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Error code reference

KitchenAid Microwave Error Code F4

Temperature probe is not plugged into the jack or its wires are not properly connected.

KitchenAid codesKitchenAid microwave codes
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What the F4 error code actually means

Your KitchenAid microwave is showing F4 because it cannot detect the temperature probe that is used to measure food temperature during cooking. This usually means the probe is not plugged in all the way, or it is not plugged in at all when a probe cooking mode is selected. Try firmly inserting the probe into the port inside the microwave, or cancel the probe cooking mode if you are not using it.

Diagnostic procedure

The full F4 procedure

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1
First diagnostic step
Check the temperature probe connection at the jack and verify wiring continuity to the control board.
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Most common causes of F4

Ranked by how often they cause this code
  1. 1Probe not plugged into the jack
  2. 2Loose or incomplete probe connection
  3. 3Damaged probe connector or jack
  4. 4Broken or faulty temperature probe
  5. 5Wiring continuity failure between jack and control board

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Questions people ask about F4

What does F4 mean on a KitchenAid microwave?
F4 indicates that the control board cannot detect the temperature probe in the probe jack circuit. This happens when the probe is not plugged into the jack on the interior cavity wall, is only partially connected, or when there is a wiring fault between the jack and the control board. It can also appear if a probe cooking mode is selected without attaching the probe.
Will resetting my KitchenAid microwave clear the F4 error?
Resetting the microwave by unplugging it for a minute may temporarily clear the display, but the F4 code will return if the underlying issue is not resolved. The control board will re-detect the missing or faulty probe signal as soon as a probe cooking mode is initiated again. The root cause, whether a disconnected probe or a wiring fault, must be corrected for the error to stay cleared.
How much does it cost to repair a KitchenAid microwave F4 error?
If the fix is simply reseating or replacing the temperature probe, costs are generally low, with replacement probes typically ranging from around 15 to 50 dollars. If the probe jack or the wiring harness is damaged and requires replacement, parts and labor from a technician could range from 80 to 200 dollars depending on the specific model and the extent of the repair.
How do I fix the F4 error on my KitchenAid microwave?
Start by checking whether the temperature probe is fully inserted into the jack located on the interior cavity wall. If you are not using the probe, cancel any probe-based cooking cycle and select a standard mode instead. If the probe is connected and the error persists, inspect the probe and jack for damage and test the wiring harness for continuity back to the control board.
Is it safe to use my KitchenAid microwave while it shows F4?
If the F4 code appears during a probe cooking cycle, that cycle cannot complete accurately because the control board has no temperature feedback. You can typically still use standard timed cooking modes that do not rely on the probe. However, avoid attempting to use probe-based cooking functions until the connection issue is resolved.

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