Whirlpool WOC54EC0H Service Manual page 29

Code Description
F4E1 Microwave Cavity
Temperature Sensor
Error
F4E2 Magnetron
Temperature Sensor
Error
For Service Technician Use Only
Explanation and Recommended Procedure
NOTE: Before starting any test, cycle power to the oven (power off, wait 10 seconds, then power
on). After powering on, be sure that a load, such as a microwave-safe cup of water, is present in
the microwave oven cavity, and start a microwave cooking function that uses the temperature
sensor, such as a Convect cycle. Wait 1 minute, then verify that the failure happens again.
1. Unplug the oven or disconnect power.
2. Check that the P22 connection of the Microwave ACU is firmly connected. If it is, go to Step
3. If it is not, reconnect and go to Step 5.
3. Disconnect connector P22 from the Microwave ACU, and measure the resistance of the
thermistor. It should be approximately 230 kΩ at 77°F ± 10°F (25°C ± 10°C).
4. Check thermistor for short to ground. If check on thermistor is not correct, replace the
thermistor. If thermistor check is correct, replace the Microwave ACU.
5. Reassemble all parts and panels before operating.
6. Plug in the oven or reconnect power.
7. Verify operation is normal. Enter the Diagnostics Menu, select "Error Diagnostics", and clear
the history.
NOTE: Before starting any test, cycle power to the oven (power off, wait 10 seconds, and then
power on). After powering on, be sure that a load, such as a microwave-safe cup of water, is
present in the microwave oven cavity, and start a microwave cooking function. Wait 1 minute,
then verify that the failure happens again.
1. Unplug the oven or disconnect power.
2. Check that the P21 connection of the Microwave ACU is firmly connected. If it is, go to Step
3. If it is not, reconnect and go to Step 5.
3. Disconnect connector P21 from the Microwave ACU. Measure the resistance of the
thermistor. It should be (approximately) 10 kΩ at 77°F ± 10°F (25°C ± 10°C).
4. Check thermistor for short to ground. If check on thermistor is not correct, replace the
thermistor. If thermistor check is correct, replace the Microwave ACU.
5. Reassemble all parts and panels before operating.
6. Plug in the oven or reconnect power.
7. Verify operation is normal. Enter the Diagnostics Menu, select "Error Diagnostics", and clear
the history.
DIAGNOSTICS & TROUBLESHOOTING
Microwave
ACU
Cavity
Thermistor
P22
Microwave
ACU
Magnetron
Thermistor
P21
Whirlpool Smart Wall Ovens n
®
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