Cavity Thermostat; No Load Cavity Thermostat - KitchenAid KBMS1454R Technical Education

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

CAVITY THERMOSTAT

Refer to pages 4-5 for the procedure for ac-
cessing the cavity thermostat.
1. Unplug microwave oven or disconnect
power.
2. Disconnect one of the wires from the ther-
mostat terminals.
3. Set the ohmmeter to the R x 1 scale.
4. Touch the ohmmeter test leads to the
terminals. The meter should indicate a
closed circuit (0 Ω).
NOTE: The thermostat opens @ 239°F / 115°C
and closes at –31°F / –35°C. If the thermostat
is defective, the ohmmeter will indicate an
infinite circuit.
WARNING
Electrical Shock Hazard

NO LOAD CAVITY THERMOSTAT

NOTE: The no load cavity thermostat assem-
bly is a non-serviceable component. It is lo-
cated below the floor of the oven cavity. To
check the thermostat, perform the following
steps.
1. Unplug microwave oven or disconnect
power.
2. Disconnect the white wire from the high
voltage transformer terminal.
3. Set the ohmmeter to the R x 1 scale.
4. Touch one ohmmeter test lead to the white
wire connector from the high voltage trans-
former. Touch the other ohmmeter test
lead to the white wire of the magnetron
thermostat. The meter should indicate a
closed circuit (0 Ω).
NOTE: The thermostat opens @ 257°F / 125°C
and closes at 185°F / 85°C. If the thermostat is
defective, the ohmmeter will indicate an infinite
circuit.
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