Whirlpool WED7990XG0 Troubleshooting Guide download pdf (Page 11)

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PAGE 11

6. Remove the bare copper wire terminal from

pin 5 of black drive motor switch. See figure 8.

7. Using figure 8, 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.

Resistance Contact Points

Winding Ω of Measurement

Lt. blue wire in back at

pin 4 and bare copper

MAIN 3.3–3.6 wire terminal removed

from pin 5 of black

drive motor switch

Lt. blue wire in back at

pin 4 and bare copper

START 2.7–3.0 wire terminal on

pin 3 of black drive

motor switch



If the resistance at the motor is correct, there

is an open circuit between the motor and machine

control electronics. Check for failed belt switch.



If the Start winding resistance is much

greater than 3 Ω, replace the motor.

8. Check the belt switch by measuring resistance

between the two light blue wires, as shown in

figure 9,while pushing up the belt switch pulley.



If the resistance reading goes from infinity

to a few ohms as pulley arm closes the switch,

belt switch is OK. If not, replace the belt switch.



If belt switch is OK and there is still an open

circuit,check and repair the wiring harness.

9. Door Switch problems can be uncovered by

following procedure under DIAGNOSTIC: Door

Switch, page 2; however,if this was not done,

the following can be done without applying power

to the dryer.Connect an ohmmeter across P8-3

(neutral, white wire) and P8-4 (door,tan wire).



With the door properly closed, the ohmmeter

should indicate a closed circuit (0–2 Ω).



If not, replace the door switch assembly.

TEST #4 Heater

This test is performed when either of the

following situations occur:

✔ Dryer does not heat

✔ Heat will not shut off

Dryer does not heat:

Locate the components using figure 10, page 12.

ELECTRIC DRYER:

1. Unplug dryer or disconnect power.

2. Access the thermal components.

3. Using an ohmmeter and referring to the wiring

diagram, measure the resistance from the red

wire terminal at the thermal cut-off to the red

wire terminal at the heater.



If the resistance is about 10 Ω,go to step 5.



If an open circuit is detected, go to step 4.

4. Visually check the wire connections to the

thermal cut-off, high limit thermostat,and heater.

If connections look good, check for continuity

across each of these components.

Figure 9. Checking the belt switch.

Lt. Blue

Wires

Belt Switch Pulley Belt Switch

Main Winding:

Lt. Blue Wire in Back

and Bare Copper Wire

Start

Winding:

Lt. Blue

Wire in

Back

and Bare

Copper

Wire

Figure 8. Main and start winding measure points.

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Whirlpool WED7990XG0 Troubleshooting Guide Page 11

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