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Error code reference

Whirlpool Cooktop Error Code F-12

Coil under current

Whirlpool codesWhirlpool cooktop codes

Coil under current — failure originates from the power control board and affects only one burner (Type 1).

First step from the service manual

Disconnect power and check for the correct connections at T2A - T2B or T3A - T3B on the power control board (whichever connection the burner is plugged into).

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

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What F-12 means on a Whirlpool cooktop

The F-12 error code on a Whirlpool cooktop indicates a coil under-current condition affecting a single induction or radiant burner. The failure is traced to the power control board, specifically at the terminal connections designated T2A/T2B or T3A/T3B, depending on which burner circuit is involved. An under-current fault means the control board is detecting less current flowing through the coil than it expects during operation, which can indicate a break in the circuit, a poor connection, or a component that is not drawing power correctly.

The power control board governs the energy delivery to each individual burner, and when it monitors a coil circuit and finds current below its expected threshold, it shuts down that burner and triggers F-12 to protect both the cooktop and the user. Because this code is classified as Type 1 and is isolated to one burner, the fault is not a global board failure but rather a localized problem within one specific output channel of the board.

The first step in diagnosing F-12 is to disconnect power to the unit and physically inspect the wiring harness connections at T2A/T2B or T3A/T3B on the power control board. Loose, corroded, or improperly seated connectors at these terminals are a common root cause. If connections are secure and in good condition, the fault may point to a failed burner coil assembly or a damaged output circuit on the power control board itself.

Source: manufacturer service documentation.

Common causes of F-12

  1. 01

    Loose or disconnected wiring at T2A/T2B or T3A/T3B

    Wiring / connection

    A harness connector that has worked loose from the T2A/T2B or T3A/T3B terminals on the power control board will interrupt current flow and trigger F-12. Inspect these connections carefully after disconnecting power, reseating any connector that is not fully engaged.

  2. 02

    Corroded or damaged connector terminals

    Part replacement

    Corrosion or heat damage at the T2A/T2B or T3A/T3B terminal connections can increase resistance and reduce current to the level that trips the under-current fault. Look for discoloration, pitting, or melted plastic near those terminals.

  3. 03

    Failed burner coil assembly

    Part replacement

    If the burner coil itself has an internal open or a break in its winding, it will not draw the expected current and the board will log F-12 for that channel. A failed coil requires replacement of the burner element.

  4. 04

    Damaged wiring harness between burner and board

    Part replacement

    A pinched, burned, or broken wire in the harness routing between the affected burner and its board terminals can reduce or eliminate current flow. Trace the harness from the burner connection point back to the control board and check for visible damage.

  5. 05

    Failed power control board output channel

    Part replacement

    If connections and the burner coil both check out, the output circuit on the power control board responsible for that burner may have failed internally. This would require replacement of the power control board.

See the test procedure for each cause

Frequently asked questions about F-12

What does F-12 mean on a Whirlpool cooktop?
F-12 indicates a coil under-current fault on a single burner circuit. The power control board detected that one burner coil is drawing less current than expected during operation. The cooktop disables that burner and displays F-12 to alert you to the problem. The failure originates at the power control board and affects only one burner.
Can I fix F-12 myself on my Whirlpool cooktop?
The first diagnostic step is something many handy homeowners can handle: disconnect power to the cooktop and check that the wiring harness connectors at T2A/T2B or T3A/T3B on the power control board are fully seated and undamaged. If a loose connection is the cause, reseating the connector may resolve the fault. If the burner coil or the power control board itself has failed, those repairs involve higher-voltage components and are best handled by a qualified technician.
Is it safe to keep using my Whirlpool cooktop with an F-12 error?
The cooktop disables the affected burner when F-12 is active, so the faulted burner will not operate. While other burners may still function, using any appliance in a fault state is not recommended without diagnosing the root cause first. Have the unit inspected before returning it to regular use.
Will resetting the cooktop clear the F-12 error?
Disconnecting power briefly may temporarily clear the error display, but the code will return if the underlying cause has not been corrected. A loose connection that is reseated properly can result in a permanent fix, but a failed coil or damaged board will cause F-12 to reappear as soon as that burner is activated again.
How much does it cost to repair a Whirlpool cooktop F-12 error?
Repair costs depend on the root cause. If only a wiring connection needs to be reseated, the cost may be limited to a service call fee, typically in the range of $75 to $150. A replacement burner coil assembly generally runs $50 to $150 for the part, while a new power control board can cost $150 to $400 or more depending on the model. Labor charges will add to these figures if a technician performs the repair.

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