Troubleshooting guide

PAGE 13
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
9. Remove the bare copper wire terminal from
pin 5 of black drive motor switch. See figure 9.
10. Using figure 9 and the strip circuit on
page 21, check for the resistance values of
the motor’s Main and Start winding coils as
shown in the following table.
NOTE: Main and Start winding coils must be
checked at the motor.
If the resistance at the motor is correct,
there is an open circuit between the motor
and CCU. Go to step 11 to check for belt
switch problem.
If the Start winding resistance is much
greater than 3 ohms, replace the motor.
11. Check the belt switch by measuring
resistance between the two light blue wires,
as shown in figure 10, while pushing up the
belt switch pulley.
1
5
3
4
6
2
Main Winding:
Lt. Blue Wire in Back
and Bare Copper Wire
Start
Winding:
Lt. Blue Wire
in Back and
Bare Copper
Wire
Figure 9 - Main and start winding measure points.
Winding
Resistance
in ohms
Contact Points
of Measurement
MAIN3.3–3.6
Lt. blue wire in back at pin 4
and bare copper wire terminal
removed from pin 5 of black
drive motor switch
START2.7–3.0
Lt. blue wire in back at pin 4
and bare copper wire terminal
on pin 3 of black drive
motor switch
1
5
3
4
6
2
Figure 10 - Checking the belt switch.
Belt Switch Pulley
Belt Switch
Lt. Blue
Wires
If the resistance reading goes from open to a
few ohms as pulley arm closes the switch, belt
switch is good. If not, replace the belt switch.
If belt switch is good and there is still an open
circuit, check and repair the main wiring harness.
12. Reassemble all parts and panels.
13. Plug in dryer or reconnect power.
14. Perform steps under “Install Diagnostics”,
page 5, to verify repair.
TEST #4: Heat System
This test is performed when either of the
following situations occurs:
3Dryer does not heat
3Heat will not shut off
This test checks the components making up
the heating circuit. The following items are
part of this system:
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
