Tech Sheet

15
FAILURE ERROR LIKELY FAILURE CONDITION
F4 Inputs E4 Microwave oven humiditysensor error
SUGGESTED CORRECTIVE ACTION PROCEDURE
NOTE: Before starting any test, cycle power to the oven (power off, wait 10
seconds, and 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 humidity sensor, such as a
Steam cycle. Wait 1minute, and then verify that the failure happens again.
1. Unplug oven or disconnect power.
2. Check that the P23 connection of the Microwave Appliance Manager is
rmly connected. If it is, go toStep 3. If it is not, reconnect and go to
Step 5.
3. Disconnect connector P23 from Microwave Appliance Manager and
measure the resistance ofthe sensor:
Between pins 3 and 1. It should be approximately 2800 Ω at 77°F ± 10°F
(25°C ± 10°C).
Between pins 3 and 2. It should be approximately 2800 Ω at 77°F ± 10°F
(25°C ± 10°C).
4. Check sensor for short to ground. If checks on sensor are not correct,
replace the sensor. If sensor checks are correct, replace the Microwave
Appliance Manager.
5. Reassemble all parts and panels before operating.
6. Plug in oven or reconnect power.
7. Verify operation is normal. Enter the Diagnostics menu, select “Error
Diagnostics,” and clear the history.
FAILURE ERROR LIKELY FAILURE CONDITION
F4 E8 Inverter over temperature
SUGGESTED CORRECTIVE ACTION PROCEDURE
NOTE: Before starting any test, cycle power to the oven (power off, wait 10
seconds, and 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, and then verify that the
failure happens again.
1. Unplug 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
3. Reassemble all parts and panels before operating.
4. Plug in 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 oven or disconnect power, replace the fan, and
go to Step 8. Otherwise, go to Step 6.
6. Unplug oven or disconnect power.
7. Replace the inverter board.
8. Reassemble all parts and panels before operating.
9. Plug in oven or reconnect power.
10. Verify operation is normal. Enter the Diagnostics menu, select “Error
Diagnostics,” and clear the history.
Microwave
Appliance
Manager
Humidity
Sensor
1600
P23