Written by
Tessa Brandt Appliance Care EditorPublished October 29, 2026
VERIFIED
Error code3d21
ApplianceWall Oven
Does your Maytag wall oven show 3d21? The help article lists the oven temperature sensor, the control and the wiring between them as possible sources.
Reset with the breaker
Power the oven down at its breaker(s) and let one (1) minute pass. Power it back up. Next, look at the oven for a minute to make sure the error does not return. Finally, check normal operation.
What if 3d21 stays
Persistent 3d21 should go to a technician, since checking a sensor, control or wiring goes beyond an owner reset.
Codes close to 3d21
3d22: sits next to this code with the same sensor wording.
4d21: a different message about airflow, the cooling fan and wiring.
Maytag wall oven service from San Francisco
Our team can arrange Maytag wall oven repair for San Francisco and Bay Area homes on (415) 649-2156. Have 3d21 and the model number ready, and say how the oven behaved after the reset.
Model compatibility: Maytag reuses codes across series and model years, so 3d21 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
3d21 is listed for a possible fault in the oven temperature sensor, control or wiring.
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.
