Error code · Wall Oven

Maytag Wall Oven Codes F4 E8 or F4 E9: Microwave Inverter Check

Medium · inspection needed

Code: F4 E8, F4 E9
Appliance: Wall Oven
Brand: Maytag
Warranty: 30-day workmanship

What F4 E8, F4 E9 means

F4 E8 and F4 E9 are two codes from Maytag built-in wall ovens that include a microwave. Both name the microwave inverter, the electronic unit that powers the magnetron, and the wiring that serves it. They are listed together with the same description, so the control seems to be telling us that the inverter circuit is not behaving as expected in one of two ways. Expect the display to show the code and the microwave to stop heating. Baking in the main oven may remain available.

Common causes of F4 E8, F4 E9

The microwave inverter
Wiring and plugs between the inverter and the control
How each code was triggered, at start or during a cycle

✓ One safe check you can try

1. Let the oven sit with its breaker off for a full minute. 2. Turn the breaker back on. 3. Monitor the display for a minute to see whether either code comes back. 4. If clear, test the microwave briefly with a cup of water, and note whether the code appears at the start or partway through.

! Why to stop there

The inverter works at high voltage and is not something to open or test at home
Whether the code appears at once or midway helps us, so tell us when you call
A written quote comes first, and the repair carries a 30-day workmanship warranty

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 Wall Oven codes

Locked, Lock or Loc on a Wall OvenMaytag Wall Oven Display Locked, Lock or Loc: Controls and Door Locked Please Remove and Empty ContainerMaytag Steam Wall Oven Message Please Remove and Empty Container: Drain Finished Probe or Insert Probe on a Wall OvenMaytag Wall Oven Message Probe or Insert Probe: Meat Probe Not Detected Registration ErrorMaytag Wall Oven Message Registration Error: Connection Needed Temperature Reached Insert FoodMaytag Steam Wall Oven Message Temperature Reached Insert Food: Preheat Done F8 E3Maytag Wall Oven Code F8 E3: Oven Cooling Fan, Wiring and Control F8 E4, F8 E5Maytag Wall Oven Codes F8 E4 and F8 E5: Exhaust Fan Air Temperature Sensor F9 or F9 E0Maytag Wall Oven Code F9 or F9 E0: Supply Wiring Polarity

F4 E8, F4 E9F4 E8, F4 E9 questions

Are F4 E8 and F4 E9 different problems?

The description given for both is the same, the microwave inverter and its wiring. The extra digit may show when or how the control noticed it, so tell us which one you saw.

How is this different from F4 E0?

F4 E0 also points at the inverter. The separate codes suggest the control tells apart different moments or conditions. For you the first steps are identical, and we test the same circuit.

Is it safe to use the oven part?

If baking works normally and the microwave section is left off, generally yes. Avoid running the microwave while the code keeps appearing, and call us to inspect the inverter circuit.

Book a visit

Still seeing F4 E8, F4 E9?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 936-6390