tumbler is

equipped for gas different from that specified on serial

plate, obtain the

necessary

components to

correct the problem.

Is igniter

control

inoperative?

No

Yes

Test igniter

control and

replace if

inoperative.

Is gas supply

insufficient?

No

Is burner

flame

improperly

adjusted?

No

Is pilot and

electrode assembly

incorrectly

installed?

Yes

Open partially closed

gas shut-off valve or

correct low gas

pressure.

Refer to

Installation

Manual

recommended

burner flame

adjustment.

Yes

Check assembly

for correct alignment.

for

Is wiring

incorrect?

Refer to wiring

diagram located

Yes

on back of

tumbler or in

literature

packet.

No

TMB2137S

20 70410501

Troubleshooting

9. Gas Supply Sufficient But Igniter Does Not Glow – Glow-Bar Ignition Gas Models

Gas supply sufficient but

igniter does not glow Glow-Bar Ignition Gas

Models

Has sensor

failed with

contacts open?

No

Is igniter

broken or

open?

No

Is there no circuit for burner

operation?

Yes

Replace sensor.

Replace glow bar

igniter.

Tumbler is not

calling for heat,

check the heat

circuit to the ignition

system.

TMB2138S

70410501 21

Troubleshooting

10. Igniter Glows, Sensor Opens But No Ignition – Johnson Controls System Gas Models

NOTE: To check the primary and secondary valve coil and plunger operation, place fingers on top of coils, cycle the machine and restart ignition circuit, you should feel the primary valve coil plunger open first, followed by glow bar heat up, followed by the sensor opening, and the secondary valve coil plunger opening. If plungers do not open, electrically check the coils. Check gas pressure to tumbler. Line pressure should be 7 ± 1/2 inches (Natural Gas) or 11 inches (L.P. Gas) water column pressure. Manifold pressure should be 3.5 inches (Natural Gas) or 11 inches (L.P. Gas) water column pressure.

Igniter glows, sensor

opens but no ignition -

Johnson Controls

System Gas Models

Is gas supply

insufficient?

No

Is there gas

flow but no

ignition?

No

Is there no

gas flow

through gas

valve?

Yes

Check gas supply

and pressure.

Remove igniter and bracket and bend

“L” shaped bracket (located on left

side of stove) up or down. Reinstall

igniter and bracket and check for

1/8 to 1/4 inch gap between bottom

of igniter and top of main burner.

Check primary valve coil and plunger.

Replace coil if inoperative, or check

for 120 Volts to control relay (PR1)

coil contacts (A) and 120 Volts to

control relay (PR1) contact number 7.

If no voltage, replace control relay (PR1) or check secondary valve coil and plunger operation. Replace coil

if inoperative.

TMB2139S

22 70410501

Troubleshooting

11. Igniter Glows, Sensor Opens But No Ignition – White Rodgers Glow-Bar Ignition Gas Models

Igniter Glows, Sensor

Opens But No Ignition -

White Rodgers Glow-bar

Ignition Gas Models

Is gas supply

insufficient?

No

Is there gas

flow but no

ignition?

No

Is there no

gas flow

through gas

valve?

Ye s

Is manual

shut-off valve

in full open

position?

No

Gap between igniter

and burner must be

1/8 to 1/4 inch.

•

Check for 80 – 120 volts between red and white wire on gas valve.

•

If correct voltage is present and redundant coil does not click open, replace complete gas valve.

•

If correct voltage is not present, replace diode logic board.

•

If correct voltage is present and redundant coil clicks open, check for 40 – 60 volts across the purple wires on the main coil after the igniter cycles off.

•

If voltage is present and main coil does not st

•

If no voltage is present, replace diode logic board.

ay open, replace main coil.

Ye s

Check

gas pressure.

TMB2140S

70410501 23

Troubleshooting

12. Burner Ignites and Goes Out Repeatedly – Glow-Bar Ignition Gas Models

Burner ignites and

goes out repeatedly

- Glow-Bar Ignition Gas Models

Is there

insufficient

gas pressure?

Check gas supply

Yes

and pressure.

Low flame will

not maintain

sensor conductivity.

Does

tumbler have

improper orifices?

No

Yes

Tumbler 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

Are the

burner ports

plugged?

No

Is high limit

thermostat

inoperative?

No

Is the

exhaust system

improper or

inadequate?

Yes

Check burner tubes

for build-up.

Yes

Refer to

Flowchart 14

Yes

Refer to

Installation Manual

for exhaust system

equirements.

Is

there inadequate

make-up air?

No

Is

burner heat

not holding sensor

contacts open?

.

Yes

Refer to

Installation Manual

for make-up air

requirements.

Replace sensor.

No

TMB2141S

24 70410501

13. Heating Element or Burner Shuts-Off Prematurely

Heating element or

burner shuts-off

prematurely

Troubleshooting

Is there improper or inadequate

exhaust and/or

make-up air?

No

Gas Models: Is

there insufficient

gas supply?

No

Gas Models:

Is tumbler

not properly

equipped for type

of gas used?

No

Refer to

Yes

Installation

Manual

for exhaust and

make-up air

requirements.

Open partially

closed gas shut-off

valve or correct low

pressure.

Tumbler is

equipped

for type of gas

specified on serial

plate. If orifices are

different from that

specified on serial

plate, obtain and

install proper

orifices.

Glow-Bar Ignition

Gas Models: Is sensor

contact closing?

No

Is high limit

thermostat

cycling off?

No

Is there

broken, loose

or incorrect

wiring?

Yes

Flowchart 14

Yes

wiring diagram

located inside

contactor box.

Replace

sensor.

Refer to

.

Refer to

Gas Models:

Is burner flame

improperly

adjusted?

No

70410501 25

Yes

Refer to

Installation

Manual

for burner flame

adjustment.

TMB2142S

Troubleshooting

14. Heating Element or Burner Repeatedly Cycles Off On High Limit Thermostat

Heating element or

burner repeatedly

cycles off on high

limit thermostat

Is external

exhaust system

longer than

recommended or is

there inadequate

make-up air?

No

Is lint screen

clogged?

No

Is there lint

in tumbler

ducts?

Refer to

Yes

Installation

Manual

exhaust and

make-up air

requirements.

Remove screen

and clean. Lint

Yes

screen and

compartment

should be cleaned

after every eight

hour shift.

Clean tumbler

ducts.

for

Is high limit

thermostat

cycling at too

low a

temperature?

No

Is lint door

panel not

closed

properly?

Yes

Replace

thermostat.

Remove lint door

panel, place lint

door panel back on

tumbler (ensuring a

tight fit).

No

Is there lint

in external

exhaust system?

No

26 70410501

Yes

Disassemble

exhaust

system and

clean.

TMB2143S

15. Heating Element or Burner Does Not Shut-Off

Heating element or

burner does not

shut off

Are there

impurities on

gas valve seat,

preventing valve

from closing?

Yes

Replace

gas valve.

Troubleshooting

No

Is wiring correct?

No

Is drying timer,

relay or contactor

inoperative?

Yes

Refer to wiring

Yes

diagram.

Replace

timer, relay or

contactor.

TMB2144S

70410501 27

Troubleshooting

16. Clothes Do Not Dry

Clothes do not

dry

Is the

heat source

inoperative?

No

Is there

too much water in

articles being

dried?

No

Is

the clothes

load too

large?

No

Ye s

Refer to

Flowchart 5.

Remove excess

water.

Remove part

of load.

Does heat

source shut off

prematurely?

No

Is

the drying

timer

improperly

set?

No

Is

the voltage

incorrect?

No

Is there

inadequate

make-up

air?

Ye s

Refer to

Flowchart 13.

Set selector

for higher

setting.

Refer to Installation Manual for electrical

requirements.

Refer to Installation

Manual for make-up

air requirements.

Is the

exhaust system

improper or

inadequate?

No

28 70410501

Ye s

Refer to Installation

Manual for exhaust

system equirements.

TMB2145S

17. Tumbler Overheating

Tumbler

overheating

Gas Models:

Does tumbler

have incorrect main

burner orifices?

Yes

Obtain and install

correct orifices.

Is the

exhaust system

restricted or

inadequate?

Yes

Troubleshooting

Remove obstruction

or lint build up from

exhaust ductwork.

Refer to

Manual

Installation

for exhaust

system

requirements.

No

Gas Models: Is gas pressure too high or low?

No

Is the

make-up air

inadequate?

No

Is there

lint buildup?

Yes

Adjust gas pressure

as specified on

serial plate.

Refer to

Manual

air requirements.

Clean lint

compartment. Check

damper for lint

accumulation. Check

ductwork for lint

buildup.

Installation

for make-up

No

Is the

thermostat

inoperative?

Yes

Replace

thermostat.

No

TMB2146S

70410501 29

Troubleshooting

18. Burners Not Burning Properly – Gas Models

Burner not burning

properly

Are burner air

shutters incorrectly

adjusted?

No

Is there lint/dirt

in burner tube?

No

Is the gas

pressure too high

or low?

Yes

Installation

Manual

flame adjustment.

Disassemble

burner and

blow out the dirt.

