KitchenAid Combination Oven Code F1 E4: microwave manager or power relay

What F1 E4 means

For KitchenAid combination microwave-wall ovens such as the KOCE900HSS, F1 E4 means the microwave appliance manager or the microwave power relay, or the associated wiring, may have a problem. The relay switches microwave power on and off, so the microwave may not produce energy even though the display lights up and the timer counts. The timer may count down normally even though no microwave energy is produced.

Common causes of F1 E4

Microwave power relay stuck or failed
Microwave appliance manager board failing
Wiring between the relay and manager damaged

✓ One safe check you can try

1. Remove any container and press Cancel. 2. Cycle the breaker off for one minute, restore it, and set the microwave to run thirty seconds with a cup of water inside. 3. Feel whether the water warmed. 4. If F1 E4 shows again or the water stays cold, stop using the microwave and call.

! Why to stop there

Relay switching happens at line voltage.
The microwave section stores a dangerous charge.
Never run the microwave empty while testing.

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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F1 E4F1 E4 questions

Why does the microwave count down but not heat?

A relay that fails to close lets the display and timer run while no power reaches the magnetron circuit. That pattern fits the F1 E4 description. A cup of water absorbs the energy safely, so a short run with one is a harmless way to see whether heat appears.

Is running the microwave to test it risky?

Only with food or a cup of water inside. Never run it empty, because there is nothing to absorb the energy. Only with a cup of water or food inside, because an empty cavity has nothing to absorb the energy.

Do you replace relays?

Yes, after testing. You get a written price first and a 30-day warranty. Relays are routine parts for us, and the price is agreed before we replace one.