Maytag MEDB750YW0 Troubleshooting Guide download pdf (Page 20)

PAGE 20

FOR SERVICE TECHNICIAN’S USE ONLY

DO NOT REMOVE OR DESTROY

TEST #7: Door Switch

Activate the Service Diagnostic Mode and then

select the User Interface/Control System Test.

See procedures on page 4. Perform the steps

under “Diagnostic: Door Switch/Drum Light.”

Functionality is veriﬁed when opening the door

causes “p:7e” (electric) or “p:79” (gas) to be

displayed and turns on the drum light. Closing

the door should turn off the drum light.

If the preceding conditions are not met:

1. Unplug dryer or disconnect power.

2. Remove console to access the CCU

and User Interface (UI).

3. Check that the wires between the door

switch and CCU are connected. (Refer to

wiring diagrams on pages 24–25.)

If the connections are good, replace the

wire and door switch assembly and retest.

If wire and door switch assembly have

been replaced and dryer still does not start,

replace the CCU.

4. Reassemble all parts and panels.

5. Plug in dryer or reconnect power.

6. Perform the steps under “Diagnostic:

Door Switch/Drum Light” to verify repair.

TEST #8: Drum Light

This test is performed if the drum light

does not turn on.

1. Pressing the “drum light” button on the

console should toggle the button indicator on

and off (and the drum light on and off).

If the button indicator toggles on and off,

go to step 2.

If the button indicator does not turn on, go

to TEST #6 – “Some buttons do not light

indicators,” page 19.

2. Unplug dryer or disconnect power.

3. Remove the rear panel to access

the drum light.

4. Check Drum Light—using an ohmmeter,

measure resistance across the drum light

terminals.

If an open circuit is detected, replace

the drum lamp and retest.

If the reading is around 100–150 Ω,

continue to step 5.

5. Remove console to access the CCU

and User Interface (UI).

6. Check Drum Light Harness—using an

ohmmeter, measure the resistance between

“L1” on the terminal block (or AC plug) and

CCU P8-1 (brown wire).

If the reading is around 100–150 Ω, the

drum light and harness are OK. Continue

to step 7.

If an open circuit is detected, check harness

connections between the terminal block,

the drum light, and the CCU. If connections

are OK, replace the main harness.

7. Plug in dryer or reconnect power. Press

the “drum light” button to activate the drum

light. With voltmeter set to AC, connect leads

across the drum light terminals.

If 120V AC is present, and lamp does

not light, replace drum light and retest.

If 120V AC is not present, replace the CCU.

8. Unplug dryer or disconnect power.

9. Reassemble all parts and panels.

10. Perform steps under “Install Diagnostics”,

page 5, to verify repair.

TEST #9: Water Valve (Steam Model)

Activate the Service Diagnostic Mode and

then select the User Interface/Control System

Test (see page 4). Perform the diagnostic test

“Console ID, Motor, Heater, and Water Valve.”

Verify that water is being sprayed into the drum.

See Figure 15, page 21.

NOTE: The motor and heater are also activated

during this test.

NOTE: Refer to Strip Circuit on page 22

to diagnose water valve.

If no water is sprayed in the drum:

1. Verify that water is hooked up and turned on.

2. Unplug dryer or disconnect power.

3. Remove console to access the CCU

and User Interface (UI).

4. Verify that the wires are connected to the

water valve relay on the CCU. Refer to CCU

diagram on page 9.

5. Check Water Valve & Harness—using an

ohmmeter, measure the resistance between

the water valve relay COM connector (red wire)

and CCU P8-5 (black/white wire).

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Maytag MEDB750YW0 Troubleshooting Guide Page 20

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