Thermador SMW272YB, SMW272YW, SMW272YS, SMW272YP Training Program

1

SMW

Series

Oven

Training

Program

SMW

Series

Oven

Training

Program

2

SMW Series Oven Training Program

SMW Series Oven

Training Program

➤

Installation

➤

Features and Operation

➤

Model Numbers

➤

Warranty

➤

Component Description and Access

➤

Error Codes

➤

How the Oven Works….Microwave Section

➤

How the Oven Works….Warming Drawer Section

➤

How the Oven Works….Lower Convection Oven

➤

Service Tips

3

Installation

Electrical Power Connection

•• Requires four wire supply L1, L2, Neutral and a bare ground

Requires four wire supply L1, L2, Neutral and a bare ground

•• 30 amp circuit breaker

30 amp circuit breaker

•• Unit is dual-rated, 120/208-240 volts

Unit is dual-rated, 120/208-240 volts

Cut-out Dimensions

•• Height 55-3/8 inches

Height 55-3/8 inches

•• Width 25-1/2 inches

Width 25-1/2 inches

•• Depth 24 inches

Depth 24 inches

•• Floor to cutout 9-3/4 inches

Floor to cutout 9-3/4 inches

4

Installation…continued

•• Electrical conduit box

Electrical conduit box

The preferred location

would be to install it 2-1/2 inches above the unit, in

the center of the cabinet. However it may be

placed approx. 5 inches below cabinet base.

•• Cabinet base

Cabinet base

must be capable of supporting the

weight of the unit, approx. 250 pounds.

•• Frame

Frame

of oven overlaps the cabinet by 5/8 inch.

•• Oven

Oven

should be installed in such a manner that it

can be easily removed for service

•• Internal

Internal

ventilation system

5

Features and Operation

➤

Upper oven

features a 2.1 cubic foot microwave

➤

1100 watts of power with sensor cooking & 10 power levels

➤

Language choice for display: English, French & Spanish

➤

Weight can be displayed in either Lbs...or Kgs.

➤

Child lock-out feature

➤

Demo mode on/off for retail store display

➤

Auto popcorn feature, can be pre-set according to weight

➤

Middle oven

is a warming drawer keeps food at desired

temperature until ready to serve: Temperature controls are from

a high of 240F to a low of 140F

6

Features and Operation

➤

Lower oven

is a S Series convection oven with 4 modes of

cooking

➤

Bake, Variable Broil, Convection and Convection Roast

➤

Sense-A-Touch glass control panel

➤

Halogen oven lights

➤

Large viewing window

➤

Two separate timers

➤

Timed cooking mode

➤

Six adjustable rack positions

➤

Oven comes with 3 racks

➤

Rack supports are porcelain & removable

7

Features

➤

Oven & door liner...fine grain porcelain

enamel

➤

Two 10W 12VAC Halogen lights per

cavity

➤

Equivalent to a 60W incandescent

bulb

8

Features and Operation

➤

Panel Lock (child lockout)

➤

A 12 or 24 hour clock option

➤

Centigrade or fahrenheit temperature display

➤

3 Specialty Modes

➤

Proof

➤

Cycles bake circuits at 100 degrees

➤

Dehydrate…

➤

Cycles convection circuits at 140 degrees

9

Features and Operation

➤

Sabbath….

➤

only available in bake cycle

➤

element indicator light cycles with heat

➤

all other keys/functions are dead except off key

10

Model Numbers

➤

27” Integrated Electric Oven, Warming Drawer &

Microwave Oven

➤

4 Models

➤

SMW272YB………Black Glass

➤

SMW272YW………White Glass

➤

SMW272YS……….Stainless Steel

➤

SMW272YP……….Stainless Steel with Pro

Stainless steel handle

11

Model Numbers ….