Check serial

plate on back of

Refer to

for proper

tumbler for

correct gas

pressure.

Is

the airflow

switch not

functioning

properly?

Yes

Replace airflow

switch.

No

Does

the tumbler have

incorrect

orifices?

No

Is the

exhaust duct

restricted or

blocked?

No

30 70410501

Tumbler is equipped

for the type of gas specified on serial

Yes

plate. If orifices are

different from that

specified on serial

plate, obtain and

install correct

orifices.

Disassemble

and clean

exhaust system.

TMB2147S

19. Loading Door Opens During Operation

Loading Door Opens During

Operation

Troubleshooting

Is tumbler

improperly

leveled?

No

Is clothes load

too large?

No

Is door strike

adjusted

incorrectly?

Yes

Refer to

Manual

Remove part of load

and restart tumbler.

Installation

for leveling

leg adjustment.

Refer to

Installation Manual

for strike

adjustment.

TMB2126S

70410501 31

Troubleshooting

20. Tumbler Runs But No Steam To Coils – Steam Models

Tumbler runs but no

steam to coils

- Steam Models

Are valves

closed?

No

Is steam trap

blocked?

No

Is solenoid valve

inoperative?

No

Yes

Check all valves in

supply and return lines,

make sure they are

open.

Remove trap and

clean. Replace if

inoperative.

Check operation

of solenoid valve.

Is check valve

incorrectly

installed?

No

Is strainer

clogged?

No

Is timer or

thermostat

inoperative?

32 70410501

Yes

Check for inlet and outlet markings on

check valve and invert

if necessary.

Remove strainer and

clean.

Test timer or

thermostat. Replace if

inoperative.

TMB2148S

21. Water In Steam Line – Steam Models

Water in steam

line - Steam

Models

Troubleshooting

Is steam

piping

installed

incorrectly?

No

Is trap

functioning

improperly?

Yes

Refer to

Installation

Manual

requirements.

Check trap for size and capacity. If trap is dirty or sluggish clean thoroughly or replace.

Check return line for

high back pressure.

for

steam

TMB1887S

70410501 33

Troubleshooting

22. Troubleshooting Electronic Control Models

Troubleshooting

electronic control

models

Door open light

and display flash

with door closed –

Does door switch

Display

shows “PF”

(MM models) –

Has tumbler not

been run in last

six days?

Power tumbler for at least two

Yes

continuous days

to recharge

battery.

need adjustment?

No

Yes

Adjust and test

door switch.

No

Display

shows “PF”

(MM models) –

Has a custom

cycle not been

programmed into

memory?

No

Display shows

“PF” (MM

models) – Is

battery

discharged?

Enter a custom

Yes

cycle into

memory.

If tumbler has been powered for at least two

continuous days,

replace battery.

Door open light

and display flash

with door closed –

Is door switch

faulty?

No

Door open light

and display flash

with door closed –

Is electrical

service connected

incorrectly?

No

Yes

Replace

door switch.

Check service connections to

terminal block in

junction box. For

120 or 240 volt

tumblers, neutral

wire must be connected to

terminal marked

“NEUT”. On single

phase tumblers, hot

wire must be connected to

terminal marked “L1”. A ground wire must be secured to

the ground screw

in the junction box.

No

Continued on

34 70410501

22. Troubleshooting Electronic Control Models (continued)

Continued from

Display shows

“SH” and signal

sounds – Is

temperature at

sensor over 191˚F

(88.3˚C)?

No

Display shows

“SH” and signal

sounds – Is

temperature

sensor shorted?

Allow tumbler to

cool and press

Yes

ON/SELECT

pad. If display

still shows “SH”,

replace sensor.

temperature

Replace

sensor.

Display shows

“OP” and signal

sounds three minutes after

tumbler is started

– Is temperature

sensor open?

Yes

Replace

temperature

sensor.

No

Display shows

“OP” and signal

sounds three minutes after

tumbler is started –

Is temperature at

sensor under 24˚F

(-4.4˚C)?

No

70410501 35

Yes

If the

temperature of

the tumbler is

above 24˚F

(-4.4˚C), replace

temperature

sensor.

TMB2149S-b

Troubleshooting

23. Tumbler Will Not Start, Time on Drying Timer, Door Closed – Manual Timer Models

Tumbler will not start,

time on drying timer,

door closed – manual

timer models

Is

there line

voltage into

door

switch?

Yes

Is

there line

voltage out

of door

switch?

Yes

Is

there line

voltage at

terminal 3 of

control relay?

No

service to tumbler

broken wire or poor connection at harness plug.

Check electrical

(fuses/circuit

breaker).

Adjust door

switch rod.

No

Has

switch rod

mechanically

actuated door

switch?

Yes

Replace door

switch.

Check for

Is there line

voltage on

terminal 1 of

control relay?

Yes

Is there line

voltage into

push-to-start

switch?

Yes

Press

push-to-start switch. Is there line voltage out of push-to-start

switch?

Yes

No

Replace

relay.

Check for

broken wire

from

control relay

terminal 1.

Replace

push-to-start

switch.

Yes

Is

there line

voltage across

coil terminals

of control

relay?

Yes

36 70410501

No

Replace

timer.

No

Is

there line

voltage on

terminal B of

drying timer?

Is there

line voltage

to motor?

Yes

Replace

motor.

No

Check for

broken wire or poor connection at harness plug.

TMB2150S

24. Motor Runs, Time on Drying Timer But No Heat

Motor runs, time on drying timer but no

heat

Troubleshooting

Is there power out of main control

thermostat?

No

Is there

power into

main control

thermostat?

No

Is

there power

on terminal 6

of control

relay?

Yes

Check the

ignition circuit.

Replace main

control

thermostat.

Loose or broken

wire to main

control

thermostat.

Is there a

broken or

loose wire at

harness plug?

No

Is there power

on red wire

from motor?

Yes

Is there

power into

airflow

switch?

Yes

No

Yes

No

Check for loose

or broken wire

Replace airflow

Repair

wire.

Replace

motor.

from motor.

switch.

Yes

No

Is

there power

on terminal 4

of control

relay?

No

70410501 37

Yes

Replace

control relay.

Yes

Is

there power

across coil

terminals of

control relay?

Is there

power out

of airflow

switch?

Yes

Continued on

Is airflow

switch

closed?

No

Adjust airflow

switch.

TMB2151S-a

Troubleshooting

24. Motor Runs, Time on Drying Timer But No Heat (continued)

Continued from

power into

cabinet high

limit

thermostat?

Yes

Is there

power out of

cabinet high

limit

thermostat?

No

Check for broken wire from airflow

switch.

Replace

thermostat.

Yes

Is there

power into

burner high

limit

thermostat?

Yes

Is

there power

out of burner

high limit

thermostat?

Yes

Check for loose or

burned connection

at harness plug.

No

Check for

broken wire from

cabinet high

Replace burner

high limit

thermostat.

limit.

TMB2151S-b

38 70410501

25. No Spark to Pilot Burner – Electronic Pilot Ignition Models

No spark to pilot burner

– Electronic Pilot

Ignition Models

Is ceramic

insulator securely

bonded to pilot

Is there

24 volts between

terminal 2 and

ground on

electronic package?

Yes

No

Check

tumbler heat

circuit.

burner assembly (cannot swivel)?

Yes

Troubleshooting

Replace pilot

No

and electrode

assembly.

Is high tension cable securely

attached to

ignitor post?

Yes

Is there

arcing to

left burner?

No

Are there cracks

in ceramic

insulator

encasing ignitor

probe?

Yes

No

Yes

Correct.

Shift left burner

further to left.

Replace pilot

and electrode

assembly.

Is there a

7/64 inch gap

between electrode and left diverter of

pilot burner?

Yes

Replace

electronic

package.

No

and electrode

Replace pilot

assembly.

No

70410501 39

TMB2152S

Troubleshooting

26. Spark to Pilot Burner, No Pilot Flame – Electronic Pilot Ignition Models

Spark to pilot burner, no

pilot flame – Electronic

Pilot Ignition Models

Is there

24 volts between

terminal 1 and

ground on

electronic package?

No

Replace

electronic

package.

Yes

Is there

gas present at

pilot burner

(disconnect white

wire from terminal

3 and light

manually)?

No

Remove black wire

from terminal 1.

Momentarily touch

to terminal 2; is

“click” heard?

Yes

No

Replace right coil

(pilot

operator).

Is pilot filter,

tube or orifice

obstructed?

No

Refer to

Flowchart

25

.

Yes

Clear

obstruction.

Yes

TMB2153S

40 70410501

Troubleshooting

27. Spark To Pilot Burner, Pilot Lights, No Main Burner – Electronic Pilot Ignition Models

Spark to pilot burner, pilot

lights, no main burner –

Electronic Pilot Ignition Models

Are there 24 volts

between terminal 3 and

ground on electronic

package?

No

Is wire

between sensor and

terminal 4 of electronic

package connected

securely?

Yes

No

Replace left

coil (main operator).

Correct.

Is there a crack in

sensor ceramic

insulator?

Yes

Replace

sensor.

