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Error code reference

Whirlpool Cooktop Error Code F-43

Under voltage on induction cooktop (Type 2 failure).

Whirlpool codesWhirlpool cooktop codes

Under voltage on induction cooktop (Type 2 failure).

First step from the service manual

Unplug range or disconnect power. Check the AC voltage with a multimeter to determine if voltage is above 196 volts.

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

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What F-43 means on a Whirlpool cooktop

The F-43 error code on a Whirlpool induction cooktop indicates an under-voltage condition, classified as a Type 2 failure. This means the control board has detected that incoming AC line voltage has dropped below the minimum threshold required for safe induction operation. Induction cooktops are particularly sensitive to voltage fluctuations because the inverter circuits that power the induction coils require stable, sufficient voltage to generate the electromagnetic field used for cooking. When voltage falls below 196 volts, the unit flags this fault and disables operation to prevent damage to internal components.

The most direct cause is insufficient voltage at the wall outlet or junction box supplying the cooktop. This can result from a weak utility feed, a shared circuit with heavy loads pulling voltage down, a partially failed breaker, loose or corroded wiring connections in the supply circuit, or a utility grid issue affecting the home. The cooktop itself may be functioning correctly, with the fault originating entirely in the electrical supply infrastructure.

Diagnosing this fault begins with disconnecting power and then using a multimeter to measure the actual AC voltage at the supply. The reading must be above 196 volts for the cooktop to operate within spec. If voltage is within range and the error persists after restoring power, the issue may lie with the control board or its voltage sensing circuit rather than the supply itself.

Source: manufacturer service documentation.

Common causes of F-43

  1. 01

    Low utility supply voltage

    Wiring / connection

    The incoming voltage from the utility grid may be below the 196-volt minimum required by the cooktop. This can happen during peak demand periods or due to a weak connection at the utility transformer serving your home.

  2. 02

    Partially failed or weak circuit breaker

    Part replacement

    A breaker that has degraded over time may allow current to pass but cause a significant voltage drop under load. Measure voltage at the outlet with the cooktop connected to check for voltage drop under load.

  3. 03

    Loose or corroded wiring connections

    Wiring / connection

    Loose connections at the outlet, junction box, or breaker panel can cause resistance in the circuit, resulting in voltage drop below the acceptable threshold. Inspect all connections in the supply circuit for tightness and corrosion.

  4. 04

    Overloaded shared circuit

    Wiring / connection

    If the cooktop circuit is shared with other high-draw appliances, simultaneous operation can pull the voltage below 196 volts. Verify the cooktop is on a dedicated circuit sized appropriately for the unit.

  5. 05

    Faulty control board voltage sensing circuit

    Part replacement

    If the AC supply voltage measures above 196 volts and the error persists after restoring power, the voltage sensing circuit on the control board may be reading incorrectly. In this case, the control board itself may need to be replaced.

See the test procedure for each cause

Frequently asked questions about F-43

What does F-43 mean on a Whirlpool cooktop?
F-43 indicates an under-voltage condition on the induction cooktop, categorized as a Type 2 failure. The cooktop's control board has detected that incoming AC voltage has dropped below 196 volts, which is the minimum required for safe induction operation. The unit shuts down automatically to protect internal components from damage caused by insufficient voltage.
Can I fix the F-43 error myself?
Some causes of F-43 are DIY-friendly. Start by disconnecting power and using a multimeter to measure the AC voltage at the supply. If the voltage reads below 196 volts, the problem is in your home's electrical supply and may require an electrician. If voltage is adequate and the error keeps returning, a faulty control board is likely involved, which typically requires a technician to replace.
Is it safe to use my Whirlpool induction cooktop while the F-43 error is displayed?
No, you should not attempt to bypass or ignore the F-43 error. The cooktop has disabled itself because operating under low voltage can damage the induction inverter circuits and other internal components. Continued use under low-voltage conditions could result in component failure or create a safety hazard.
Will resetting the cooktop clear the F-43 error code?
Unplugging the cooktop or disconnecting the circuit breaker will reset the control board, and the error may temporarily clear. However, if the underlying voltage problem has not been resolved, the F-43 code will return as soon as the unit detects low voltage again. A reset alone is not a fix, it is only a starting point for diagnosis.
How much does it cost to repair an F-43 error on a Whirlpool induction cooktop?
Repair costs vary depending on the root cause. If the problem is a loose wiring connection or a tripped breaker, costs may be minimal. If a licensed electrician is needed to address a supply voltage issue, expect to pay in the range of $100 to $300 or more depending on the work involved. If the cooktop's control board requires replacement, parts and labor combined typically range from $200 to $500 or higher depending on the specific model.

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