Written by
Tessa Brandt Appliance Care EditorPublished October 29, 2026
VERIFIED
Error code3D21
ApplianceRange
A Maytag range displaying 3D21 may have a problem with the oven temperature sensor, the control, or the associated wiring, according to Maytag. No series is specified.
Do the reset like this
Breaker(s) off for a minute.
Breaker(s) on again.
A minute of watching for 3D21.
A final check that the oven operates.
If it does not clear
Plan on a technician visit. Maytag words 3D21 as a possibility spread over three parts, so the display does not say which one is responsible. Jot down your model number and whether the code returned while you were watching, and pass that to the technician.
Need a hand with 3D21? We serve Maytag range owners in San Francisco and nearby Bay Area towns. Phone (415) 649-2156 and state the code, model number and reset result. Read Maytag range repair for additional detail.
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
Maytag associates 3D21 with a possible problem 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.