Continued

27” Integrated Electric Oven & Microwave

Oven

3 Models

••SM272YB……………..Black Glass

SM272YB……………..Black Glass

••SM272YW…………….White Glass

SM272YW…………….White Glass

••SM272YS……………..Stainless Steel

SM272YS……………..Stainless Steel

Built-In Microwave Oven

3 Models

••MBYB………………….Black

MBYB………………….Black

••MBYW…………………White

MBYW…………………White

••MBYS………………….Stainless Steel

MBYS………………….Stainless Steel

12

Model Numbers

Example….SMW272YB

Model Numbers

Example….SMW272YB

➤

S =

S-Series convection oven

➤

M =

Microwave oven

➤

W =

Warming drawer

➤

27 =

27” Oven

➤

2 =

Double oven

➤

Y =

2000 Introduction Year

➤

The Y designates a change in

form & finish

(appearance)

from previous designated year

➤

The serial number is used to denote a change in internal

components

➤

B =

Black

13

Warranty

➤

One full year

from date of installation or

occupancy

➤

Service must be performed

by an

authorized service agent

➤

Warranty Claim

must be submitted within 45

days of completion

14

➤

Microwave section

➤

Microwave vent-cover

➤

Touch control door assembly… includes

membrane

switch & DPC

(

Digital Programmer Control)

➤

Inverter board

➤

Lamp & mag tube

➤

Stirrer motor

➤

How the microwave circuit works

➤

Troubleshooting

Microwave Oven Section

…..

component description & access

15

Microwave Section…Removal

Microwave Section…

Removal

➤

To gain access to the

microwave section

➤

Remove vent frame from

around the microwave

unit. This frame is a one

piece construction

➤

Grasp the frame and pull

the ball studs from the

spring catches

15

16

Microwave Section…Removal

Microwave Section…

Removal

➤

Remove the 2 screws

which hold the microwave

base to the oven housing

➤

Remove the spring catches,

which are secured with

two screws

➤

Bow out the side of outer

frame slightly to allow the

section to slide out easily

16

17

Microwave Section…Removal

Microwave Section…

Removal

➤

Before removing

section, remove

warming drawer to

avoid scratching

➤

Slide tabs on both

sides of rails and

drawer will pull out

17

18

Microwave Section…Removal

Microwave Section…

Removal

➤

Slide section part way

out leaving the right

rear corner still inside

housing

➤

While holding front of

unit reach inside and

unplug the section

from the receptacle

18

19

Microwave Section …Removal

Microwave Section …

Removal

➤

Section can now be

removed completely

and set down on a

solid surface

➤

Note the exhaust duct

covers on the top of

the microwave cover

19

20

Microwave Section…Access Duct Cover

Microwave Section…

Access Duct Cover

➤

To gain access to the

microwave components

the duct exhaust parts

must first be removed

from the microwave

cover

➤

The microwave cover can

then be removed

20

21

Microwave Section…Access Outer Cover

Microwave Section…

Access Outer Cover

➤

After removing the

screws from the sides

and rear, the cover slides

away from the front

allowing access to most

of the components.

➤

Note the groove on the

cover and the tab on the

front frame

22

Component Description & Access…Mag

tube & Mag tube thermal cutout

Component Description &

Access

…

Mag

tube & Mag tube thermal cutout

➤

Steam Sensor Location

( inside cover)

➤

Mag-tube thermal cutout

N/C opens at 221 deg. F

➤

Mag tube is secured with

four screws. Across

filament terminals should

read 1 Ohm or less.

Between each terminal

and ground should be

open

23

Component Description & Access….

Door switches and lamp assembly

Component Description &

Access….

Door switches and lamp assembly

➤

Lamp assembly

lamp is 20watts 120V

➤

Primary latch switch N/O

➤

Secondary latch switch N/O

& is the outside switch

➤

Monitor or short switch N/C

& is the inside switch

➤

Inverter board

23

24

Microwave Section….

Door Switch Locations & Adjustments

25

SMW Microwave switch & relay wiring

N/O

Switch

N/C

Switch

N/O Switch

CCN/O

N/O

W

B

GR

W

BL

B

OR

25

(R)

(W)

BR

(W) White (Y) Yellow (R) Red

26

Component Description &

Access….Fuse Temp. Sensor & Noise Filter

Component Description &

Access….Fuse Temp. Sensor & Noise Filter

➤

Fuse is rated at 18 amps

( regular cartridge fuse )

➤

Temperature sensor

measures 40,000 Ohms to

ground If excessive cabinet

temperature is detected

cooling fan will turn on

automatically until temp.

drops

(part # 35-00-778)

➤

Noise filter is across hot and

neutral incoming supply

(part #

35-00-786)

(Part # 35-00-787)

27

Component Description & Access…

Microwave Touch Control Door Assembly

Component Description &

Access…

Microwave Touch Control Door Assembly

➤

Before removing door

assembly

disconnect the four

plug connectors, the ribbon

connector and the two relay

plugs.

(all connection plugs are color

coded so that they can’t be mis-wired)

➤

To remove assembly

remove

the two screws from the top

and the single screw from the

side of the frame

➤

Door assembly

will then lift

up and out of the slots in the

frame

27

28

Component Description &

Access….High Voltage Inverter

Component Description &

Access….High Voltage Inverter

➤

To gain access to the Inverter

Power Supply Board

disconnect the mag tube HV

wires

➤

Unsnap the plastic air guide

from the tabs

➤

To remove board remove m/w

pan (4 screws at the corners &

3 across the rear) then the 3

screws which secure the board

28

29

Component Description &

Access…High Voltage Inverter Terminals

Component Description &

Access…High Voltage Inverter Terminals

➤

CN702

…120VAC

input to transformer

➤

CN701

…Signal

voltage from DPC

circuit (3 wire plug)

Voltage varies from 0

volts to 2.7VAC for

variable power levels

➤

CN703

…4000VDC

output to mag tube

30

Microwave Section….Inverter Power supply HV Area

Low Voltage Input from DPC 0-2.7

VAC ( see table on page 30)

120 VAC Input

High Voltage 4000 VDC

Output to Mag Tube

Note Do not attempt to repair this inverter

board. Replace as a complete asse mbly

Part # 35-00-789

31

Variable Power & Voltage readings from

DPC plug CN3

32

Component Description & Access…..

Stirrer Motor

Component Description &

Access…..

Stirrer Motor

➤

Remove base of unit or

break off access cover and

re-secure with screws

➤

Stirrer motor is held in

place with two screws

➤

Motor is a synchronous

type with a ‘D’ shaft and

operates off of 120VAC.

When replacing the motor

ensure that the shaft locates

into bearing insert.

(part # 35-00-779)

32

33

Component Description & Access….

Stirrer Motor

Component Description &

Access….

Stirrer Motor

➤

‘D’ Slot

➤

‘D’ Shaft

34

Microwave

Control Panel

35

SMW How the Oven works…Microwave section

CN2

CN4

CN3

33221

1

11223

3

Low Voltage Supply

controls variable power

Microwave door closed, short switch is open, primary

and secondary latch switches are closed. Unit is not

operating.

35

A

B

Note the oven lamp and

turntable motor circuits are

powered up when door is

opened, however only the

lamp has a neutral return

Orange

Red

Brown

36

SMW How the Oven works…Microwave section

CN2

CN4

CN3

33221

1

11223

3

Low Voltage Supply

controls variable power

Microwave door closed, short switch is open, primary

and secondary latch switches are closed. Unit is not

operating.

36

A

B

Note the oven lamp and

turntable motor circuits are

powered up when door is

opened, however only the

lamp has a neutral return

Red

Orange

Brown

37

SMW How the Oven works…Microwave section

CN2

CN4

CN3

33221

1

11223

3

Low Voltage Supply

controls variable power

Microwave on high, power relay coil ‘B’ is energized

constantly during each 22 second cycle while calling

for heat

37

A

B

Red

Orange

Brown

38

SMW How the Oven works…Microwave section

CN2

CN4

CN3

33221

1

11223

3

Low Voltage Supply

controls variable power

Microwave on, 20% power level, relay coil ‘B’ is energized 15

seconds on and 7 seconds off out of each 22 second cycle

while calling for heat

38

A

B

Red

Orange

Brown

39

Description of Operating Sequence

40

Description of Operating Sequence….

