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Error code · Cooktop

Maytag Electric Cooktop Code F21: Supply Frequency or Overheating

F21 on a Maytag electric cooktop has two documented meanings. On the electric cooktop page it means a problem with the power supply frequency. On the radiant cooktop page it means the cooktop may be overheating,…

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Code
F21
Appliance
Cooktop
Brand
Maytag
Warranty
30-day workmanship

What F21 means

F21 on a Maytag electric cooktop has two documented meanings. On the electric cooktop page it means a problem with the power supply frequency. On the radiant cooktop page it means the cooktop may be overheating, so the installation should be verified and the cooktop allowed to cool for about 5 minutes. You see F21 and the heat may stop. Either way, the brand's instruction is to cycle the breaker for one minute and watch the cooktop.

Common causes of F21

  • Supply frequency or power quality issue
  • Overheating from restricted airflow or poor clearance
  • Control reading a sensor value as too high
  • Wiring or connection to the cooktop
✓ One safe check you can try

1. Turn off all surface controls and give the cooktop about 5 minutes to cool. 2. Reset the cooktop's power with a one minute break at the breaker(s). 3. Wait a minute; F21 may or may not reappear. 4. If it does, leave the cooktop off and call us.

! Why to stop there
  • We first work out whether it is a supply matter or a heat matter on your cooktop
  • We check airflow and installation clearance, then the supply and the control
  • You approve a written price first
Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.
→Same appliance

Other Cooktop codes

FC E4Maytag Cooktop Code FC E4: Harness Between Touchpad and Induction Module FC LF, FC LR, FC RF or FC RRMaytag Cooktop Codes FC LF, FC LR, FC RF and FC RR: A Hotplate or Its Wiring H or HOTMaytag Cooktop Code H or HOT: Surface Still Too Hot to Touch Indicator Lights Not Turning OnMaytag Cooktop Indicator Lights Not Turning On: Panel Dark with Power Present Indicator or Display FlashingMaytag Cooktop Indicator or Display Flashing: A Held Key or the Wrong Pan Indicator or Hot Light OnMaytag Cooktop Indicator or Hot Light On: Control Left on or Element Hot LockMaytag Cooktop Lock: Control Lock Is on Other F CodeMaytag Cooktop Other F Codes: Touchpad, Power Board or Wiring
F21F21 questions
Why are there two meanings?

Different cooktop versions use F21 for different conditions. The electric page names the supply frequency and the radiant page names overheating, so we identify your model and test which one applies.

What does supply frequency mean?

The cooktop expects the power to alternate at a steady rate. If the control sees something outside that, it stops and shows a code. A test of the supply shows whether that is the case.

Is it safe to try again after the reset?

A short test is reasonable once the cooktop has cooled and the breaker has been reset. If F21 comes back, stop using it and call us so we can test the supply, the installation, and the control.

Book a visit

Still seeing F21?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 936-6390