Written by
Elena Marsh Appliance Care EditorPublished October 29, 2026
VERIFIED
Error code21
ApplianceCooktop
Why 21 appears
Your cooktop is telling you the Timer Down key does not work properly. The list is limited to Kenmore induction models whose number starts with 790.
The listed remedy
First the supply is cut. Then comes a look at the harness cables and the connections on them. If those connections test good, a technician fits a new center touch control board.
Technicians cover Kenmore cooktop repair in San Francisco and the Bay Area. Call (415) 825-6393 and have code 21, the model number and a list of your own checks to hand.
Model compatibility: Kenmore reuses codes across series and model years, so 21 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
Code 21 says the Timer Down key is defective.
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 Kenmore 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 Kenmore appliance working again?
Book a repair online or call us — clear estimates and approval before any repair work begins.