Sensor

Cooking & Sensor Reheat

42

Microwave Section…..Component Test Procedures

42

41

43

Troubleshooting Guide

44

Troubleshooting Guide…..continued

45

Microwave Section Troubleshooting HV Inverter

45

46

Troubleshooting HV Inverter…continued

47

48

Trouble Related to Digital Programmer Circuit….continued

49

50

Microwave Leakage Test….continued

51

Warming Drawer Section….

Features &

Benefits

••

On Indicator Light

can be

viewed through drawer front

••

450 Watt

Element

••

On/Off

Switch

••

Thermostat

has low, medium

& high settings. 140, 170, and

210 degrees F

••

Easy glide

drawer slides

52

Component Description &

Access

…

Element & Slides

Slides are

held in

place with

two screws

53

Component

Description &

Access….Element

& Slides

53

Part # 16-10-728

54

Component Description &

Access

…Thermostat & On light

Thermostat Control has three

settings….

Low..140 degrees F

Medium…170 degrees F

High…210 degrees F

Indicator light remains

illuminated the whole time the

unit is turned on, it does not

turn on and off with the cycles

of the thermostat

55

Component Description & Access...

Thermostat Switch and on lamp

To access controls

front frame of

warming drawer has

to be removed. Peel

back drawer gasket

and remove the 14

countersunk Phillips

screws. Pull off

thermostat knob and

remove frame

56

Thermostat,

switch, and the

‘on’ indicator

light can now be

accessed from

right side of unit.

This procedure is

also necessary to

replace drawer

gasket

(part # 14-07-381)

Component Description &

Access….

Thermostat switch on lamp & gasket

57

Component Description &

Access Switch & Thermostat

58

How the Oven works….

Warming Drawer

58

Unit in the off position

3.75 amps

Temperature Heat Settings

59

How the Oven works….

Warming Drawer

59

Unit in the on position,

thermostat contacts

cycling

3.75 amps

Temperature Heat Settings

60

Lower Oven Features

➤

“Field Sensor” touch control

➤

Digi-pad numeric control panel

➤

Centigrade or Fahrenheit temperature

display

➤

A 12 or 24 hour clock

➤

Child lock-out feature

➤

Bread proofing and Dehydration modes

➤

Large viewing door window

61

Features

➤

Third Element Convection

➤

Convection Roast mode

➤

Recessed 8 wrap broil element

➤

Internal ventilation system

➤

End of cycle chime

➤

To restore: Touch Upper oven “OFF” pad

for 10 seconds, until you hear the chime

62

…..and Operation

➤

Window Display

➤

Cook Time

➤

Timer 1

➤

Clock

➤

Stop Time

➤

Timer 2

➤

Oven Light

➤

Number Pads

➤

Bake

➤

Broil

➤

Convection

➤

Off

➤

Self Clean

➤

Convection Roast

63

…..and Operation Test Mode

…..and Operation

Test Mode

➤

Electronic oven control test mode

➤

Power up unit

➤

Do the following within 5 minutes, before

any other programming

➤

Hold the STOP TIME pad key for 10

seconds

➤

Unit will enter test mode

➤

Test the function key pads

64

…..and Operation Calibration

…..and Operation

Calibration

➤

Oven Temperature Calibration

➤

Touch BAKE pad

➤

Set Temperature between 500 and 550

➤

Hold BAKE pad for 4 seconds

➤

0 or last calibrated Temperature will display

➤

Touch BROIL pad to toggle between + and -

➤

From zero + or - 35 degrees calibration

possible

65

Component Description

➤

Lower Oven Relay

Board

➤

Control Panel

➤

Display Head

➤

Sensor

➤

Halogen Light

➤

Halogen Light

Transformer

➤

Cooling Fans

66

Component Description & Access….Plenum

Components

Component Description & Access….

Plenum

Components

Time delay fuse

rated at 20amp

Terminal Block

Stalled Fan Relay

coil is energized

by 120volts AC

from air switch.

Contacts transfer

120VAC from HTC

to DLB relay on

board (K8)

Halogen Light

Transformer.

