Whirlpool Microwave E22 Error Code — What It Means
The E22 error code on a Whirlpool over-the-range microwave indicates a shorted thermal sensor circuit reported to the control board. The control sees the sensor circuit as electrically out of range on the low-resistance side. Whirlpool groups this code in the same fault family as sensor, appliance control board, or wiring problems, so the code does not point to a single part by itself.
Common Causes
- Failed thermal sensor or thermistor The sensor in the cavity or thermal monitoring circuit has shorted internally.
- Damaged, pinched, or loose wiring harness The wiring between the sensor and control board is disconnected, pinched, or has damaged insulation.
- Faulty appliance control board The board is misreading the sensor circuit or has failed internal circuitry.
- Overheating history exposing weak connections Prior overheating can reveal a marginal sensor or wiring fault, though it is not the root cause of E22.
Step-by-Step Fix
- Turn off the circuit breaker for the microwave and wait one full minute, then turn it back on and monitor for another minute to see if E22 returns.
- Verify normal operation if the code does not reappear by testing heating and keypad functions.
- Unplug the microwave and remove the cabinet if the code returns, then inspect the thermal sensor circuit, connectors, and harness routing for damage, loose connections, or discoloration.
- Test the thermal sensor at the harness or board interface to check for a short or out-of-spec reading (consult your model’s service manual for resistance values).
- Replace the thermal sensor if it tests shorted or outside specification.
- Inspect the appliance control board if the sensor and wiring test normal, and replace the board if diagnostics point to a board-level fault.
- Reassemble the microwave, restore power, and run a test cycle to confirm the error is cleared.
Parts Often Needed
| Part | Notes |
|---|---|
| Thermal sensor or thermistor | Amazon | Replace if the sensor tests shorted or out of specification. |
| Appliance control board | Amazon | Replace if the sensor and wiring test normal but the fault persists. |
| Wiring harness or connector | Amazon | Repair or replace if damaged, pinched, or corroded. |
When to Call a Pro
Call a qualified appliance technician if you are not comfortable working with live electrical components, disassembling the microwave cabinet, or using a multimeter to test sensor circuits. The thermal sensor and control board are located inside the unit and require safe handling of high-voltage wiring. If the error returns after a power reset or if you find no obvious wiring damage, a technician can isolate the fault with proper test equipment and replace the correct component.