Tech Sheet

FOR SERVICE TECHNICIAN’S USE ONLY
10
FAILURE ERROR LIKELY FAILURE CONDITION
F1 E4 Microwave oven relay4903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. Wait 1minute, and then verify that the
failure happens again.
1. Make sure that all interlock switches work properly: when door is open,
microwave light is on; when dooris closed, microwave light is off.
2. Unplug oven or disconnect power.
3. Check the following on the Microwave ApplianceManager:
a. Wire connections to Relay 4903
b. Check if Relay 4903 is shorted. If so then gotoStep 7.
4. Reassemble all parts and panels before operating.
5. Plug in oven or reconnect power.
6. To check if the error code is still present, 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. Wait 1minute to
check if the error appears. If error remains, go to Step 7. If not, go to Step
10.
7. Unplug oven or disconnect power and replace the Microwave Appliance
Manager.
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.
FAILURE ERROR LIKELY FAILURE CONDITION
F1 E5 Microwave oven inverter 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. Wait 1minute, and then verify that the
failure happens again.
1. Make sure that all interlock switches work properly: when door is open,
microwave light is on; when dooris closed, microwave light is off.
2. Unplug oven or disconnect power.
3. Check the following on the Microwave ApplianceManager:
a. Relay 4903
b. Connector P8
4. Check the following connections on the Inverterboard:
a. CN701
b. CN702
c. CN703
5. If the door works properly and all connections areokay, replace the
Microwave Inverter Board.
6. Reassemble all parts and panels before operating.
7. Plug in oven or reconnect power.
Line Fuse
20A
Primary
Interlock
Switch
Inverter
Microwave Relay
4903
1
4
BR
BU
CN702
L1
Magnetron
MW Inverter
PWM
To
MW
Relay
4903
P8
P354
WH
BU
1
2
3
CN701
E701
CN703
CN702
RD RD
YL/
GN
3
2
1
P355