Primary

Input120VAC

Secondary Output

12VAC

Control Panel

Display Head

(Clock)

Relay Board

(part # 16-20-101)

(Part # 14-38-608)

67

Component Description…Relay Board

Component Description…

Relay Board

K6 Cooling

Motor Relay

K9 Latch

Motor Relay

J2 Pin Connector Transfers

data between board, touch

panel & display head

J10 Pin Connector

Transfers signal voltage to

sensor

J5 Pin

Connector

Transfers

signal voltage

through the

latch switches

J1Pin

Connector

Power

Supply from

the board to

the display

head

20VAC to

illuminate it

and 12VDC

logic power

K4 Convection

Motor Relay

K1 Bake

Element

Relay

K2 Broil

Element

Relay

K3

Convection

Element

Relay

K8 Double

Line Break

Relay

K7 Light Relay

Powers Light

Transformer

(Part # 16-10-660)

68

Component Description

Lower Oven Relay Board….Relays

Component Description

Lower Oven Relay Board….Relays

K8…Line Break

K4…Convection Motor

K1…Bake Element

K9…Latch Motor

K2…Broil Element

K6…Cooling Motor

K3…Convection Element K7…Light Transformer

K8

K1K1K2

K2

K3

K4K4K9K9K6

K6

K7

J1J1J2

J2

J5

J8J8J10

J10J9J9

J7

L2

N

L1

69

Component Description

Lower Oven Relay Board…Pin connectors

Component Description

Lower Oven Relay Board…Pin connectors

K8

K1K1K2

K2

K3

K4K4K9K9K6

K6

K7

J1J1J2

J2

J5

J8J8J10

J10J9J9

J7

L2

N

L1

J1 is the power supply from the main relay board

20 VAC

to the display head to light it up (

contacts 3-4

contacts 3-4))

12 VDC

for logic power from relay board (

contacts 1-2

) into touch control

((contacts 3-4

contacts 3-4

) & then out from touch control (

contacts 1-2

) to the display

head (

contacts 1-2

contacts 1-2))

K8

70

Component Description

Lower Oven Relay Board…Pin connectors

Component Description

Lower Oven Relay Board…Pin connectors

K8

K1K1K2

K2

K3

K4K4K9K9K6

K6

K7

J1J1J2

J2

J5

J8J8J10

J10J9J9

J7

L2

J2…transfers data between relay board, touch control

& display head

L1

N

K8

71

Component Description….Lower Oven

Relay Board…Pin connectors

Component Description….

Lower

Oven

Relay Board…Pin connectors

K8

K1K1K2

K2

K3

K4K4K9K9K6

K6

K7

J1J1J2

J2

J5

J8J8J10

J10J9J9

J7

L2

N

L1

J5 … Transfers signal voltage through the latch switches

J10 …Transfers signal voltage to sensor

Note

Since this is a single S oven pin connectors J7,J8 and J9

are not used

K8

72

Component Description

Touch Control Panel

Component Description

Touch Control Panel

➤

Contains 22 touch

control pads

➤

Touching the glass

disturbs the

electromagnetic field

➤

Touching the glass

programs the oven

Four pin plug

contacts1-2 & 3-4

read 12 VDC

17 Pin Connector to

the Display Head

73

Touch Control Panel

• Electromagnetic field effect

• NOT membrane

• NOT capacitive

• 22 control pads

• Programmable

74

Testing the touch control panel

➤

Test points on touch control panel

➤

One point is marked with a minus

➤

Other point is marked with a plus

➤

Remove conforming coating on surface of

pads

➤

Test for voltage between points

➤

0VDC when pad not being touched

➤

5VDC when pad is being touched

75

Component Description...Display Head

Displays

the

program

function

selected

17 Pin

Connector

to the

Touch

Control

Panel

4 Pin plug is

the 12 VDC &

20 VAC

power supply

8 Pin plug

data transfer

between

Display

Head &

Relay Board

76

Component Description

Sensor

Component Description

Sensor

➤

1050 OHMS at room

temperature

➤

Ohm out leads at

relay board

➤

F3 = open sensor

circuit

➤

F4 = short in sensor

circuit

(part # 35-00-306)

77

Component Description

Halogen Lights

Component Description

Halogen Lights

➤

Activated by 12VAC fr om

transformer

➤

Comes on when light pad is

selected

➤

Comes on when door is

opened

➤

Don’t touch bulb with

fingers use a tissue as

grease from fingers can

shorten the life of the bulb

10 Watt bulb

(part # 14-38-551)

