mypros+
Error code reference

Fisher & Paykel Cooktop Error Code F12.5

SMPS not turning off

Fisher & Paykel codesFisher & Paykel cooktop codes

SMPS not turning off - Power supply is still on 10 seconds after it has been switched off.

First step from the service manual

Check main PCB power supply board.

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

MyPros+ Max

Get the full diagnostic procedure for F12.5.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What F12.5 means on a Fisher & Paykel cooktop

Error code F12.5 on a Fisher & Paykel cooktop indicates that the Switched Mode Power Supply (SMPS) has failed to shut down within the expected timeframe. Specifically, the control system has detected that the power supply board remains active 10 seconds after a shutdown command has been issued. The SMPS is responsible for converting mains voltage into the lower DC voltages required by the cooktop's control electronics. When this supply cannot be switched off on command, it represents a failure in the regulation or control circuitry rather than a simple power interruption.

The main PCB power supply board is the primary component to inspect when F12.5 appears. This board contains the switching transistors, feedback loops, and control ICs that govern when the SMPS activates and deactivates. A fault in any of these elements, such as a shorted switching component, a failed feedback resistor, or a damaged control IC, can cause the supply rail to remain energized beyond the allowable window. The cooktop's firmware monitors this shutdown sequence and triggers F12.5 when the timeout threshold is exceeded.

Common contributing factors include component-level failures on the power supply board such as failed capacitors, shorted MOSFETs or transistors, or degraded optocouplers that handle the isolation between control and power circuits. Intermittent wiring faults between the main PCB and the power supply section can also cause this fault by disrupting the shutdown signal path. Because this fault involves the power regulation system, it typically requires board-level diagnosis or replacement rather than a simple reset procedure.

Source: manufacturer service documentation.

Common causes of F12.5

  1. 01

    Failed main PCB power supply board

    Part replacement

    The power supply board itself is the most likely source of F12.5. Internal component failures such as shorted switching transistors, failed MOSFETs, or damaged control ICs can prevent the SMPS from responding to the shutdown command.

  2. 02

    Faulty capacitors on the power supply board

    Part replacement

    Electrolytic capacitors on the SMPS board can degrade or fail, disrupting voltage regulation and feedback circuits. Visually inspect for bulging, leaking, or corroded capacitor tops as a starting point.

  3. 03

    Degraded or failed optocoupler

    Part replacement

    Optocouplers provide isolation between the low-voltage control signals and the power switching circuitry. A failed optocoupler can block the shutdown signal from reaching the switching stage, keeping the supply energized.

  4. 04

    Wiring or connector fault between PCB and power supply

    Wiring / connection

    Loose, corroded, or damaged connectors between the main control PCB and the power supply board can interrupt the shutdown signal path. Inspect all relevant harness connections for secure seating and corrosion.

  5. 05

    Main PCB control circuit failure

    Part replacement

    If the main PCB is failing to generate the correct shutdown signal, the power supply board will never receive the command to turn off. This can occur due to firmware issues or damage to the control IC on the main board.

See the test procedure for each cause

Frequently asked questions about F12.5

What does F12.5 mean on a Fisher & Paykel cooktop?
F12.5 means the cooktop's internal Switched Mode Power Supply (SMPS) has not shut down within 10 seconds of receiving a turn-off command. The cooktop monitors this shutdown sequence, and when the power supply remains active past that threshold, it logs F12.5 and halts operation. This is a power supply regulation fault centered on the main PCB power supply board. It requires diagnosis of the power supply circuitry rather than a surface-level fix.
Can I fix F12.5 on my Fisher & Paykel cooktop myself?
Diagnosing F12.5 requires testing the main PCB power supply board, which involves working near mains voltage components. Technicians with experience in electronics diagnosis can inspect for failed capacitors, shorted transistors, or connector faults. However, most homeowners should have a qualified appliance technician handle this repair due to the electrical hazards involved. If a full board replacement is needed, the swap itself is more straightforward once the correct part is confirmed.
Is it safe to use my Fisher & Paykel cooktop while F12.5 is displayed?
No, the cooktop should not be used while F12.5 is active. This error indicates the power supply is not responding correctly to shutdown commands, which represents an abnormal electrical condition. Continued use could risk further damage to the control electronics or create a safety hazard. The cooktop should remain unplugged or isolated at the circuit breaker until the fault is diagnosed and repaired.
Will resetting my Fisher & Paykel cooktop clear the F12.5 error?
A power reset by switching off the cooktop at the circuit breaker and restoring power may temporarily clear the F12.5 code, but it will not resolve the underlying fault. If the power supply board or associated components have failed, the error will return. A reset alone is not a reliable fix and should only be used as part of an initial diagnostic step to assess whether the fault is intermittent or persistent.
How much does it cost to repair a Fisher & Paykel cooktop showing F12.5?
Repair costs depend on what component has failed and local labor rates. If the issue is a wiring or connector fault, costs may be relatively low, typically in the range of a standard service call fee. If the main PCB power supply board requires replacement, parts and labor combined can range from a few hundred dollars up to several hundred depending on the specific model and part availability. Getting a diagnostic assessment before committing to a repair is advisable.

Related Fisher & Paykel cooktop codes

All Fisher & Paykel cooktop codes
View all 22 Fisher & Paykel cooktop codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass