KitchenAid Wall Oven Code F3 E8: lower cavity sensing has dropped out

What F3 E8 means

If F3 E8 shows up on a KitchenAid electric single or double wall oven such as the KOSE500ESS, the electronic oven control is reporting a possible problem with the lower oven temperature sensor, the control, or the wiring. The oven cannot confirm what the lower cavity is doing, so it may stop heating and leave the code on the display.

Common causes of F3 E8

Lower oven temperature sensor no longer reporting correctly
Oven control that misreads or ignores the sensor signal
Worn or loose wiring in the sensor path

✓ One safe check you can try

1. Hit Cancel and wait until the oven is cool to the touch. 2. Flip the breaker off for a minute, then restore power. 3. Start a short test bake. 4. If F3 E8 is back, do not keep retrying. Call us so the sensor circuit can be tested safely.

! Why to stop there

Three different parts can produce this one message.
Panels on a built-in oven should only be opened with the power fully isolated by a technician.
Our quotes are written before work begins, and the repair is warranted for 30 days.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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F3 E8F3 E8 questions

Does F3 E8 mean the oven will not heat at all?

Often the oven stops or refuses a cycle, because it will not heat without a temperature reading it trusts. Some owners see it only on certain cycles, but the safe move is to stop using the oven.

Could a power outage have caused this?

A brief power event might post a one-time code that clears on reset. If F3 E8 comes back after you reset the breaker and run a cycle, the circuit has a real problem.

Do you carry sensors for these ovens?

We confirm the cause first, then quote the sensor, control or wiring repair that fits. Nothing is ordered until you have approved the written price.