78

Component Description

Halogen Light Transformer

Component Description

Halogen Light Transformer

➤

Step down Transformer

➤

120VAC to 12VAC

➤

Activated by relay K7 on

main relay board

➤

Supplies voltage for

halogen lights

(part # 14-38-517)

Secondary

winding

Primary

winding

79

Component Description

Cooling Fan

Component Description

Cooling Fan

➤

Is energized by K6 relay

when

ever a cooking mode or self-

clean is selected. Continues to

run after oven is turned off until

cavity temperature drops below

200 degrees F for a cooking

mode & 538 degrees F for self-

clean mode. This auto-run

feature is controlled by the

sensor

➤

Oven Blower

…is 80 CFM at

outlet

(part # 14-38-515)

80

Air flow pattern

➤

Natural air enters oven frame at vent holes on both

sides as well as through front grills on oven frame

➤

Action of blower

➤

Moves air across halogen light housings

➤

Pulls air up through doors into plenum area

➤

Air exits out rear of oven into channel

➤

Air exhausted out front at bottom of oven on left side

81

Lower Oven….any questions at this

point?

Lower Oven….any questions at this

point?

➤

Oven Relay Board

➤

Control Panel

➤

Display Head

➤

Sensor

➤

Halogen Light

➤

Halogen Light

Transformer

➤

Cooling Fans

82

Component Description

➤

Convection motor

➤

Bake element

➤

Broil element

➤

Convection element

➤

Door Latch Assembly

➤

High temp cutout

➤

Door switch

➤

Air switch

83

Component Description

Convection Fan Assembly

Component Description

Convection Fan Assembly

➤

Cooling fan blade for

cooling the motor

➤

Cooling blade comes

with motor

➤

Convection fan blade

(turns CW)

➤

LH thread on nut

84

Component Description

Bake Element

Component Description

Bake Element

➤

Bake element is

rated at 2600W

(Part # 14-38-444)

85

Component Description

Broil Element

Component Description

Broil Element

➤

Rated at 3600 W

➤

Heats the oven to

840 degrees in

clean cycle

(part # 14-38-442)

86

Component Description

Convection Element

Component Description

Convection Element

➤

Rated at 2750 W

➤

Located on rear

wall of oven

(part # 14-38-445)

87

Component Description

Door Latch Assembly

Component Description

Door Latch Assembly

➤

Lock Switch

➤

Unlock Switch

➤

Normal use:

➤

Lock switch….open

➤

Unlock switch..closed

➤

During clean:

➤

Lock switch...closed

➤

Unlock switch…open

Latch switches & wiring

utilize 12VDC circuit

However Latch motor

runs on 120 VAC

(part # 14-38-095)

88

Component Description

High Temp Cutout

Component Description

High Temp Cutout

➤

Trips at 350 degrees

➤

Will trip if oven interior

exceeds 975 degrees

➤

Disables L1 to stalled fan

relay contacts

➤

HTC is serviceable

from the front of the oven

(part # 14-33-863)

89

Component Description

Door Switch

Component Description

Door Switch

➤

Serves three functions

➤

Door open signals board to

close K7…. turning on

lights

➤

In clean monitors the fact

that the door is closed &

signals board to power

latch motor

➤

When the door is opened, it shuts off the

convection fan by de-energizing the K4 relay

(part # 14-19-809)

90

Component Description

Air Switch

Component Description

Air Switch

➤

Mounted in air path of

cooling fan

➤

When closed, it allows for

the activation of the stalled

fan relay

➤

Cover must be on back of

oven for correct air flow

over switches

➤

Conveys 120 VAC

(part # 14-38-606)

91

Component Description

Oven Module

Component Description

Oven Module

➤

A replacement oven cell will include the

following items as a single unit:

➤

Bake element

➤

Broil element

➤

Halogen lights & cover

➤

Sensor

➤

Insulation

➤

Outer panels

(part # 35-00-661)

92

Lower Oven….any questions at this point?

