Maytag MHWC7500YW0 Manual

FOR SERVICE TECHNICIAN ONLY - DO NOT REMOVE OR DESTROY
IMPORTANT
Electrostatic Discharge (ESD)
Sensitive Electronics
ESD problems are present everywhere. ESD may damage
or weaken the electronic control assembly. The new control
assembly may appear to work well after repair is finished,
but failure may occur at a later date due to ESD stress.
Use an anti-static wrist strap. Connect wrist strap to green
I
ground connection point or unpainted metal in the appliance.
Touch your finger repeatedly to a green ground connection point
or unpainted metal in the appliance.
Before removing the part from its package, touch the anti-
I
static bag to a green ground connection point or unpainted
metal in the appliance.
Avoid touching electronic parts or terminal contacts; handle
I
electronic control assembly by edges only.
When repackaging failed electronic control assembly in anti-
I
static bag, observe above instructions.
Troubleshooting Guide
NOTE: After problem(s) are fixed, please run the diagnostic test to ensure that there are no other issues.
PROBLEM
WON'T POWER UP
(buttons do not respond
when pressed)
WON'T START CYCLE
PART NO. W10468733A
-OR-
POSSIBLE CAUSE/TEST
NOTE: Possible Cause/Tests must be performed in the sequence shown for each problem.
1. Check that the washer is plugged into a working outlet and for blown fuses.
2. Check for power going to Central Control Unit (CCU) by listening for a click in the CCU
when the washer is plugged in. If no click, replace the CCU.
3. Unplug washer or disconnect power.
4. Check continuity of line cord and line filter.
5. Check harness connections to the CCU.
6. Plug in washer or reconnect power.
7. Check the button/LED assembly by selecting different cycles and changing the modifiers
and options available to confirm that the button/LED assembly is responding.
8. Check the connection of the power cord to the line filter and at the CCU. Check to confirm
that the door closes fully.
1. Open and close the door. The door must be opened between consecutive wash cycles.
2. Check the door switch/lock unit using the diagnostics. See Quick Diagnostic Test.
3. If door is locked, drain the washer.
4. Unplug washer or disconnect power.
5. Check the wire harness connections.
6. Plug in washer or reconnect power.
7. Check the button/LED assembly by selecting different cycles and changing the modifiers
and options available to confirm that the button/LED assembly is responding.

DIAGNOSTIC GUIDE

Before servicing, check the following:
• Make sure there is power at the wall outlet.
• Has a household fuse blown or circuit breaker tripped? Time
delay fuse?
• Are both hot and cold water faucets open and water supply
hoses unobstructed?
• All tests/checks should be made with a VOM or DVM having
a sensitivity of 20,000 ohms per volt DC or greater.
• Check all connections before replacing components. Look for
broken or loose wires, failed terminals, or wires not pressed into
connections far enough.
• A potential cause of a control not functioning is corrosion on
connections. Observe connections and check for continuity
with an ohmmeter.
• Connectors: Look at top of connector. Check for broken or loose
wires. Check for wires not pressed into connector far enough to
engage metal barbs.
• Resistance checks must be made with power cord unplugged
from outlet, and with wiring harness or connectors disconnected.
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