KitchenAid · Cooktops
KitchenAid cooktop F21: The power-supply frequency is outside the expected condition
THE SHORT ANSWER
The power-supply frequency is outside the expected condition.
KitchenAid identifies F21 with this condition: The power-supply frequency is outside the expected condition.
Record F21 and the model number before trying the manufacturer’s power reset.
Keep covers installed. Internal electrical testing and component replacement require qualified service.
WHAT YOU MAY NOTICE
Symptoms to record
- F21 appears on the appliance display.
UNDERSTAND THE POSSIBILITIES
Causes & useful observations
A code identifies a condition. It does not, by itself, confirm which part needs repair.
| Possible cause | What to look for | Safe check / next step |
|---|---|---|
| Supply frequencyService may be needed | The F21 code points to this area without identifying a confirmed failed part. | Give the exact code and model to KitchenAid service. |
WORK THROUGH THE BASICS
Safe troubleshooting checks
Use the checkboxes to keep track as you read. Stop at any warning or step that does not match your appliance.
Switch the appliance circuit breaker off for one minute, then restore power.
What to noteThe control restarts.
Watch the cooktop for one minute. Record a returning code and whether normal operation resumes.
What to noteA recurring message needs diagnosis; resetting alone does not prove a repair.
THE DETAILS MATTER
Scope & troubleshooting notes
Scope matters
A frequency warning is not permission to change the electrical connection. Have supply concerns assessed by a qualified electrician.
YOUR NEXT DECISION
When to stop and get help
Arrange service if F21 persists or returns after the documented owner check.
THE EVIDENCE
Sources & verification
Our explanations are editorial summaries of the documentation below. They do not replace the instructions for your exact appliance.
- F21 - Electric Cooktop
KitchenAid · Manufacturer support · Checked
Code-specific explanation and owner troubleshooting — KitchenAid cooktop families covered by the cited manufacturer support pages; confirm the complete model before applying guidance.