Booking today · Houston service windows 9–12 · 1–4 · 4–7 Independent Whirlpool specialists · Licensed & insured Mon–Fri 7:00 AM - 8:00 PM · Sat 8:00 AM - 6:00 PM
(713) 589-6107 Book a Service Call
Error code · Cooktop

Whirlpool Older Smoothtop Cooktop Code F21: Power Frequency Out of Range

F21 on an older Whirlpool electric radiant (smoothtop) cooktop, such as the WCE55US6HS, points to a problem with the frequency of the power supply. The control is seeing electricity that is not behaving as it expects.…

High · stop use, call now
Book a Service Call(713) 589-6107
Code
F21
Appliance
Cooktop
Brand
Whirlpool
Warranty
30-day workmanship

What F21 means

F21 on an older Whirlpool electric radiant (smoothtop) cooktop, such as the WCE55US6HS, points to a problem with the frequency of the power supply. The control is seeing electricity that is not behaving as it expects. This is an older model still in many Houston homes, and we repair it. We tell you plainly if a repair is not worth it. Start with a power reset, and watch the display for a minute.

Common causes of F21

  • Unsteady incoming power at the cooktop
  • Control circuit that measures the supply wrongly
  • Loose connection in the cooktop's power feed
✓ One safe check you can try

1. Turn all surface controls off. 2. Switch the breaker off, wait a minute, and turn it back on. 3. Monitor the display for one minute. 4. Check whether other appliances on the same circuit act strangely. 5. If F21 returns, leave the cooktop off.

! Why to stop there
  • If F21 returns, we check the supply to the cooktop and then the control that reads it.
  • We separate a house power issue from a cooktop issue, because the fixes differ.
  • The price is in writing before work, and a 30-day workmanship warranty covers our repair.
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

FCRFWhirlpool Cooktop Code FCRF Means a Right Front Element Circuit Problem HWhirlpool Induction Cooktop H: Hot Cooking Zone Indicator Lights Not Turning OnWhirlpool Smoothtop Cooktop Indicator Lights Not Turning On: No Power or Dead Controls Indicator or Display FlashingWhirlpool Cooktop Indicator or Display Flashing: Pressed Keys or an Unsuitable Pan Indicator or Hot Light OnWhirlpool Smoothtop Cooktop Hot Light On: Control Still on or Glass Still Hot LockWhirlpool Smoothtop Cooktop Lock: Control Lock Is on Performance Boost FlashingWhirlpool Induction Cooktop Performance Boost Flashing: Zone Limited Power Level Lower Than Level RequestedWhirlpool Induction Cooktop Power Level Lower Than Requested, a Power Limit at Work
F21F21 questions
Is F21 a house wiring problem?

It can be, or the cooktop's own control can misread good power. We test both before suggesting a repair. We test both before suggesting any repair.

Is it safe to cook while F21 shows?

We advise against it. Power that is not steady can make an electric cooktop behave unpredictably, and nobody wants that over a hot surface. Leave it off until the power is checked.

Is an older cooktop worth fixing for this?

Sometimes it is. We quote the cost in writing and say so clearly when replacement would be wiser for a cooktop of that age. Age alone does not decide it.

Book a visit

Still seeing F21?

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

(713) 589-6107