No

Check gas

pressure.

Is sensor

securely seated in

pilot burner?

Yes

Is pilot filter,

tube or orifice

obstructed?

No

70410501 41

No

Yes

orifice or use

Correct.

Clear pilot

larger pilot

orifice.

TMB2154S

Troubleshooting

28. Igniter Does Not Glow – Johnson Controls Glow-Bar System

Igniter does not glow –

Johnson Controls

Glow-Bar System

Is 120 volts

present between

black wire and

ground on main

thermostat?

Yes

No

Check heat

circuit.

Is 120 volts

present between

red and white wires

of igniter bracket?

Yes

Is 120 volts

present between

each of the purple

wires of sensor and

ground?

No

Replace

igniter.

Replace

sensor.

TMB2155S

42 70410501

Troubleshooting

29. Igniter Glows Constantly – Johnson Controls and White Rodgers Glow-Bar System

Igniter glows constantly –

Johnson Controls and

White Rodgers

Glow-Bar System

Replace

sensor.

TMB2156S

70410501 43

Troubleshooting

30. Igniter Glows, Cycles Off But Burner Does Not Ignite – Johnson Controls Glow-Bar System

Igniter glows, cycles off

but burner does not ignite

– Johnson Controls

Glow-Bar System

Is 120 volts

present across the

two wires of the

primary coil?

Yes

Can you feel

or hear the

primary coil

open?

Yes

Is 120 volts

present across the

two wires to the secondary coil?

No

Check for a broken

wire between the

terminal block and

primary coil.

No

No No

Replace

primary coil.

Is 120 volts

present on terminals

A and 7 of ignition

relay?

Replace

relay.

Yes

Replace

secondary

coil.

44 70410501

Is gap between

igniter and burner

1/8 to 1/4 inch?

Yes

No

Adjust igniter gap to 1/8 to 1/4 inch.

TMB2157S

31. Igniter Does Not Glow – White Rodgers Glow-Bar System

Igniter does not glow –

White Rodgers

Glow-Bar System

Is 80 - 120

volts present

between black wire

and ground on main

thermostat?

Yes

No

Check heat

circuit.

Troubleshooting

Is 80 - 120

volts present

between red and white

wires of igniter

bracket?

No

Is 80 - 120

volts present

between each of the

purple wires of

sensor and

ground?

Yes

No

Replace

igniter.

Replace diode

logic board.

TMB2158S

70410501 45

Troubleshooting

32. Igniter Glows, Cycles Off But Burner Does Not Ignite – White Rodgers Glow-Bar System

Igniter glows, cycles off

but burner does not ignite

– White Rodgers Glow-Bar System

Is 80 - 120 volts

present across the red

and white wires of the

redundant coil?

Yes

Can you hear

the redundant coil

open?

Yes

No

Replace diode

logic board.

Replace

complete gas

valve.

Can you hear

the main coil

click open?

Yes

Is the gap between

igniter and burner

1/8 to 1/4 inch?

No

Replace

main coil.

Adjust igniter

gap to

1/8 to 1/4 inch.

Is 40 - 60

volts present across

the purple wires to

the main coil?

Yes

46 70410501

No

Replace diode

logic board.

TMB2159S

Troubleshooting

33. Igniter Sparks, No Main Burner Ignition – Instant Electronic Ignition

Igniter sparks, no

main burner ignition –

Instant Electronic Ignition

Is igniter

sparking?

Yes

Is green wire

from IEI control

connected to

ground terminal?

Yes

Is gas

shut-off valve

turned on?

No

Connect green

No

wire to ground

Open gas

shut-off valve.

terminal.

Is IEI control in

safety lockout reset

by opening and

closing door?

No

Is resistance of

high voltage lead

greater than 25,0000

ohms or less than

5,000 ohms?

No

Yes

Open and

close door.

Replace high

voltage lead.

Is

Yes

igniter gap not

5/32 inch (.397 cm)

or is ceramic

Yes

Re-gap or

replace igniter.

cracked?

Is 120 volts

present on black

wire from IEI

No

Replace IEI

control.

No

control?

Replace IEI

control.

Yes

Check gas valve coils and

replace as required.

70410501 47

TMB2160S

Troubleshooting

34. CSH OM Models: No Heat With Cycle Selected, Unit Running and Calling For Heat

120 Volt/60 Hertz/1 Phase and 208-240 Volt/60 Hertz/1 Phase Nonreversing 208-240 Volt/60 Hertz/3 Phase and 460-480 Volt/60 Hertz/3 Phase Reversing and Nonreversing

CSH OM Models:

No heat with cycle selected,

unit running and calling for heat

Is there voltage

at H2-13?

No

Replace

micro control.

Is there

voltage to the

output of the motor relay?

No

Replace

motor relay.

Yes

Is there voltage

at H2-6?

Correct wiring

between H2-6

and H2-13.

Correct wiring between

CR1 and motor relay.

1 Phase

Only: Is

there voltage

to terminal 3

of CR1?

No

Yes

Check for proper thermistor

micro control if necessary.

Is there

voltage

at H2-5?

No

operation. Replace

Correct wiring to

motor switch.

No

3 Phase

Only: Is

there voltage

to the input of

the motor

switch?

Yes

Is there

voltage to the

input of the motor

relay?

No

Correct wiring between

motor relay and

micro control.

Replace

motor.

No

Is there

Yes

voltage to the

output of the

motor switch?

Yes

Is there voltage

to terminal 5

of CR1?

Yes

48 70410501

No

Is there

voltage to

terminal 3 of

the motor?

No

Replace

motor.

Yes

Is there

voltage across

the coil

of CR1?

No

Correct wiring

to CR1.

Does CR1

operate?

No

Replace

CR1.

Yes

Continued on

Troubleshooting

34. CSH OM Models: No Heat With Cycle Selected, Unit Running and Calling For Heat (continued)

120 Volt/60 Hertz/1 Phase and 208-240 Volt/60 Hertz/1 Phase Nonreversing 208-240 Volt/60 Hertz/3 Phase and 460-480 Volt/60 Hertz/3 Phase Reversing and Nonreversing

Continued from

voltage across

the steam valve coil?

Yes

Unit operational. If

unit still doesn’t heat,

check steam supply.

No

Correct wiring to

steam valve coil.

TMB2161S-b

70410501 49

Troubleshooting

35. OM Models: No Start With Cycle Selected, Start Button Pressed and Door Closed

120 Volt/60 Hertz/1 Phase CG & CSH Nonreversing; 208-240 Volt/60 Hertz/1 or 3 Phase CSH Nonreversing; 208-240 Volt/60 Hertz/3 Phase CE Nonreversing; 460-480 Volt/60 Hertz/3 Phase CG, CE and CSH Nonreversing

OM Models: No Start with

cycle selected, start button

pressed and door closed

Is there voltage to the primary of the

transformer?

Yes

Is there

24 VAC across

terminals 2 & 3 of

transformer

secondary?

Yes

Is there

voltage to the

COM terminal of the

door switch?

Correct wiring to

No

transformer

primary. Check

Correct wiring between door

fuses.

Replace

transformer.

switch and transformer. Check fuses.

Is there

voltage to terminal

H2-8 on the micro

control?

Yes

Is there

voltage at terminal

H2-7 on the micro

control?

Yes

Is there voltage

across the coil of

motor relay?

Yes

Correct wiring

No

between micro

No

micro control.

Correct wiring

No

between motor

micro control.

control and

door switch.

Replace

relay and

Yes

Is there voltage

Is there

voltage to the N.O.

terminal of the door

switch?

Yes

50 70410501

Check door switch

No

for proper

operation. Replace

if necessary.

to the input of the

motor relay?

Yes

Correct wiring

No

between motor

supply voltage.

Continued on

TMB2162S-a

Troubleshooting

35. OM Models: No Start With Cycle Selected, Start Button Pressed and Door Closed (continued)

120 Volt/60 Hertz/1 Phase CG & CSH Nonreversing; 208-240 Volt/60 Hertz/1 or 3 Phase CSH Nonreversing; 208-240 Volt/60 Hertz/3 Phase CE Nonreversing; 460-480 Volt/60 Hertz/3 Phase CG, CE and CSH Nonreversing

Continued from

voltage to the

output of the motor relay?

Yes

Is there

voltage across

terminals 1 and 4

of the motor for

single phase units

or L1, L2 and L3

of three phase

units?

Yes

No

Replace

motor relay.

Correct wiring

between motor

and motor relay.

Does the

motor operate?

Yes

Unit

operational.

70410501 51

No

Replace motor.

TMB2162S-b

Troubleshooting

36. OM Models: No Display After Selecting One Of The ON/SELECT Keys

120 Volt/60 Hertz/1 Phase CG and CSH Nonreversing; 208-240 Volt/60 Hertz/1 Phase CG and CSH Nonreversing; 208-240 Volt/60 Hertz/3 Phase CG and CSH Reversing/Nonreversing; 208240 Volt/60 Hertz/3 Phase CE Reversing/Nonreversing; 460-480 Volt/60 Hertz/3 Phase CG, CE and CSH Reversing/Nonreversing

OM Models: No display

after selecting one of the

ON/ SELECT keys

Is there voltage

aross the primary of

the transformer?

