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Error code reference

Maytag Oven Error Code F-21

Induction cooktop supply power frequency error (Type 2 failure, affects all burners on that IPC).

Maytag codesMaytag oven codes

Induction cooktop supply power frequency error (Type 2 failure, affects all burners on that IPC).

First step from the service manual

Unplug range or disconnect power, replace the Induction Power System (IPS). If issue persists, contact electrician to verify 60 Hz supply.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F-21 means on a Maytag oven

The F-21 error code on a Maytag induction range indicates a supply power frequency error detected by the Induction Power Control (IPC) system. Specifically, this is classified as a Type 2 failure, meaning the IPC has detected that the incoming AC frequency is outside the acceptable range for proper induction operation. Because the IPC manages all burner elements on that module, a Type 2 failure will disable every induction burner associated with that IPC simultaneously. The error is not a cooking sensor fault or a surface element burnout; it is fundamentally a power quality issue at the IPC level.

Induction cooktops require a stable 60 Hz AC supply to synchronize their internal switching circuits. When the IPC detects a frequency that deviates from this specification, it throws the F-21 code and shuts down the affected burner group as a protective measure. The root cause can be either an internal failure within the Induction Power System (IPS) hardware itself, which may misread or fail to regulate the frequency signal, or an actual power supply problem coming from the home's electrical panel or utility feed.

Diagnosing this code starts with disconnecting power to the range and replacing the IPS unit. If the error returns after IPS replacement, the frequency problem originates upstream from the appliance, and a licensed electrician should measure the supply frequency at the range outlet or junction box to confirm the utility is delivering a proper 60 Hz signal. Fluctuations caused by generator power, certain solar inverter setups, or utility grid instability can all trigger this code.

Source: manufacturer service documentation.

Common causes of F-21

  1. 01

    Failed Induction Power System (IPS) module

    Part replacement

    The IPS module internally monitors supply frequency, and an internal component failure can cause it to misread or fail to process the 60 Hz signal correctly, triggering F-21. Replacing the IPS is the primary diagnostic step because this is the most common hardware source of the fault.

  2. 02

    Unstable or out-of-specification utility power frequency

    Wiring / connection

    If the home's electrical supply is delivering a frequency outside the normal 60 Hz range, the IPC will detect it and shut down the induction burners. This can occur with generator power, certain inverter-based solar setups, or utility grid disturbances, and requires an electrician to measure and confirm the supply frequency.

  3. 03

    Loose or degraded power connections at the range

    Wiring / connection

    A loose terminal connection at the range's power cord, junction box, or internal wiring harness can cause voltage irregularities that affect frequency sensing. Inspecting and securing all power connections after disconnecting power may help rule this out before component replacement.

  4. 04

    IPS wiring harness fault

    Wiring / connection

    A damaged or poorly seated wiring harness between the IPS module and the main control board can disrupt frequency signal communication, causing a false or persistent F-21 error. Inspecting harness connectors for corrosion, damage, or improper seating is recommended when replacing the IPS.

See the test procedure for each cause

Frequently asked questions about F-21

What does F-21 mean on a Maytag oven?
F-21 on a Maytag induction range is a supply power frequency error affecting the Induction Power Control system. It is classified as a Type 2 failure, which means all induction burners on the affected IPC module are disabled. The code indicates the IPC detected a frequency outside the acceptable 60 Hz specification, either due to a faulty Induction Power System module or an upstream electrical supply issue.
Can I fix the F-21 error myself?
The first step is to unplug the range or disconnect power, then replace the Induction Power System module. This repair involves working with high-voltage components, so comfort with appliance disassembly and electrical safety practices is important. If the error persists after replacing the IPS, the issue is with the home's electrical supply and requires a licensed electrician, not further DIY work on the appliance.
Will resetting the oven clear the F-21 code?
Disconnecting power to the range may temporarily clear the F-21 code, but if the underlying cause, such as a failed IPS module or an out-of-specification power supply, is not corrected, the error will return once the appliance is powered back on. A reset alone is not a fix for this code.
Is it safe to use the oven while F-21 is displayed?
The F-21 code specifically disables all induction burners on the affected IPC module, so surface cooking will not be available. If your range also has a separate oven cavity, that function may still operate depending on the model, but you should resolve the power frequency issue before relying on the appliance further. Continuing to run the range with a known power quality problem is not recommended.
How much does it cost to repair a Maytag F-21 error?
If the fix requires replacing the Induction Power System module, parts and labor costs typically range from $150 to $400 or more depending on the specific model and local labor rates. If the problem turns out to be the home's electrical supply, electrician diagnostic and repair costs will vary separately based on what is found. Getting a diagnostic estimate from a certified technician before committing to repairs is advisable.

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