PAGE 14
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
This test checks the components making up
the heating circuit. The following items are
part of this system:
NOTE: On the gas dryer, the inlet thermistor
is located below the CCU bracket at the drum
inlet vent. Refer to strip circuit on page 22 to
diagnose heater system.
Dryer does not heat:
Locate the components using figures 20a and
20b. To access heater system components, see
Dryer Disassembly Instructions, page 23.
ELECTRIC DRYER ONLY:
3
Quick Check: Perform the “CCU Line
Voltage 1” check under Component
Activation. If L1 is present, the thermal
cutoff is functional.
3
Quick Check: Perform the “CCU Line
Voltage 2” check under Component
Activation. If L2 is present, the centrifugal
switch, high limit thermostat, and the side
of the heater connected to heater relay 1
are functional.
1. Unplug dryer or disconnect power.
2. Remove top panel to access the machine
electronics.
3. Check Heaters—on the CCU, use an
ohmmeter to measure the resistance between
the violet wire terminal on heater relay #1
and the violet wire terminal on heater relay #2.
If the resistance is
≤
50
Ω
, go to step 5.
If an open circuit is detected, go to step 4.
Figure 20b - Thermal components,
gas dryer, viewed from front.
Outlet
Thermistor
Thermal Fuse
Gas Dryer
Thermal
Cut-Off
High Limit Thermostat
Flame
Sensor
Figure 20a - Thermal components,
electric dryer, viewed from front.
Inlet Thermistor/High Limit
Thermostat Assembly
Heater
Element
Electric Dryer
Thermal Fuse
Outlet
Thermistor
Thermal
Cut-Off
Part of Heating System
Electric
Dryer
Gas
Dryer
Harness/connection
Heater relay
Thermal cut-off
Thermal fuse
no
High limit thermostat
Heat element assembly
no
Gas valve assembly
no
Centrifugal switch
Outlet thermistor
Inlet thermistor
Machine control electronics
Console electronics and housing
assembly
Gas supply
no