Service Guide
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 starng any test, cycle power to the oven (power o, wait 10 seconds, and then
power on). Aer 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 funcon. Wait 1 minute,
then verify that the failure happens again.
1. Unplug the oven or disconnect power.
2. Check the following:
a. Cooling fan connecon for any loose connectors.
b. Oven installaon and make sure there is no air blockage at the boom vent.
3. Reassemble all parts and panels before operang.
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 funcon 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 operang.
9. Plug in the oven or reconnect power.
10. Verify operaon is normal. Enter the Diagnoscs Menu, select “Error Diagnoscs”, and clear
the history.