Yes

Is there 24 VAC

across terminals 1 & 4

of transformers

secondary?

Yes

Correct wiring

No

transformer and

supply voltage.

Check fuses.

No

Replace

transformer.

between

Is there voltage

to the opposite side

of the fuse on the

micro control?

Yes

Replace

micro control.

No

it is not blown.

Check fuse

making sure

Replace if

necessary.

Is there 24 VAC

across terminals H3-3

and H3-4 on the

micro control?

Yes

Is there voltage to the input of the fuse on the micro

control?

Yes

52 70410501

Correct wiring

No

between H3 and

transformer. Check fuses.

Replace

No

micro

control.

TMB2163S

Troubleshooting

37. CE OM Models: No Heat With Cycle Selected, Unit Running and Calling For Heat

208-240 Volt/60 Hertz/3 Phase and 460-480 Volt/60 Hertz/3 Phase Reversing and Nonreversing

CE OM Models: No heat

with cycle selected, unit

running and calling for heat

Is there

voltage

at H2-13?

No

voltage to

terminal 13 of

the motor

relay?

Replace

micro control.

Yes

No

Replace

motor relay.

Yes

Is there voltage

at H2-6?

Yes

Is there voltage

at H2-5?

Yes

Is there

voltage to

terminal 14 of

the motor

relay?

Yes

No

Correct wiring between H2-6

and H2-13.

Check for proper

thermistor operation.

Replace micro if

necessary.

No

Correct wiring

between motor

relay and

micro.

Is there

voltage to the

fan motor

switch?

Yes

Is there

voltage at the

output of the

fan motor

switch?

Yes

Is there

voltage to the

input of the

cabinet limit?

Yes

Correct wiring

No

Continued on

between

motor switch

and motor

Replace

fan motor.

Correct wiring

between

cabinet limit

and fan

motor.

TMB2164S-a

70410501 53

Troubleshooting

37. CE OM Models: No Heat With Cycle Selected, Unit Running and Calling For Heat (continued)

208-240 Volt/60 Hertz/3 Phase and 460-480 Volt/60 Hertz/3 Phase Reversing and Nonreversing

Continued from

voltage to the

output of the

cabinet

limit?

Yes

Is there

voltage to the

COM terminal

of the airflow

switch?

No

Check for proper airflow. Replace

cabinet limit.

Correct wiring

between airflow

switch and

cabinet limit.

Is there

voltage

to HC1?

Yes

Is there

voltage to

terminals T1, T2

and T3 of

HC1?

Yes

No

Correct

wiring

to HC1.

Correct wiring between HC1

and supply.

Yes

Is there

voltage to the

N.O. terminal

of the airflow

switch?

Yes

Is there

voltage to the

input of the

stove limit?

Yes

Is there

voltage to the

output of the

stove limit?

No

Correct wiring

between stove

limit and airflow

Check for proper

airflow. Replace

airflow switch.

switch.

Check for proper

airflow. Replace

stove limit if

necessary.

Is there

voltage to terminals

L1, L2 and L3 of

HC1?

Yes

Is there

voltage across the

elements?

Yes

Do the

elements produce

heat? NOTE: If

elements are glowing a

bright red/orange, there

is not enough

airflow.

No

Replace

HC1.

Correct wiring

to the

elements.

Check for

opens or

shorts in the

elements.

Yes

54 70410501

Unit

operational.

TMB2164S-b

Troubleshooting

38. CG OM Models: No Heat With Cycle Selected, Unit Running and Calling For Heat

120 Volt/60 Hertz/1 Phase and 208-240 Volt/60 Hertz/1 Phase Nonreversing 208-240 Volt/60 Hertz/3 Phase and 460-480 Volt/60 Hertz/3 Phase Reversing and Nonreversing

CG OM Models: No heat with

cycle selected, unit running and

calling for heat

Is there

voltage

at H2-13?

No

Replace

micro control.

Is there

voltage to the

output of the

motor

relay?

No

Replace

motor relay.

Yes

between H2-5 and H2-13 on the micro

Yes

Is there

voltage at H2-6

of the micro

control?

No

Correct wiring

control.

Correct wiring between

CR1 and motor relay.

1 Phase

Models: Is

there voltage

to terminal 3

of CR1?

No

Yes

Check for proper thermistor

operation. Replace micro

Is there

voltage at H2-5

of the micro

control?

No

control if necessary.

Correct wiring to fan

motor switch.

No

3 Phase

Models: Is

there voltage

to the input of

fan motor

switch?

Yes

Is there

voltage to input

of the motor

relay?

Correct wiring

between motor relay

and micro.

Replace

fan motor.

Is there

Yes

voltage out

from the

fan motor

switch?

Yes

No

Yes

Is there voltage

to terminal 5

of CR1?

70410501 55

Yes

Is there

voltage to

terminal 3 of

the motor?

No

Replace

motor.

Yes

Correct wiring between

Is there

voltage across

the coil

of CR1?

No

CR1 and motor.

Does CR1

operate

properly?

No

Replace

CR1.

Yes

Continued on

Troubleshooting

38. CG OM Models: No Heat With Cycle Selected, Unit Running and Calling For Heat (continued)

120 Volt/60 Hertz/1 Phase and 208-240 Volt/60 Hertz/1 Phase Nonreversing 208-240 Volt/60 Hertz/3 Phase and 460-480 Volt/60 Hertz/3 Phase Reversing and Nonreversing

Continued from

voltage to the

input of the

cabinet

limit?

No

Correct wiring

between cabinet

limit and CR1.

Is there

voltage to the

input of the

stove limit?

No

Yes

Is there

voltage to the

output of the

cabinet

limit?

No

Replace

cabinet limit.

Is there

voltage to the

output of the

stove limit?

No

Yes

voltage to

COM terminal

of the airflow

Correct wiring

between airflow

switch and cabinet

terminal 2 of

the ignition

Is there

switch?

No

limit.

Is there

voltage to

control?

No

Is there

Yes

voltage to the

N.O. terminal

of the airflow

switch?

Check for proper

operation and airflow.

Replace airflow

switch if necessary.

Does the

igniter

spark?

Yes

No

Yes

No

Correct wiring

between stove

limit and airflow

switch.

Is there

voltage at

terminal 1 of

the ignition

control?

No

Replace

ignition control.

56 70410501

Check for proper

airflow. Replace

stove limit if

necessary.

Yes

Is there

voltage across

the gas

valve?

No

Correct wiring

to gas valve.

Correct wiring

between ignition

control and

stove limit.

Yes

Check for gas flow and proper

gas pressure. Replace gas

Is there

a flame?

No

valve or coils of gas valve.

Check for proper gap on

igniter and check for

proper resistance of

ignition cable. Replace

Yes

if necessary.

Unit

operational.

TMB2165S-b

Troubleshooting

39.OM Models: No Fan Motor Rotation With Cycle Selected and Start Pressed

208-240 Volt/60 Hertz/3 Phase and 480 Volt/60 Hertz/3 Phase CE Reversing Models; 208-240 Volt/60 Hertz/3 Phase and 460-480 Volt/60 Hertz/3 Phase CG Reversing and CSH Models

OM Models: No fan motor

rotation with cycle selected

and start pressed

Is there

voltage across the

primary of the

transformer?

Yes

Is there

24 VAC across

terminals 2 & 3 of

the transformer

secondary?

Yes

Is there

voltage to the

COM of the door

switch?

Correct wiring to

No

transformer. Check fuses.

No

Replace

transformer.

Correct wiring

to door switch.

Check fuse.

Is there

voltage to H2-7 of

micro control?

Yes

Is there

voltage across

the coil of the

M contactor?

Yes

Is there

voltage to L1, L2

and L3 of the

M contactor?

Yes

No

Replace

micro control.

Correct the wiring

M contactor.

Correct wiring

between M

contactor and

supply voltage.

to the

Yes

Is there

voltage to the

N.O. terminal

of the door

switch?

Yes

Is there

voltage to H2-8

of micro

control?

Yes

70410501 57

Check door switch

and switch rod

No

for proper

operation. Replace

if necessary.

Correct wiring

No

between micro

control and door

switch.

voltage toT1, T2

and T3 of the

M contactor?

Yes

Is there

voltage across L1,

L2 and L3 of the

motor?

Yes

No

between motor

and M contactor.

Unit

operational.

Replace

M contactor.

Correct wiring

TMB2166S

Troubleshooting

40. MM Models: Fan Motor Does Not Run With Door Closed, Cycle Selected and Start Button Pressed

208-240 Volt/60 Hertz/3 Phase Gas and Steam Reversing and Nonreversing; 480 Volt/60 Hertz/ 3 Phase Gas Nonreversing; 480 Volt/60 Hertz/3 Phase Steam Reversing

MM Models: Fan motor

does not run with door

closed, cycle selected and

start button pressed

Is there

voltage to the COM

of the door

switch?

Yes

Is there

120 VAC to the

N.O. terminal of the

door switch?

