KitchenAid Whirlpool W11400254 Service Manual page 25

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Display Likely Failure
Condition
F4E1 Cavity
temperature
sensor failure
F4E4
Humidity
sensor failure
F4E9
Popcorn
error/Smart
pop sound
failure
For Service Technician Use Only
Recommended Repair Procedure
1. Enter the Diagnostics mode (press CANCEL -CANCEL - START), and then press CONVECT to
display the cavity 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 PCBA.
4. Measure sensor resistance between connector pins and confirm reading is between
9.7 kΩ and 10.3 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 CONVECT
to display the cavity temperature sensor reading. Verify the temperature sensor reading. If
the reading is correct, stop.
8. If the reading is still not correct, unplug microwave oven or disconnect power.
9. Replace ACU PCBA.
10. Replace all parts and panels before operating.
11. Plug in microwave oven or reconnect power.
1. Enter the Diagnostics mode (press CANCEL - CANCEL - START), and then press COOK to
display the humidity sensor reading. If display does not show "8891," continue to Step 2.
2. Unplug microwave oven or disconnect power.
3. Connect a new humidity sensor to the ACU PCBA P6 connector.
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), and then press COOK to see
if failure code reappears.
NOTE: There may be a delay (approximately 1 minute, 20 seconds) before the failure code
is displayed.
7. If the failure code reappears, unplug microwave oven or disconnect power.
8. Replace ACU PCBA.
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 POPCORN.
2. Knock on the microwave oven door no fewer than 12 times within 5 seconds to check if
the counter display operates properly.
3. If the counter does not operate properly, unplug microwave oven or disconnect power.
4. Check to see if the sound channel is blocked or the tube is loosened.
5. If the sound channel and tube are not blocked, connect a new Popcorn cable to the ACU
PCBA.
6. Replace all parts and panels before operating.
7. Plug in microwave oven or reconnect power.
8. If failure code reappears, unplug microwave oven or disconnect power.
9. Replace Popcorn PCBA.
10. Replace all parts and panels before operating.
11. Plug in microwave oven or reconnect power.
12. If failure code reappears, unplug microwave oven or disconnect power.
13. Replace ACU PCBA.
14. Replace all parts and panels before operating.
15. Plug in microwave oven or reconnect power.
DIAGNOSTICS (Cont.)
Microwave Hood Combination
n
2-5