not heating

TROUBLESHOOTING
Do not continue with the diagnostics of appliance if the
household fuse is blown, a circuit breaker is tripped or if there
is less than 120-volt power supply at the wall outlet.
Complete the following steps before checking microwave
oven circuitry:
1. Unplug microwave oven or disconnect power.
2. Check for loose wiring or incorrect wiring within
microwave oven.
3. Disconnect white wire from power transformer and
discharge high-voltage capacitor.
4. All testing must be done with an ohmmeter having a
sensitivity of 20,000 ohms per volt DC or greater, and
powered by at least a 9-volt battery.
5. All operational checks using microwave energy must be
done with the microwave oven loaded with a minimum of
8 oz (250 mL) of water in a microwave-safe container
Primary, Secondary, and Monitor Interlock Switch Checkout Procedure
Switch Check By Door Open Door Closed
Primary
Interlock
1. Unplug microwave oven or disconnect power.
2. Disconnect the wires at the Primary Interlock Switch.
3. Check from the common terminal (brown wires) to the normally
open terminal (brown/white wires).
– +
1. Unplug microwave oven or disconnect power.
2. Disconnect the wires at the Primary Interlock Switch.
3. Check from the common terminal (brown wires) to the normally
closed terminal (orange wire).
+ –
Secondary
Interlock
1. Unplug microwave oven or disconnect power.
2. Disconnect the wires at the Secondary Interlock Switch.
3. Check from the common terminal (blue wire) to the normally open
terminal (white/blue wires).
– +
Monitor
Interlock
1. Unplug microwave oven or disconnect power.
2. Disconnect the wires at the Monitor Interlock Switch.
3. Check from the common terminal (blue wire) to the normally
closed terminal (white/red wires).