Whirlpool MH2175XSB Service Guide - Page 47

Microwave Oven Power Output Test, Failure Codes Indications - 4 won t heat

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Microwave Oven Power Output Test 1. Place 8 oz (250 mL) of lukewarm water in the center of the microwave oven. 2. Operate on HIGH power level for 2 minutes. Water should be hot. NOTE: If the water takes longer than 2 minutes to heat, this may indicate either the operating voltage is lower than 110 volts or there is a problem with the microwave oven. Failure Codes Indications Display Flashing colon ":" F2 F3H F6 Likely Failure Condition Power failure Touch panel failure Humidity sensor failure Microwave relay failure Recommended Repair Procedure After a power failure, the colon ":" will be flashing. Press any key to end this indication. The colon will then be steady when in standby. 1. Unplug microwave oven or disconnect power. 2. Replace touch panel. 3. Plug in microwave oven or disconnect power. 4. If problem persists, unplug microwave oven or disconnect power. 5. Replace electronic control. 6. Plug in microwave oven or reconnect power. 1. Unplug microwave oven or disconnect power. 2. Connect a new sensor to the electronic control (at P1). 3. Plug in microwave oven or reconnect power. 4. If problem persists, unplug microwave oven or disconnect power. 5. Replace electronic control. 6. Plug in microwave oven or reconnect power. 1. Unplug microwave oven or disconnect power. 2. Check wiring to Relay 4903 for short circuits. 3. If wiring is OK, replace electronic control. 4. Plug in microwave oven or reconnect power. 6-3

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6-3
1.
Place 8 oz (250 mL) of lukewarm water in the center of the
microwave oven.
2.
Operate on HIGH power level for 2 minutes. Water
should be hot.
NOTE: If the water takes longer than 2 minutes to heat,
this may indicate either the operating voltage is lower
than 110 volts or there is a problem with the microwave
oven.
Display
Likely Failure Condition
Recommended Repair Procedure
Flashing
colon “:”
Power failure
After a power failure, the colon “:” will be flashing. Press any key to end this
indication. The colon will then be steady when in standby.
F2
Touch panel failure
1.
Unplug microwave oven or disconnect power.
2.
Replace touch panel.
3.
Plug in microwave oven or disconnect power.
4.
If problem persists, unplug microwave oven or disconnect power.
5.
Replace electronic control.
6.
Plug in microwave oven or reconnect power.
F3H
Humidity sensor failure
1.
Unplug microwave oven or disconnect power.
2.
Connect a new sensor to the electronic control (at P1).
3.
Plug in microwave oven or reconnect power.
4.
If problem persists, unplug microwave oven or disconnect power.
5.
Replace electronic control.
6.
Plug in microwave oven or reconnect power.
F6
Microwave relay failure
1.
Unplug microwave oven or disconnect power.
2.
Check wiring to Relay 4903 for short circuits.
3.
If wiring is OK, replace electronic control.
4.
Plug in microwave oven or reconnect power.
MICROWAVE OVEN POWER OUTPUT TEST
FAILURE CODES INDICATIONS