Yes

Is there 120 VAC

to terminal P2 of the

micro control?

Correct wiring

between door switch and L1

supply for 208-240

No

Volt units. Check

between door

switch and X1 of

transformer for 480

Volt units.

Check for proper

No

operation of

door switch arm

and/or replace

door switch.

Correct wiring

between door

switch and

micro control.

Is there

120 VAC across

the coil of the motor

contactor?

Yes

Is there

voltage to terminals

L1, L2, and L3 of

motor contactor?

Yes

Is there

voltage at

terminals T1, T2

and T3 of the M

contactor?

Correct wiring to

No

the coil of motor

contactor.

Correct wiring

No

between motor

contactor and

terminals L1, L2,

L3 and TB1.

No

Replace motor

contactor.

Yes

Is there

120 VAC to

terminal P1 of the

micro control?

Yes

No

Replace

micro control.

Is there

voltage to L1,

L2 and L3 of

motor?

Yes

Replace

motor.

Correct wiring

No

between motor

and motor

contactor.

TMB2167S

NOTE: Make sure fuse on x1 of transformer is operational (240 Volt and 480 Volt/60 Hertz/3 Phase units).

58 70410501

Troubleshooting

41. MM Models: Cylinder Motor Does Not Run or Reverse With Door Closed, Cycle Selected and Start Button Pressed In Reversing Mode or Nonreversing Mode

480 Volt/60 Hertz/3 Phase Steam Reversing and 208-240 Volt/60 Hertz/3 Phase Gas and Steam Reversing Models

MM Models: Cylinder

motor does not run or

reverse with door closed,

cycle selected and start

button pressed in

reversing mode or

nonreversing mode

Is there

120 VAC across the

coils of the motor

contactor?

Correct wiring to

No

the coil of motor

contactor.

Is there120 VAC

to the COM terminal

of the door switch?

Yes

Is there 120 VAC

to the N.O. terminal of

the door switch?

Yes

Is there 120 VAC

to terminal P2 of the

micro control?

Yes

Is there 120 VAC

to terminal P1 of the

micro control?

Correct wiring

between door switch and L1

No

supply for 208-240

Volt units. Check

transformer on

480 volt.

Check for proper

operation of door

No

switch arm and/or

replace door

switch.

Correct wiring

No

between door

switch and micro

control.

No

Replace

micro control.

Yes

Is there

voltage to terminals

L1, L2, and L3 of motor

contactor?

Yes

Is there

voltage at terminals

T1, T2 and T3 of the

M contactor?

Yes

Is there

voltage to terminals

T1, T2, T3 on the forward

contactor and voltage to terminals U, V and W on

the reversing

contactor?

Correct wiring

No

between motor

contactor terminals

and L1, L2, L3

of TB1.

No

Replace motor

contactor.

Correct wiring

between forward

contactor and

motor contactor

No

and/or correct

wiring between

reverse contactor

and motor contactor.

Yes

Continued on

NOTE: If the unit will not reverse when reversing is selected, check for proper operation and wiring of reversing switch. Replace if necessary.

70410501 59

Troubleshooting

41. MM Models: Cylinder Motor Does Not Run or Reverse With Door Closed, Cycle Selected and Start Button Pressed In Reversing Mode or Nonreversing Mode (continued)

480 Volt/60 Hertz/3 Phase Steam Reversing and 208-240 Volt/60 Hertz/3 Phase Gas and Steam Reversing Models

Continued from

voltage to L1, L2, L3 on

the forward contactor or

voltage to terminals X, Y

and Z on the reversing

contactor?

No

to L1, L2 and L3 at

Yes

Correct wiring between

cylinder motor and

forward or reversing

Is

there voltage

the cylinder

motor?

No

contactor.

Yes

Unit

operational.

Is there

voltage across the

coils of either the

forward or

reversing

contactor?

No

Is there voltage

at the CW or CCW

terminal on the solid

state timer?

No

Is there voltage

at L1 of the solid

state timer?

Replace either

Yes

the forward or

Correct wiring

Yes

solid state timer

and either the

reversing coil.

Yes

Replace solid

reversing

contactor.

between the

forward or

state timer.

Is there voltage

to the output of the

auxiliary contacts on the

motor contactor?

No

Is there voltage

to the input side of the

auxiliary contacts on the

motor contactor?

No

Correct wiring

between motor

contactor and

TB1-L1 supply.

Correct wiring

Yes

between motor

contactor and

solid state timer.

Yes

Replace motor

contactor.

No

TMB2168S-b

NOTE: If the unit will not reverse when reversing is selected, check for proper operation and wiring of reversing switch. Replace if necessary.

60 70410501

Troubleshooting

42. MM Models: No Heat With Cycle Selected, Unit Running and Calling For Heat

120 Volt/60 Hertz/1 Phase and 208-240 Volt/60 Hertz/1 Phase Gas and Steam Nonreversing 208-240 Volt/60 Hertz/3 Phase and 480 Volt/60 Hertz/3 Phase Steam Reversing and Nonreversing

MM Models: No Heat with

cycle selected, unit running

and calling for heat

Correct wiring

No

airflow switch

between

and stove

high limit.

Is there

voltage to COM

terminal of the micro control?

No

Correct wiring

between door

switch and

micro control.

Is there

voltage to the N.O.

terminal of the

airflow switch?

Yes

Is there

voltage to the

N.O. terminal

of the micro

control?

Yes - Steam Models

voltage to the

input of the stove

voltage to the output

Yes

Is there

high limit?

Yes

Is there

of the stove

high limit?

No

- Gas Models

No

Replace

micro control.

Correct wiring

between stove

high limit and

micro control.

Check for proper

airflow. If airflow is

good, replace stove

high limit.

Is there

voltage at COM

of the airflow

switch?

Yes

Is there

voltage to the

input of the cabinet

limit?

Yes

Is there

voltage to the

output of the

cabinet

limit?

proper airflow

No

and function of

switch. Replac e airflow switch

if necessary.

Correct wiring

No

cabinet limit.

Check for

airflow

to between

cabinet limit

and airflow

switch.

Replace

Yes

Continued on

TMB2169S-a

Troubleshooting

42. MM Models: No Heat With Cycle Selected, Unit Running and Calling For Heat (continued)

120 Volt/60 Hertz/1 Phase and 208-240 Volt/60 Hertz/1 Phase Gas and Steam Nonreversing 208-240 Volt/60 Hertz/3 Phase and 480 Volt/60 Hertz/3 Phase Steam Reversing and Nonreversing

Continued from

to terminal 3

of CR2?

Yes

Is there voltage

to L1 of IEI

board?

Yes

Is there voltage

across gas valve coils?

No

board and CR2.

No

Correct wiring

between IEI

Check wiring.

Replace IEI

board if

necessary.

Is there voltage

across the coil

of CR2?

Yes

Is there 120 VAC

on terminal 3

of motor?

Yes

Correct wiring between CR2

and motor.

No

Replace

CR2.

Replace

motor.

Is there voltage

Yes

Check

Is the igniter

sparking?

Yes

Is there gas flow

through the valve?

Yes

62 70410501

No

resistance of high voltage

lead (5k and

20k). Replace

if necessary.

Check for proper

gas pressure.

Replace gas valve

if necessary.

across the coil of the

steam valve?

Yes

Does the

unit heat?

Yes

Unit

operational.

No

Correct wiring

No

to steam

valve.

Check for proper

steam

supply. Replace

steam valve if

necessary.

TMB2169S-b

Troubleshooting

43. MM Models: No Heat With Cycle Selected, Unit Running and Calling For Heat

208-240 Volt/60 Hertz/3 Phase Gas Reversing

MM Models: No Heat with

cycle selected, unit

running and calling

for heat

Check for proper

Is

there voltage

to the COM terminal

of the micro

control?

Yes

No

Correct wiring between door

switch and micro

Is there voltage

to the output of the

stove limit?

control.

Yes

No

airflow and flame

pattern. Replace stove high limit if

necessary.

Is

there voltage

to the N.O. terminal

of the micro

control?

Yes

Is

there voltage

to the COM terminal

of the airflow

switch?

Yes

Is

there voltage

to the N.O. contact

of the airflow

switch?

No

Replace the

micro control.

Correct wiring

between airflow

switch and micro

control.

Check for proper operation of airflow switch and airflow.

Replace airflow

switch if necessary.

Is there voltage

to the input of the

cabinet high limit?

Yes

Is there

voltage to the output

side of the cabinet

high limit?

Yes

Is there

voltage to L1 of the

IEI board?

Correct wiring

No

between cabinet

high limit and stove

high limit.

Check for proper

No

airflow. Replace

cabinet limit if

necessary.

Correct wiring

No

between IEI board

and cabinet high

limit.

Yes

Is

there voltage

to the input of the

stove limit?

Yes

70410501 63

Correct wiring

No

between stove limit

and airflow switch.

Continued on

Troubleshooting

43. MM Models: No Heat With Cycle Selected, Unit Running and Calling For Heat (continued)

208-240 Volt/60 Hertz/3 Phase Gas Reversing

Continued from

there voltage

across V1 and V2

of the IEI

board?

