Written by
Tessa Brandt Appliance Care EditorPublished October 29, 2026
VERIFIED
Error codeF3H
ApplianceMicrowave
What F3H is telling you
The humidity thermistor, or the wiring that connects it, is what F3H calls out. The entry applies to over-the-range models.
Power reset
Turn the microwave’s breaker to off; count to sixty before touching it.
Switch the breaker to on.
Keep an eye on the display for a minute to see if F3H comes back.
Use the microwave to check that it works.
What to do if it comes back
A code that returns after the reset calls for a technician visit.
Other codes worth comparing
F3H1 concerns the humidity sensor rather than the thermistor. F3C is the one for the cavity temperature thermistor, and F4 E4 also names the humidity thermistor.
Microwave service in San Francisco
If you live in San Francisco or elsewhere in the Bay Area, Maytag microwave repair can be arranged at (415) 649-2156. Say the code is F3H, give the model number and mention the reset.
Model compatibility: Maytag reuses codes across series and model years, so F3H 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
The humidity thermistor or its associated wiring may have a problem.
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 Maytag appliance?
Book a specialist visit for a clear estimate and approval before any repair.
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
Yes. We provide an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work, so there are no surprise charges.
Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
Service areas are listed on the Locations page. Contact us with your ZIP code to confirm current coverage for your address.
Ready to get your Maytag appliance working again?
Book a repair online or call us — clear estimates and approval before any repair work begins.
