Troubleshooting Procedures
!
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect power to microwave oven and discharge the
high-voltage capacitor before servicing, unless testing requires power.
© 2006 Maytag Services 16027303 11
Symptom Cause Correction
Microwave oven fan motor
engages when power cord is
plugged in.
1. Door sensing switch loose connector.
2. Door sensing switch loose wires.
Check connector and wiring of
door sensing switch.
Microwave oven does not operate,
oven not in standby mode when
power cord is plugged in.
1. Check input voltage.
2. Defective PCB assembly.
Make sure house outlet works.
Replace PCB assembly.
Microwave oven emitting a loud,
buzzing noise.
1. Fan and/or fan motor loose.
2. High voltage transformer loose.
3. High voltage diode shorted.
Check fan and/or fan motor.
Check high voltage transformer.
Replace high voltage diode.
Microwave oven turntable motor
does not rotate.
1. Turntable motor wiring loose/open.
2. Defective turntable motor.
Check wiring of turntable motor.
Replace turntable motor.
Microwave oven stops during
cooking operation.
1. Open or loose wiring of primary
interlock switch.
2. Open thermal (magnetron) cutout.
Adjust door and latch switches.
Allow microwave oven to cool to
determine if magnetron TCO is
defective. Replace if necessary.
Microwave oven emits sparks
when cooking.
1. Metallic ware or cooking dishes
touching on the oven wall.
2. Ceramic ware trimmed with gold or
silver powder.
Do not use cookware with
metallic trimming or gold/silver
powder.
Microwave oven cooks unevenly. 1. Uneven intensity of microwave due
to microwave characteristics.
2. Microwave cavity dirty.
Cover food with plastic wrap or
cover food with a lid.
Clean microwave cavity.
Microwave oven turntable emits
noise when operating.
1. Turntable motor loose.
2. Turntable motor defective.
Tighten screws securing motor.
Replace turntable motor.
Checkout Procedure: Fuse
PROBLEM CAUSE
Fuse blows immediately after door is closed.
Fuse blows immediately after door is opened.
Improper operation of the primary interlock and secondary
interlock switches and/or interlock monitor switch.
Fuse blows when door is closed and START
key is touched.
Malfunction of high voltage transformer; high voltage capacitor
including diode, magnetron, blower motor or circuit board.
NOTES: Replace blown fuse with 20 Amp fuse.
If the fuse is blown due to an improper switch operation, replace all interlock switches, PCB Ass’y and the
fuse simultaneously, and ensure they are connected properly.
Check for microwave energy leakage after replacing interlock and monitor switches.
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