Diagnostics & Troubleshooting; Diagnostics - Whirlpool LHW0050PQ Service Manual

DIAGNOSTICS & TROUBLESHOOTING
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
IMPORTANT
Electrostatic Discharge (ESD)
Sensitive Electronics
ESD problems are present everywhere. ESD
may damage or weaken the electronic con-
trol board. 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 antistatic wrist strap. Connect wrist
strap to green ground connection point or
unpainted metal in the appliance.
-OR-
Touch your finger repeatedly to a green
ground connection point or unpainted metal
in the appliance.
• Before removing the part from its pack-
age, touch the antistatic bag to a green
ground connection point or unpainted metal
in the appliance.
• Avoid touching electronic parts or terminal
contacts; handle electronic control board
by edges only.
• When repackaging failed electronic con-
trol board in antistatic bag, observe above
instructions.

DIAGNOSTICS

Before servicing, perform the following
checks:
• The power cord is firmly plugged into a live
circuit with proper voltage. Check the house-
hold fuses and circuit breakers.
• The washer is not in a Pause mode?
• Both hot and cold water faucets are open,
and the water supply hoses and water inlet
screens are unobstructed.
• All tests and 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 com-
ponents. Check for broken or loose wires,
failed terminals, or wires not completely
pressed into the connectors.
• All resistance checks must be made with the
power cord unplugged from outlet, and with
the wiring harness or connectors discon-
nected.
• The most common cause for control failure is
corrosion on connectors. Therefore, discon-
necting and reconnecting wires will be nec-
essary throughout test procedures.
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