Whirlpool MGDX700XW Troubleshooting Guide download pdf (Page 6)

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4. Check the belt switch and drive motor.

Access the belt switch and drive motor

by removing the back panel. See

Removing the Back Panel, page 11.

Slowly remove the drum belt from the

spring-loaded belt switch pulley, gently

letting the belt switch pulley down. See

figure 7.

5. Remove the white connector from the

drive motor switch. See figure 8.

6. Remove the bare copper wire terminal

from pin 5 of black drive motor switch.

See figure 9.

7. Using figure 9, 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.

Winding Resistance

Contact Points

of Measurement

MAIN

3.3–3.6 Ω

Lt. blue wire in back at

pin 4 and bare copper wire

terminal removed from pin 5

of black drive motor switch

START

2.7–3.0 Ω

Lt. blue wire in back at

pin 4 and bare copper 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 10, 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 Test: 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 #3 Heater

This test is performed when either of the

following situations occur:

✔

Dryer does not heat

✔

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 burner assembly

no ✔

Centrifugal switch

✔ ✔

Exhaust thermistor

✔ ✔

Machine control electronics.

See ESD information, page 1.

✔ ✔

User interface and

housing assembly

✔ ✔

Gas supply

no ✔

Dryer does not heat:

Locate the components using figure 11,

page 7.

ELECTRIC DRYER:

1. Unplug dryer or disconnect power.

2. Remove the toe panel to access the

thermal components. See Removing

the Toe Panel, page 10.

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.

➔

Replace the heater if it is electrically

open.

➔

Replace both the thermal cut-off and

high limit thermostat if either one is

electrically open.

5. If no open circuit is detected, 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 17, page 10 for

connector location; and Accessing &

Drum

Belt

Belt Switch Pulley

Figure 7. Slowly remove drum belt.

White

Connector

Drive Motor

Switch

Figure 8. Remove white connector.

Main Winding:

Lt.

and Bare Copper Wire

Blue Wire in Back

Start

Winding:

Lt.

and

Bare Copper

Wire

Blue Wire

in Back

Figure 9. Main and Start winding

measure points.

Lt. Blue

Wires

Belt Switch

Pulley

Figure 10. Checking the belt switch.

1 2 3 4 5 6 7 8 9 10 11 12

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Whirlpool MGDX700XW Troubleshooting Guide Page 6

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