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TECH SHEET - DO NOT DISCARD

If there is an open circuit, replace the

high limit thermostat and thermal

cut-off.

Otherwise, go to step 6.

6. Perform TEST #4d. If this is OK, re-

place the machine control electronics.

Heat will not shut off:

1. Unplug dryer or disconnect power.

2. Access the machine control

electronics, remove the P14 connector,

then measure the resistance between

P14-3 (red-white wire) and P14-6

(red-white wire) at the connector. See

figure 16, page 11 for connector

location; and Accessing & Removing

the Electronic Assemblies, page 11.

If 5–15 k ohms are measured,

replace the machine control

electronics.

If the resistance is greater than

20 k ohms, replace the exhaust

thermistor.

Heat will not shut off:

1. Unplug dryer or disconnect power.

2. Access the machine control

electronics, remove the P4 connector,

then measure the resistance between

P4-3 (red wire) and P4-6 (red wire) at

the connector. See figure 16, page 11

for connector location; and Accessing

& Removing the Electronic Assemblies,

page 11.

If 5–15 k ohms are measured,

replace the machine control

electronics.

If the resistance is greater than

20 k ohms, replace the exhaust

thermistor.

TEST #4a Exhaust Thermistor

The machine control electronics monitors

the exhaust temperature using the exhaust

thermistor, and cycles the heater relay on

and off to maintain the desired

temperature.

Begin with an empty dryer and a clean lint

screen.

1. Plug in dryer or reconnect power.

2. Start the Timed Dry cycle.

F-22

3. If after 60 seconds,

flashes in the display and the dryer

shuts off, the thermistor or wire harness

is either open or shorted.

Unplug dryer or disconnect power.

Check wire connections at the

machine control electronics and

thermistor. See Accessing &

Removing the Electronic Assemblies,

page 11; and for thermistor location,

figure 10, page 7.

FOR SERVICE TECHNICIAN'S USE ONLY

If wire connections are OK, check

the exhaust thermistor resistance per

step 5.

F-22

4. If

display, the connections to the

thermistor are good. Therefore, check

the exhaust temperature value at any or

all of the temperature levels in

question, using the Timed Dry cycle,

and the following process:

Hold a glass bulb thermometer capable

of reading from 90° to 180°F (32° to

82°C) in the center of the exhaust outlet.

The correct exhaust temperatures are

as follows:

TEMPERATURE

SETTING

High

Medium

Low

Extra Low

The measured overshoot using the glass

bulb thermometer in the exhaust outlet

can be 30°F (17°C) higher.

5. If the exhaust temperature is not within

specified limits, or you have come here

from step 3, remove the P14 connector,

then measure the resistance between

P14-3 (red-white wire) and P14-6

(red-white wire) at the connector. See

figure 16, page 11 for connector

location; and Accessing & Removing

the Electronic Assemblies, page 11.

If the resistance is OK, check P14-3

and P14-6 to machine ground.

If resistance is greater than 0 (zero),

replace wiring harness.

NOTE: All thermistor resistance

measurements must be made while

dryer is disconnected from power.

The following table gives temperatures

and ranges for the associated

thermistor resistance values.

EXHAUST THERMISTOR RESISTANCE

TEMP.

°F (°C)

50° (10°)

60° (16°)

F-23

70° (21°)

If the thermistor resistance does not

agree with table, replace the exhaust

thermistor.

If the thermistor resistance checks

agree with the measurements in the

table, replace the machine control

electronics.

F-23

does not flash in the

EXHAUST TEMPERATURES

HEAT TURNS OFF*

HEAT TURNS ON

°F (°C)

155°±5° (68°±3°)

10°–15° (6°–8°)

140°±5° (60°±3°)

below the

heat turn off

125°±5° (52°±3°)

temperature

105°±5° (41°±3°)

RES.

TEMP.

RES.

k Ω

°F (°C)

19.0–22.0

80° (27°)

8.5–10.5

14.8–16.8

90° (32°)

6.8–8.8

11.5–13.5 100° (38°)

5.0–7.0

TEST #4b Thermal Fuse

The thermal fuse is wired in series with the

dryer drive motor.

1. Unplug dryer or disconnect power.

2. Access the thermal fuse by first

removing the back panel. See

Removing the Back Panel, page 11;

and for thermal fuse location see

figure 10, page 7.

3. Using an ohmmeter, check the

continuity across the thermal fuse.

If the ohmmeter indicates an open

circuit, replace the failed thermal

fuse.

TEST #4c Thermal Cut-Off

If the dryer does not produce heat, check

the status of the thermal cut-off.

1. Unplug dryer or disconnect power.

2. Access the thermal cut-off by first

removing the back panel. See

Removing the Back Panel, page 11.

3. Using an ohmmeter, check the

continuity across the thermal cut-off.

See figure 10, page 7, for location.

If the ohmmeter indicates an open

circuit, replace the failed thermal

cut-off and high limit thermostat. In

addition, check for blocked or

improper exhaust system.

TEST #4d Gas Valve

1. Unplug dryer or disconnect power.

2. Access the gas valve by removing the

front panel and drum assembly. See

Removing the Front Panel/Drum

Assembly, page 10.

3. Use an ohmmeter to determine if a

gas valve coil has failed. Remove

harness plugs. Measure resistance

across terminals. Readings should

match those shown in the following

chart. If not, replace coil.

Terminals Resistance

1365 ± 25

1 to 2

560 ± 25

1 to 3

1220 ± 50

4 to 5

IMPORTANT:

Be sure all harness

wires are looped back

through the strain

relief after checking or replacing coils.

PART NO. W10054160

PAGE 8

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