Published September 2, 2026Updated October 17, 2026
Content status:
Verified
Error codeF03 / F04
ApplianceMicrowave
Quick answer
F03 and F04 carry one JennAir message on built-in microwaves: electronic oven control or wiring.
Model compatibility: JennAir reuses codes across series and model years, so F03 / F04 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
F03 and F04 both list a possible problem with the electronic oven control or its wiring.
Two numbers, one message: if a JennAir built-in microwave shows F03 or F04, the help page suggests trouble with the Electronic Oven Control or with wiring connected to it. The numbers get identical treatment and no cause is given.
Meaning of the name
The electronic oven control handles the running of the microwave. With wiring named next to it, JennAir is steering you toward the control end of the appliance, not toward one moving part such as a door or a fan. How the control went wrong is not covered.
Reset as listed
Switch the breaker off.
Leave it a full minute.
Switch the breaker on.
Spend a minute observing whether the code comes back.
Check the microwave operates.
Code back again
Get a qualified technician involved. The page has nothing an owner can repair on a control or its wiring. Until then, keep the cabinet closed, since a microwave’s interior is hazardous even switched off.
Similar control entries
JennAir spells the control differently from code to code, so the exact name is worth noting:
F0E0: a piece of the oven control system, or the Electronic Control
F03 or F04?
Is there a different fix for each? No: JennAir gives the same control, the same wiring and the same reset.
Can I test the wiring? The page lists no owner check, and the wiring is inside the unit.
Control repair in Los Angeles
When F03 or F04 returns, call (310) 622-9465. Be ready with the code and the microwave’s model details. The microwave service page lists what we cover.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your JennAir appliance?
Book a specialist visit for a clear estimate and approval before any repair.