Yes

Is there voltage across the coils of the

gas valve?

Yes

Does the

unit ignite?

Make sure unit is

No

not in flame

lockout. Replace

if necessary.

Correct wiring

between gas

valves and IEI

Continue to

next step.

IEI board

board.

Is there

a gas flow through

the valve?

Yes

Unit

operational.

Check to see if gas

line is on and that

No

the gas line was bled of air. Also, check for proper

gas pressure.

Yes

Check for proper

igniter gap. Check

Is there

a spark?

Yes

64 70410501

No

for proper

resistance of high

voltage lead, 5 k

to 25 k ohms.

TMB2170S-b

Troubleshooting

44. OM Reversing Models: No Cylinder Rotation or Reversing Capabilities

208-240 Volt/60 Hertz/3 Phase and 480 Volt/60 Hertz/3 Phase CE Models 208-240 Volt/60 Hertz/3 Phase and 460-480 Volt/60 Hertz/3 Phase CG and CSH Models

OM Reversing Models:

No cylinder rotation or

reversing capabilities

Is there

voltage to H2-8 terminal

of micro control?

Correct wiring

No

between micro

control and door

switch.

Is there

voltage across the

primary of the

transformer?

Yes

Is there

voltage across

terminals 2 & 3 of the

transformer

secondary?

Yes

Is there

voltage to the

COM of the door

switch?

Yes

No

transformer and

No

to door switch.

Correct wiring

between

supply voltage.

Check fuses.

Replace

transformer.

Correct wiring

Check fuses.

Yes

Forward

Rotation: Is there

voltage to H2-3

of micro

control?

Yes

Forward

Rotation: Is there

voltage across the

coil of the forward

relay?

Yes

Forward

Rotation: Is there

voltage to terminals L1,

L2 and L3 of

the forward

relay?

Yes

Make sure unit is

in the forward

No

portion of rotation.

Replace micro

control.

No

Correct the

wiring to the

relay.

Correct wiring between relay

and supply

voltage.

Is there

voltage to the N.O.

terminal of the door

switch?

Yes

70410501 65

No

Correct wiring

and check

fuses.

voltage to terminals T1,

Forward

Rotation: Is there

T2 and T3 of the

forward relay?

Yes

No

Continued on

Replace

forward relay.

Troubleshooting

44. OM Reversing Models: No Cylinder Rotation or Reversing Capabilities (continued)

208-240 Volt/60 Hertz/3 Phase and 480 Volt/60 Hertz/3 Phase CE Models 208-240 Volt/60 Hertz/3 Phase and 460-480 Volt/60 Hertz/3 Phase CG and CSH Models

Continued from

Forward

Rotation: Is there

voltage across L1,

L2 and L3 of

the motor?

Yes

Correct wiring

No

between motor

and forward

relay.

Rotation: Is there

voltage to terminals U, V

and W of the reversing

relay?

Yes

No

Replace

reversing

relay.

Reverse

Rotation: Is

there voltage to

H2-4 of micro

control?

Yes

Reverse

Rotation: Is

there voltage across

the coil of the reverse relay?

Yes

Reverse

Rotation: Is there

voltage to terminals X, Y

and Z of the reversing

relay?

Make sure unit

is in the reverse

No

portion of rotation.

Replace micro

control.

Correct the

No

wiring to the

Correct wiring

No

between relay

and supply

relay.

voltage.

Reverse

Rotation: Is there

voltage across L1, L2

and L3 of the

motor?

Yes

Does the

motor turn?

Yes

Does the

cylinder rotate?

Yes

Correct wiring

No

between motor

and reversing

No

between motor

relay.

Replace

motor.

Check drive

components

and cylinder.

Unit

Yes

66 70410501

operational.

TMB2171S-b

Troubleshooting

45. MM Models: No Display After Pressing the ON/SELECT Keys

120 Volt/60 Hertz/1 Phase and 208-240 Volt/60 Hertz/1 Phase Gas and Steam Nonreversing 208-240 Volt/60 Hertz/3 Phase and 480 Volt/60 Hertz/3 Phase Gas and Steam Reversing/ Nonreversing

MM Models: No display

after pressing the ON/SELECT keys

Correct wiring between TB1-L1

Is there

120 VAC across

COM and Neutral

(P3) terminals on

PC board?

No

and COM on PC board or

between TB1-N and P3 (Neutral)

on PC board for low voltage.

Correct wiring between COM on

PC board and X1 of transformer for

480 Volt/60 Hertz/3 Phase voltage.

Yes

Replace

PC board.

TMB2172S

NOTE: Make sure fuse on x1 line of transformer is operational. Used for 480 Volt/60 Hertz/3 Phase voltage.

NOTE: If unable to change settings, the keyboard has been manually locked out. To lock or unlock, press and hold the START pad and press TIME.

70410501 67

Troubleshooting

46. MM Models: Motor Does Not Run With Door Closed, Cycle Selected and Start Button Pressed

208-240 Volt/60 Hertz/3 Phase Gas and Steam Reversing and Nonreversing; 480 Volt/60 Hertz/ 3 Phase Gas Nonreversing; 480 Volt/60 Hertz/3 Phase Steam Reversing

MM Models: Motor does

not run with door closed,

cycle selected and start

button pressed

Is there voltage

to the COM of the

door switch?

Yes

Is there 120 VAC

to the N.O. terminal of

the door switch?

Yes

Is there 120 VAC

to terminal P2 of the

micro control?

Correct wiring between door switch and L1

supply for 208-

No

240 Volt units. Check between door switch and

X1 of transformer

for 480 Volt/3

Phase units.

Check for proper

operation of door

switch arm and/

or replace door

switch.

Correct wiring between door

switch and micro

control.

Is there 120 VAC

across the coil of

the motor contactor?

Yes

Is there voltage

to terminals L1, L2

and L3 of motor

contactor?

Yes

Is there voltage

at terminals T1, T2

and T3 of the M

contactor?

Yes

Correct wiring

No

to the coil

of motor

contactor.

Correct wiring

No

contactor and

terminals L1,

L2, L3 and

No

Replace

contactor.

between

motor

TB1.

motor

Yes

Is there 120 VAC

to terminal P1 of the

micro control?

Yes

No

micro control.

Is there voltage

to L1, L2 and L3

at motor?

Replace

Yes

Replace

motor.

Correct wiring

No

between

motor and

contactor.

motor

TMB2173S

NOTE: Make sure fuse on x1 of transformer is operational (480 Volt/60 Hertz/3 Phase units).

68 70410501

Troubleshooting

47. MM Models: Cylinder Motor Does Not Run or Reverse With Door Closed, Cycle Selected and Start Button Pressed In Reversing Mode or Nonreversing Mode

208-240 Volt/60 Hertz/3 Phase Gas and Steam Reversing and 480 Volt/60 Hertz/3 Phase Steam Reversing Models

MM Models: Cylinder motor

does not run or reverse with

door closed, cycle selected

and start button pressed in

reversing mode or

nonreversing mode

Is

there120 VAC

to the COM terminal

of the door

switch?

Yes

No

Correct wiring between door switch and L1

supply for

208-240 units.

Check

transformer on

480 Volt

machines.

across the coils of

to terminals L1, L2

Is

there 120 VAC

the motor contactor?

Yes

Is

there voltage

and L3 of motor

contactor?

No

Correct wiring

to the coil of

motor

contactor.

Correct wiring

between motor

contactor

terminals and L1,

L2, L3 of TB1.

Is

there 120 VAC

to the N.O. terminal

of the door

switch?

Yes

Is

there 120 VAC

to terminal P2 of

the micro

control?

Yes

Is

there 120 VAC

to terminal P1 of

the micro

control?

Check for proper

No

operation of door

switch arm and/

or replace door

switch.

Correct wiring

No

between door

switch and

micro control.

No

Replace

micro control.

Yes

Is

there voltage

at terminals T1, T2

and T3 of the M

contactor?

Yes

Is

there voltage

to terminals T1, T2, T3 on the forward contactor and voltage to terminals U, V and

W on the reversing

contactor?

Yes

No

Replace motor

contactor and motor

No

contactor and motor

Continued on

Correct wiring

between forward

contactor and/or

correct wiring

between reverse

contactor.

Yes

TMB2174S-a

NOTE: If unit will not reverse when reversing is selected, check for proper operation and wiring of reversing switch. Replace if necessary.

70410501 69

Troubleshooting

47. MM Models: Cylinder Motor Does Not Run or Reverse With Door Closed, Cycle Selected and Start Button Pressed In Reversing Mode or Nonreversing Mode (continued)

208-240 Volt/60 Hertz/3 Phase Gas and Steam Reversing and 480 Volt/60 Hertz/3 Phase Steam Reversing Models

Continued from

No

voltage to L1, L2

voltage across the

coils of either the

forward or reversing

voltage at the CW or

CCW terminal on the

L1, L2, L3 on the forward

contactor or voltage to

terminals X, Y and Z on

the reversing

contactor?

Is there

and L3 at

motor?

Yes

Is there

contactor?

