Troubleshooting Procedures
©2004 Maytag Services 16023056 Rev. 0 17
Oven Error Code Display
Touchpad Display Error Mode
F1
Thermistor Open
F2
Thermistor Short Before Cooking
F3
Thermistor Short After Cooking
F4
Sensor Open
F5
Damper Switch Sensing Error
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.
Latch Board
Primary Interlock Switch
Monitor Interlock Switch
Secondary Interlock Switch
Models AMV4204A**, M 5
M 5165 5206 M 7 ,
JMV8208A**
MV420 A**,
MV A**, AMV A**, MV520 A**
Latch Board
Secondary Interlock Switch
Monitor Interlock Switch
Primary Interlock Switch
Models MV **,
5AMV1162A**, AMV 164A**
U 1152B MMV1153A**,
Checkout Procedure: Circuit Board
PROBLEM CAUSE
The START function fails to operate, but the high voltage
systems, interlock/monitor switches and door sensing/relays
all test good.
Proper temperature is not obtained.
Buzzer does not sound or sounds continuously.
Some segments of 1 or more digits display on the touch
panel, or display when they should not.
Defective Control Printed Circuit Board Assembly
NOTE: Check for microwave energy leakage after replacing Printed Circuit Board Assembly.
