Whirlpool WOC75EC7H, Service Manual

Page: 31 / 84

For Service Technician Use Only
DIAGNOSTICS & TROUBLESHOOTING
Whirlpool
®
Smart Wall Ovens
n
2-13
Code Description Explanation and Recommended Procedure
F4E9 Inverter and
Magnetron Over
Temperature
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 the following:
a. Cooling fan connection for any loose connectors.
b. Oven installation and make sure there is no air blockage at the bottom vent.
3.
Reassemble all parts and panels before operating.
4. Plug in microwave oven or reconnect power.
5.
To check if the cooling fan is stalled, be sure that a load, such as a microwave-safe cup of
water, is present in the microwave oven cavity, and start a cooking function in the microwave
oven. Make sure the fan is running. If it is not, unplug the oven or disconnect power, replace
the fan and go to Step 8. If it is, go to Step 6.
6. Unplug microwave oven or disconnect power.
7.
Replace the Magnetron and the inverter board.
8. Reassemble all parts and panels before operating.
9.
Plug in the oven or reconnect power.
10. Verify operation is normal. Enter the Diagnostics Menu, select “Error Diagnostics”, and clear
the history.