No

Is there

solid state

timer?

No

Is

Yes

No

Yes

Correct wiring

between

cylinder motor

and forward or

reversing

contactor.

Replace either

the forward or

reversing

contactor.

Correct wiring

between the

solid state timer

and either the

forward or

reversing coil.

Is there

voltage at L1 of the

solid state

timer?

No

Is there

voltage to the output

of the auxiliary contacts

on the motor

contactor?

No

Is there

voltage to the input

side of the auxiliary

contacts on the motor

contactor?

No

Correct wiring

between motor

contactor and

TB1-L1 supply.

Unit

operational.

Yes

Correct wiring

Yes

contactor and

solid state

Yes

TMB2174S-b

Replace

solid state

timer.

between

motor

timer.

Replace

motor

contactor.

NOTE: If unit will not reverse when reversing is selected, check for proper operation and wiring of reversing switch. Replace if necessary.

70 70410501

Troubleshooting

48. MM Nonreversing Models: Motor Does Not Run With Door Closed, Cycle Selected and Start Button Pressed

120 Volt/60 Hertz/1 Phase Gas and Steam; 208-240 Volt/60 Hertz/3 Phase Gas; 480 Volt/60 Hertz/3 Phase Steam

NOTE: Voltage checks referenced to are for neutral unless stated otherwise.

MM Nonreversing Models:

Motor does not run with

door closed, cycle selected

and start button pressed

Is there

120 VAC to the

COM of the door

switch?

Yes

No

Correct wiring between door switch and L1 supply for low

voltage units.

Check between

door switch and x1

of transformer for

high voltage units.

Gas Models:

Is there 120 VAC

across the coils of

the CR1?

Yes

Gas Models:

Is there 120 VAC

to terminal 1

on CR1?

No

Correct wiring

to the coil of

Correct wiring

between terminal

1 and door switch.

CR1.

Is there

120 VAC to the N.O.

terminal of the door

switch?

Yes

Is there

120 VAC to

terminal P2 of the

micro control?

Yes

Is there

120 VAC to terminal

P1 of the micro

control?

Yes

Check for proper

No

operation of door

switch arm and/

or replace door

switch.

Correct wiring

No

between door

switch and

micro control.

No

Replace micro

control.

Yes

Gas Models:

Is there 120 VAC

to terminal 3

on CR1?

Yes

Gas Models,

120 VAC units: Is there

120 VAC across the

terminals 1 and 4 of

the motor?

Yes

Steam Models:

Is there 120 VAC

across M coil?

No

Replace

motor.

No

Replace

CR1.

Correct wiring

to motor.

Correct the

wiring to M coil.

Yes - Steam Models

Yes

70410501 71

Continued on

Troubleshooting

48. MM Nonreversing Models: Motor Does Not Run With Door Closed, Cycle Selected and Start Button Pressed (continued)

120 Volt/60 Hertz/1 Phase Gas and Steam; 208-240 Volt/60 Hertz/3 Phase Gas; 480 Volt/60 Hertz/3 Phase Steam

NOTE: Voltage checks referenced to are for neutral unless stated otherwise.

Continued from

120 VAC on terminal

L1 of the motor relay for

single phase units, or across

L1, L2 and L3 for three

phase units?

Yes

Is there

120 VAC on terminal

T1 of the motor relay for

single phase units, or across

T1, T2 and T3 for three

phase units?

Yes

Is there

120 VAC across the

terminals 1 and 4 of

the motor?

Yes

240 VAC units:

Is there 120 VAC to

terminal 1 of the

motor?

No

Replace

motor.

No

Correct wiring

between motor

and motor

relay and the

terminal block.

Replace motor

control relay.

Correct wiring

to motor.

Correct wiring

between motor

CR1.

Is there

240 VAC across

terminals 1 and 4 of

the motor?

No

Is there

120 VAC to terminal 8

of CR1?

Yes

Is there

120 VAC to terminal 7

of CR1?

Yes

Correct wiring

between

CR1-7 and

terminal 4 of

the motor.

Yes

No

Replace

motor.

Correct

wiring

between

CR1-8 and

L2.

Replace

CR1.

Yes

72 70410501

TMB2175S-b

Troubleshooting

49. CD Models: No Start With Vend Satisfied and Start Button Pushed

208-240 Volt/60 Hertz/3 Phase Gas Nonreversing

NOTE: All voltage checks are referenced to neutral unless stated otherwise.

CD Models: No start with

vend satisfied and start

button pressed in

Is

Correct wiring

No

between

contactor and

door switch.

motor

Is there

voltage to the COM

terminal of

switch A?

Yes

No

Correct wiring

between L1 and

switch A.

there voltage

to the input side of

the auxiliary contacts

on the motor

contactor?

Yes

Is there

voltage to the NC

terminal of

switch A?

Yes

Is there

voltage to the common

terminal of the

door switch?

Yes

With

the door closed,

is there voltage to the

N.O. terminal of the

door switch?

Yes

Check for proper

No

operation of

switch A. Replace

switch A if

necessary.

Correct wiring between door

switch and

switch A.

Check door switch

for proper

operation, replace

if necessary.

Is

there voltage

across the coil of

the motor control

contactor?

Yes

If

the start

button is released,

does the motor

contactor stay in

the made

position?

Yes

Is

there voltage

to L1, L2 and L3

of the motor

contactor?

Correct wiring

between motor

No

contactor and

Push-To-Start

operation of

No

Correct wiring

between motor

No

contactor and L1, L2 and L3

button.

Check for

proper

motor

contactor,

replace if

necessary.

supply.

Is

there voltage

to the input side of

the Push-To-Start

button?

Yes

70410501 73

No

Correct wiring between start

switch and door

switch.

Continued on

Yes

Troubleshooting

49. CD Models: No Start With Vend Satisfied and Start Button Pushed (continued)

208-240 Volt/60 Hertz/3 Phase Gas Nonreversing

NOTE: All voltage checks are referenced to neutral unless stated otherwise.

Continued from

there voltage

to T1, T2 and T3 of

the motor

contactor?

Yes

Is there voltage

to L1, L2 and L3

of the motor?

Yes

Is

the internal wiring

of the motor correct

for the supply

voltage?

No

Replace motor

Correct wiring

between motor

contactor and

Change the

accordingly.

Check for

proper

operation.

contactor if necessary.

motor.

wiring

Yes

Has the thermal

overload cycled? Allow

motor to cool and

recheck.

Yes

Unit

operational.

74 70410501

No

Replace

motor.

TMB2176S-b

50. CD Models: No Heat With Vend Satisfied and Unit Running

208-240 Volt/60 Hertz/3 Phase Gas Nonreversing

NOTE: All voltage checks are referenced to neutral unless stated otherwise.

CD Models: No heat

with vend satisfied

and unit running

Is there

voltage to the

input of the motor

switch?

No

Correct wiring to

the input of motor

to the N.O. terminal

switch.

Is

there voltage

of the airflow

switch?

Yes

No

Troubleshooting

Check for proper

airflow and function of the airflow switch.

Replace airflow

switch if

necessary.

Yes

Is there

voltage to the

output of the motor

switch?

Yes

Is there voltage

to the input of the

cabinet limit?

Yes

Is there voltage

to the output of the

cabinet limit?

No

Correct wiring

No

between cabinet

limit and motor

Check for proper

operation, replace

if necessary.

Replace

motor.

switch.

Is

there voltage

to the input of the

stove limit?

Yes

Is

there voltage

to the output of the

stove limit?

Yes

Is

there voltage

to the N.C. terminal

of switch B?

Yes

Correct wiring

No

stove limit and

airflow switch.

Check for

No

blockage and

proper airflow.

Replace stove

limit if necessary.

Correct wiring

No

between switch B

and stove limit.

between

Is

Yes

Is

there voltage

to the COM terminal

of the airflow

switch?

Yes

70410501 75

No

Correct wiring

between airflow

switch and

cabinet limit.

there voltage

to the COM terminal

of switch B?

Yes

Continued on

No

operation, replace

switch B if

necessary.

TMB2177S-a

Troubleshooting

50. CD Models: No Heat With Vend Satisfied and Unit Running (continued)

208-240 Volt/60 Hertz/3 Phase Gas Nonreversing

NOTE: All voltage checks are referenced to neutral unless stated otherwise.

Continued from

there voltage to

the input of the

adjustable bulb

thermostat?

Yes

Is

there voltage to

the output of the

adjustable bulb

thermostat?

Yes

Is there voltage

to the ignition

control board?

Correct wiring

No

thermostat and

No

Replace

adjustable bulb

thermostat.

Correct wiring

between IEI

board and

thermostat.

between

switch B.

Is there voltage

across V1 and V2 of

the IEI board?

Yes

Is there voltage

across the coils of the

gas valve?

Yes

Is there a

flame?

No

Yes

No

Correct wiring

No

between gas

valve and IEI

operational.

Replace

IEI board.

board.

Unit is

Is

Yes

Does the

igniter spark?

