Troubleshooting
Troubleshooting table
Symptom
Cause
Corrections
1
Oven is dead.
Fuse is ok.
No display and no operation
at all.
1. Open or loose wire harness
2. Open Thermal cutout.
3. Open low voltage transformer.
4. Defective DPC
Check the fan motor
when the cutout is
defective.
2
No display and no operation
at all.
Fuse is blown
1. Shorted harness.
2. Defective primary switch
3. Defective the short switch.
4. Defective Inverter Power supply
Check adjustments of
primary switch,
secondary switch, and
short switch
3
The Oven does not accept
key input (Program)
1. Defective DPC
2. Open or loose connection of the membrane keypad.
3. Shorted or open membrane keyboard.
4
The Oven lamp and the fan
motor turn on when oven is
plugged in with door closed.
1. Misadjusted secondary switch or loose wiring.
2. Defective secondary switch
Adjust door and latch
switches
5
Timer starts to countdown,
but there’s no microwave
oscillation. (No heat while the
oven lamp and the fan motor
are on)
1. Switches alignment is off
2. Open or loose connection of high voltage circuit,
especially the magnetron filament circuit.
3. Defective Inverter
4. Defective magnetron
5. Open or loose wiring of power relay B.
6. Defective primary switch.
7. Defective power relay B or DPC
Adjust door and latch
switches.
Check the Magnetron
and the Inverter.
31