Lower Oven

….any questions at this point?

➤

Convection motor

➤

Bake element

➤

Broil element

➤

Convection element

➤

Door Latch Assembly

➤

High temp cutout

➤

Door switch

➤

Air switch

S, SM, and SMW Oven error code messages

993

3

Error code

displayed

Possible cause Example Corrective Action

F1 Element supervisor enabled Bad relay board Replace main relay board.

F1, F7

alternating

Poor connection between display head and touch panel

Old membrane ribbon cable

Replace display head kit & main relay board (see note 1).

F2 Over temperature detected Intermittent sensor or

bad main relay board

Check sensor and connectors. If out of spec, replace sensor. If F2 still displays, replace main relay board (see note 2).

F3 Open oven sensor Open sensor or circuit

wiring

Check oven sensor from Molex plug on relay board – should read 1050 Ω at room temperature (see note 3).

F4 Shorted oven sensor or sensor

temperature below 40ºF

Shorted oven sensor wiring

Check oven sensor wiring – should read 1050 Ω at room temperature (see note 3).

F5 Element supervisor is disabled

(single or upper oven)

Intermittent sensor or bad relay board

Check oven sensor wiring (see note

3). If new sensor still displays F5, replace main relay board.

F7 Display head detected a stuck

key (on electronic touch pad)

Bad connection between display head and touch panel

Replace display head kit. If problem persists, replace touch panel (see notes 1 & 4).

S, SM, and SMW Oven error code messages

994

4

Error code

displayed

Possible cause Example Corrective Action

F8 Shorted meat probe (NOTE:

no meat probe is used on these models)

Bad relay board Replace main relay board.

F9 Invalid door switch status

(single or upper oven)

Bad or stuck latch switches

Check latch for proper operation. Replace if necessary.

FC Communication error detected

by display head

Lower oven relay board not powered up

Check cables and harnesses between main and lower relay boards. If they’re OK, replace lower oven relay board.

FF Bad analog/digital converter Intermittent sensor or

main relay board

Check sensor and replace if necessary. If new sensor displays

FF, replace main relay board.

Fr (1) Invalid door latch

switch status for lower oven

Check lower door latch switches

Replace latch if necessary.

(2) Communications error at display head

Check display head Replace display head (see note 1).

(3) Element supervisor disabled lower oven

Intermittent lower oven sensor or lower oven relay board

Check sensor and replace if necessary. If new sensor displays Fr, replace lower oven relay board.

S, SM, and SMW Oven error code messages

995

5

Note Description Additional notes

1F1 & F7 errors are caused by a loss of communication

between the display head and the touch panel. Heat migrates to affect the connector on the display head. The new relay board # 35-00-760 has been reprogrammed to keep the cooking fan on until internal oven temperature reaches 300ºF.

• Single oven display head # 35-00-703

• Double oven display head # 35-00-704

• Main relay board # 35-00-760

2, 3 Check sensor by taking resistance reading from Molex

plug on main relay board. A good sensor will read ~ 1050 Ω at room temperature (75ºF). Replace sensor if out of tolerance by ± 100 Ω or more. Make sure butt splices are in the air channel and not stuck in the insulation or against the oven liner.

When checking sensor, also check each lead to chassis ground and to each phase of power line. If grounded or if voltage is present, sensor may read a correct resistance as a loop, but still produce error codes. Check lead dress very carefully.

4 The touch panel is an electronic switching device, so it

doesn’t have actual keys to stick. It constantly checks touch pads for inputs. If its cable has a poor or intermittent connection, the microprocessor will electronically switch all keys on. This will produce an F7 error code that the display head will show as a stuck key.

The display head was designed for use with either membrane switches or electronic inputs.

96

Lower Oven….any questions at this

point?

Lower Oven….any questions at this

point?

Any questions or comments regarding

error codes?

97

HOW THE LOWER OVEN

WORKS

HOW THE LOWER OVEN

WORKS

➤

BAKE CYCLE

➤

BROIL CYCLE

➤

CONVECTION BAKE

➤

CONVECTION ROAST

➤

CLEAN CYCLE

98

N/C

999999

99

N/C

100

N/C