Yes

76 70410501

Check for proper igniter gaps and resistance for

high voltage lead. (Proper

gaps for igniter are 5/16

above burner and 5/32

No

between electrode and

grounding tab. The proper

resistance of the high

voltage lead is between

5,000 Ohms and 25,000

Ohms.)

there gas pressure

on the output side

of the gas

valve?

Yes

Check for proper gas

pressure. 3.5 water

column inches for Natural

Gas, 10.5 water column

inches for L.P. Gas.

No

Replace

gas valve.

TMB2177S-b

51. CD Models: No Heat With Vend Satisfied and Unit Running

120 Volt/60 Hertz/1 Phase and 240 Volt/60 Hertz/1 Phase Gas Nonreversing Models

CD Models: No Heat

with vend satisfied

and unit running

Is there

voltage on red wire

of the motor?

No

to the input side of

the stove high limit

Replace

motor.

Is

there voltage

thermostat?

Yes

No

Troubleshooting

Correct wiring

between stove

limit and airflow

switch.

Yes

Is

there voltage

to the input of

the cabinet

high limit?

Yes

Is

there voltage

to the output of the

cabinet high

limit?

Yes

Is

there voltage

to the COM terminal

of the airflow

switch?

Yes

Is

there voltage

to the N.O. terminal

of the airflow

switch?

Yes

No

Correct wiring

between cabinet

high limit and

Check for proper

operation.

Replace if

necessary.

Correct wiring

between airflow

switch and cabinet

high limit.

Check for proper

operation and

airflow. Replace

necessary.

motor.

switch if

Is

there voltage

to the output side of

the stove high limit

thermostat?

Yes

Is

there voltage

to the N.C. terminal

of switch B on the

coin drop?

Yes

Is

there voltage

to the COM terminal

of switch B?

Yes

Is

there voltage to the input side of the adjustable

thermostat?

Yes

Continued on

No

operation and airflow. Replace stove high limit if

necessary.

Correct wiring

between switch B

and stove high

Check for proper

operation of coin

drop. Replace

switch B if

necessary.

Correct wiring

between

switch B and

thermostat.

limit.

TMB2178S-a

70410501 77

Troubleshooting

51. CD Models: No Heat With Vend Satisfied and Unit Running (continued)

120 Volt/60 Hertz/1 Phase and 240 Volt/60 Hertz/1 Phase Gas Nonreversing Models

Continued from

there voltage

to the output side

of the adjustable

thermostat?

Yes

Is there

voltage to L1 of the

ignition control board

(IEI board)?

Yes

Does the

igniter spark?

Yes

Is there voltage

across V1 and V2

of the IEI board?

No

Check for proper gap on

igniter and check for proper

resistance of high voltage

lead. Replace lead if

necessary. (Proper gaps for igniter are 5/16 above burner and 5/32 between

electrode and grounding

tab. The proper resistance

of the high voltage lead is between 5,000 Ohms

and 25,000 Ohms.)

No

Replace

thermostat.

Correct wiring

between

ignition control

board and

thermostat.

Replace

IEI board.

Is there voltage

across the coils of

the gas valve?

Yes

Is there

a flame?

No

Is there

gas pressure on the

output side of the

gas valve?

Yes

Check for proper gas

pressure. 3.5 water

column inches for Natural Gas, 10.5

water column inches

for L.P. Gas.

Yes

Correct wiring

No

between gas valve and IEI

operational.

No

board.

Unit is

Replace

gas valve.

Yes

78 70410501

TMB2178S-b

Troubleshooting

52. CD Models: No Start With Vend Satisfied and Start Button Pushed

240 Volt/60 Hertz/1 Phase Gas Nonreversing

NOTE: All voltage checks are referenced to neutral unless stated otherwise.

CD Models: No start with

vend satisfied and start

button pushed

Is there

voltage to

the N.C. terminal

of switch A?

No

Correct wiring

between L1

on TBI and

switch A.

Is there

voltage across

the coil of the

control relay

(CR)?

Yes

Correct wiring

No

to the control

relay.

Yes

Is there

voltage to

COM terminal of

switch A?

Yes

Is there

voltage to COM

terminal of the

door switch?

Yes

Check for proper

No

operation of

switch A. Replace

switch A if

necessary.

Correct wiring between door

switch and switch

A of the rotary

coin drop.

Is there

voltage to terminal 5

of the motor?

Yes

Is there

voltage to the

input side of the

start switch?

Yes

With the

start button pressed in,

is there voltage to the

output side of the start

button?

No

Correct wiring

between

motor and

door switch.

Correct wiring

between start

switch and

door switch.

Replace start

switch.

No

Check door

switch for

proper

operation,

replace if

necessary.

Yes

Continued on

With the door

closed, is there voltage

to the N.O. terminal

of the door

switch?

Yes

NOTE: If motor only runs with start switch pressed in, that means centrifugal switch in motor is bad. Replace motor.

70410501 79

Troubleshooting

52. CD Models: No Start With Vend Satisfied and Start Button Pushed (continued)

240 Volt/60 Hertz/1 Phase Gas Nonreversing

NOTE: All voltage checks are referenced to neutral unless stated otherwise.

Continued from

voltage to terminal 1

of the control

relay?

Yes

Is there voltage

to terminal 3 of

the control

relay?

Yes

Is there

voltage to terminal 1

of the motor?

Correct wiring to

No

terminal 1 of the

control relay.

Check for

No

proper

operation.

Replace

control relay if

necessary.

Correct wiring

between

motor and

start switch.

Yes

No

Does the

motor run?

Yes

Unit

operational.

Replace the

motor.

TMB2179S-b

NOTE: If motor only runs with start switch pressed in, that means centrifugal switch in motor is bad. Replace motor.

80 70410501

Troubleshooting

53. CD Models: No Start With Vend Satisfied and Start Button Pushed

120 Volt/60 Hertz/1 Phase Gas Nonreversing

NOTE: All voltage checks are referenced to neutral unless stated otherwise.

CD Models: No start with

vend satisfied and start

button pushed

Is there

voltage to

terminal 5 of

the motor?

Correct wiring

No

between

motor and

door switch.

Is there

voltage to

the N.C. terminal

of switch A?

Yes

Is there voltage

to COM terminal

of switch A?

Yes

Is

there voltage

to COM terminal

of the door

switch?

Yes

No

Correct wiring

between L1 on

TBI and

switch A.

Check for proper

operation of

switch A.

Replace switch A

if necessary.

Correct wiring between door

switch and switch

A of the rotary coin

drop.

Yes

Is there

voltage to the input

side of the start

switch?

Yes

With the

start button pressed

in, is there voltage to the

output side of the start

button?

Yes

Is there

voltage to

terminal 1 of

the motor?

No

Correct wiring between start

switch and

door switch.

Replace start

switch.

Correct wiring

between

motor and

start switch.

Yes

No

Check door

switch for

proper

operation,

replace if

necessary.

Does the

motor run?

Yes

No

Unit

operational.

Replace the

motor.

TMB2180S

With the

door closed, is there voltage to the N.O. terminal of the

door switch?

Yes

NOTE: If motor only runs with start switch pressed in, that means centrifugal switch in motor is bad. Replace motor.

70410501 81

Section 4

Adjustments

WARNING

To reduce the risk of electric shock, fire, explosion, serious injury or death:

• Disconnect electric power to the tumbler before servicing.

• Close gas shut-off valve to gas tumbler before servicing.

• Close steam valve to steam tumbler before servicing.

• Never start the tumbler with any guards/panels removed.

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

W002

54. Cylinder Clearance

The clearance between the cylinder rim and front panel must be adjusted so the cylinder is centered within the front panel opening when the cylinder is fully loaded and is turning. However, the adjustment should be made when the cylinder is empty.

NOTE: If the cylinder is not properly adjusted, the cylinder rim will rub against the front panel.

a. Open loading door and check the gap between

the center of the front panel top flange and the cylinder rim. Proper adjustment is when the

gap is 7/16 inch (11 mm). Refer to Figure 1. b. Remove chain guard. c. Loosen the four trunnion housing bolts. Refer

to Figure 2. d. Loosen the locknuts on the trunnion housing

adjusting bolts. Refer to Figure 2.

e. Turn the adjusting bolts in or out as necessary

to obtain proper clearance between cylinder rim and front panel.

NOTE: Turning the adjusting bolts clockwise will raise the cylinder and turning them counterclockwise will lower the cylinder. Turn both bolts evenly to adjust top and bottom clearance. Turn one or the other adjusting bolt in or out to adjust side clearance.

f. After the cylinder is properly adjusted, tighten

the adjusting bolt locknuts and the four trunnion housing bolts.

g. Install the chain guard removed in step “b”.

NOTE: If adjusting the trunnion housing fails to correct the clearance, the problem is probably due to a worn trunnion shaft or defective bearings.

Cylinder

Rim

7/16 Inch

(11.113 mm)

Gap

Front Panel

Figure 1

82 70410501

Front Panel

Top Flange

T057P

BELT/CHAIN NONREVERSING

Trunnion

Housing

Bolts

(2 per side)

Locknuts

Adjustments

Trunnion Housing

Adjusting Bolts

TU202-PT

Figure 2

70410501 83