Humidity Sensor; Cavity Thermostats 1, 2, & 3 - Whirlpool MH9180XL Service Manual

Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

HUMIDITY SENSOR

Refer to page 4-4 for the procedure for servic-
ing the humidity sensor.
1. Unplug the microwave oven or disconnect
the power.
2. Disconnect the 3-wire connector from the
control board.
3. Set the ohmmeter to the R x 1K scale.
4. Touch the meter leads to the indicated
wire terminals of the 3-wire connector.
The meter should indicate as follows:
Black to white = approximately 2800 Ω
@ 77˚F/25˚C.
White to red = approximately 2800 Ω
@ 77˚F/25˚C.
WARNING
Electrical Shock Hazard
CAVITY THERMOSTATS 1, 2, & 3
Refer to pages 4-4 and 4-8 for the procedures
for servicing the cavity thermostats.
1. Unplug the microwave oven or disconnect
the power.
2. Disconnect the wires from the terminals.
3. Set the ohmmeter to the R x 1 scale.
4. Touch the ohmmeter leads to the termi-
nals. The meter should indicate a closed
circuit (0 Ω).
NOTE: Thermostat 1 opens @ 329°F / 165°C.
Thermostats 2 and 3 open @ 257°F / 125°C. If
the thermostat is defective, the ohmmeter will
indicate an infinite circuit.
5-4