On this Frigidaire cooktop & induction cooktop platform, 21 is recorded as Touch-control key/sensor channel issue on a legacy induction platform; exact key or zone depends on model configuration. Keep the complete model number with the code before treating it as a parts decision.
Written by
Daniel Reyes Appliance SpecialistPublished September 11, 2026
Content status:
Verified
Error code21
ApplianceCooktop & Induction Cooktop
Affected model seriesLegacy Frigidaire induction cooktop platform
Quick answer
21 — Touch-control key/sensor channel issue on a legacy induction platform; exact key or zone depends on model configuration
Model compatibility: Frigidaire 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
21 is a control-reported condition, not an automatic proof that one component has failed. Wiring, sensors, airflow, water, mechanical restrictions and the control itself can produce similar displays.
Touch-control key/sensor channel issue on a legacy induction platform; exact key or zone depends on model configuration. Platform note: Legacy Frigidaire induction cooktop platform. Confirm the exact model family before applying a service procedure from another Frigidaire generation.
Signs
Symptoms you may notice
The appliance may show this behavior: code returns after a restart or at the same point in a cycle.
The appliance may show this behavior: buttons, cycle selection, relays, or stored configuration may not behave normally.
The appliance may show this behavior: affected function may be disabled while other functions still operate.
The appliance may show this behavior: appliance may enter a protective state to prevent additional damage.
Why it happens
Possible causes
Diagnosis may need to consider temporary control-state error — that possibility is not a confirmed failed part.
Diagnosis may need to consider stuck or contaminated input — that possibility is not a confirmed failed part.
Diagnosis may need to consider loose control-board connector — that possibility is not a confirmed failed part.
Diagnosis may need to consider corrupted configuration/memory — that possibility is not a confirmed failed part.
Diagnosis may need to consider failed UI, relay board, or main control — that possibility is not a confirmed failed part.
Before you call
Safe checks you can make
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
Power-cycle the appliance once. Stay within normal owner access and stop if a safety warning appears.
Make sure no key is being held down by an object, moisture, or residue. Stay within normal owner access and stop if a safety warning appears.
Do not replace a control board based only on the code without confirming the model-specific service sheet. Stay within normal owner access and stop if a safety warning appears.
If the code returns immediately, professional diagnosis is appropriate. Stay within normal owner access and stop if a safety warning appears.
Do not bypass door or lid locks, open sealed refrigeration systems, service microwave high-voltage sections, or dismantle internal gas or induction power modules.
Important safety warning. Stop using the appliance for smoke, arcing, a burning-electrical smell, repeated breaker trips, uncontrolled heating, or water reaching electrical parts. For persistent gas odor, leave the area and follow local gas-emergency guidance. Do not dismantle internal gas or induction power modules.
Get help
When to call a technician
If 21 returns after the safe external checks, or the appliance shows a safety warning, professional diagnosis is appropriate. A technician should confirm the Frigidaire model and test the implicated system rather than replacing a part from the code description alone.
Seeing this code on your Frigidaire appliance?
Book a specialist visit for a clear estimate and approval before any repair.
Touch-control key/sensor channel issue on a legacy induction platform; exact key or zone depends on model configuration That technical note still has to be confirmed against the exact model and control generation.
Record the code first. One controlled reset can be reasonable when there is no safety warning. Repeated resets are not a repair.
No. The code can point to a system while the failed item is wiring, a restriction, a sensor, or another connected component.
References
Sources & references
**Frigidaire Service Tech Handbook — Electrolux Home Products** — manufacturer service handbook mirror https://manualzilla.com/doc/6030612/frigidaire-service-tech-handbook---atech-appliance-repair... This page paraphrases diagnostic information rather than reproducing service-manual text. Model-specific documentation takes precedence if it conflicts with a general guide.
Ready to get your Frigidaire appliance working again?
Book a repair online or call us — clear estimates and approval before any repair work begins.
