Error/Failure Codes Indications - Whirlpool WML55011HW Service Manual

DIAGNOSTICS (Cont.)
NOTE: Many of the problems listed in the chart below may be solved by power cycling. Unplug microwave oven or disconnect power.
After 1 minute, plug in microwave oven or reconnect power.
Display Likely Failure
Condition
"Enter clock" or Power failure
Flashing colon ":"
F2E1 Touch panel
failure
F1E4 MW Relay
F4E4 Humidity
sensor error
F8E5 Exhaust air
temperature
detection
failure
2-4 n Low Profile Microwave Hood Combination
For Service Technician Use Only

Error/Failure Codes Indications

Recommended Repair Procedure
After a power failure, "Enter clock"/Colon ":" will be flashing. Press any key/CANCEL to end this
indication. The colon (:) will appear when in Standby mode.
1. Unplug microwave oven or disconnect power.
2. Replace touch panel.
3. Replace all parts and panels before operating.
4. Plug in microwave oven or reconnect power.
5. If problem persists, refer to "ACU Pin Voltage Matrix."
1. Unplug microwave oven or disconnect power.
2. Check wiring to Relay 4903.
3. Check to see if relay (4903 on ACU) contact has welded closed.
4. Replace all parts and panels before operating.
5. Plug in microwave oven or reconnect power.
6. If problem persists, refer to "ACU Pin Volatage Matrix" to check P2-2 (Door), P1-3 (N), and
P1-1(L).
1. Enter the Diagnostics mode (press CANCEL - CANCEL - START), and then press COOK to
display the humidity sensor reading. If display does not show the value between "2000 and
9000" continue to Step 2.
2. Unplug microwave oven or disconnect power.
3. Connect a new humidity sensor ACU to cable.
4. Replace all parts and panels before operating.
5. Plug in microwave oven or reconnect power.
6. Enter the Diagnostics mode (press CANCEL - CANCEL - START), then press COOK to see if
failure code reappears.
NOTE: There may be a delay (approximately 1 minute, 20 seconds) before the F4E4 failure
code is displayed.
7. If the F4E4 failure code reappears, unplug microwave oven or disconnect power.
8. Replace ACU.
9. Replace all parts and panels before operating.
10. Plug in microwave oven or reconnect power.
1. Enter the Diagnostics mode (press CANCEL - CANCEL - START), and then press SETUP or
CLOCK to display the exhaust air temperature sensor reading. Verify the sensor temperature
reading is at room temperature (typically 50°F to 90°F [10°C to 32°C]) and verify failure
code. If failure code matches complaint, continue to Step 2.
2. Unplug microwave oven or disconnect power.
3. Disconnect sensor from ACU.
4. Measure sensor resistance between connector pins and confirm reading is between 9.5 kΩ
and 10.5 kΩ at room temperature. If measurement is not correct or if a short or open circuit
is found, replace sensor.
5. Replace all parts and panels before operating.
6. Plug in microwave oven or reconnect power.
7. Enter the Diagnostics mode (press CANCEL - CANCEL - START), and then press SETUP or
CLOCK to display the cavity temperature sensor reading. Verify the sensor temperature
reading. If it is still not correct, replace ACU.
8. If failure does not reappear, stop.