TRAINING MANUAL WM3001H*A
WM3001H*A Page 89 Washer
WASH HEATER
The wash heater is at the bottom of the
tub where it heats the water in the sump.
Check the voltage to the wash heater by
putting your voltmeter on the heater
terminals and measuring the voltage, which
should be approximately 120 V
AC
when
operating. This voltage can also be
measured at the heater’s connector on the
main board. There is a point in TEST
MODE that activates the dryer heater for
1.5 seconds, so have the meter connected
before pressing the test button.
With the heater disconnected from the
circuit, it should read 15 ± 20%.
To remove the heater, first drain the sump.
Disconnect the electric terminals. Remove
the outer nut that holds the ground wire to
the center post. Unscrew the second nut
on the ground post all the way to the end
but do not remove it. This will remove the
tension on the gasket and allow the heater
to be pulled out.
If a foreign object becomes caught
between the drum and tub, it can often be
fished out through the heater opening with
a wire after removing the heater.
The wash heater thermistor can be tested
at its connector or at the connector on the
main board. Its rubber gasket is a pressure
fit in the hole next to the heater. See the
section on thermistors on pages 94.
The round object on the right is the ECO.
It is the sensor that determines water
hardness and detergent concentration to
work with the LOAD SIZE feature to
suggest appropriate amounts of detergent.
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