KitchenAid Combination Oven Microwave Code F1 E4: manager board or power relay

What F1 E4 means

On KitchenAid combination microwave-wall ovens, for example the KOCE500ESS, KOCE507ESS and KOCE900HSS, F1 E4 points to the microwave appliance manager or the microwave power relay, or the wiring to either. The relay supplies power to the microwave heating system, so when it misbehaves the cavity may not heat or the cycle stops with the code displayed.

Common causes of F1 E4

Microwave power relay not switching correctly
Microwave appliance manager board problem
Loose or damaged wiring to either part

✓ One safe check you can try

1. Cancel and open the microwave door briefly, then close it. 2. Switch the unit off at the breaker for sixty seconds. 3. Restore power and try a one-minute run with a cup of water in the cavity. 4. A returning F1 E4 means stop using the microwave and book us.

! Why to stop there

Relay and board both carry mains voltage and need meter testing
A swapped relay may not help if the board is the cause
We state the price in writing and warrant our work 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.

→Same appliance

Other Microwave codes

SEKitchenAid Over-the-Range Microwave Code SE: Keypad or user interface problem Probe or Insert ProbeKitchenAid Combination Microwave Message "Probe" or "Insert Probe": Seat the meat probe in its jack PUSH or PSHKitchenAid Built-In Microwave Message PUSH or PSH: The oven is waiting for Start Registration ErrorKitchenAid Over-the-Range Microwave Message "Registration Error": Check the home network and try again Sabbath, Sab, 5Ab, or 5A6KitchenAid Built-In Microwave Display Sabbath, Sab, 5Ab or 5A6: Sabbath Mode is on F6 E3KitchenAid Built-In Microwave Code F6 E3: Appliance manager and converter control FC E3KitchenAid Over-the-Range Microwave Code FC E3: Router or Wi-Fi module connection lost F6 E7KitchenAid Combination Microwave Code F6 E7: Manager board for the upper cavity

F1 E4F1 E4 questions

What is the microwave power relay?

It is a switch that sends power to the microwave heating system when a cycle starts. A worn relay can stick or fail to close, and the control then shows F1 E4.

Why would food stay cold with the display on?

The control can run while the relay or manager fails to deliver power to the heating side. That fits the F1 E4 description.

Is there a smell or noise to watch for?

Buzzing, clicking without heating, or a burnt smell are good reasons to turn off the breaker and call us at once.