Fisher & Paykel Cooktop Error Code F12.11

Error code F12.11 on a Fisher & Paykel cooktop indicates a burners-up signal fault. The burner board has detected a voltage on the burners-up signal line that does not match the combination of burners that the master PCB has reported as raised via the communications bus. This mismatch persists for 25 seconds before the fault is triggered. The cooktop uses a network where the master PCB coordinates burner position states and communicates them to the burner boards. When the physical voltage signal and the communicated state disagree for that duration, the control system flags it as a fault.

The burners-up signal is a dedicated electrical line that reflects the physical position of the burner assemblies. The master PCB sends position data through the comms network, and the burner board independently reads a voltage from the signal line. If a wiring fault, poor connector, or damaged board causes these two inputs to conflict, the system cannot confirm safe burner positioning and triggers F12.11. The most direct starting point is inspecting the wiring harness and connectors between the master PCB and the burner boards for damage, corrosion, or loose pins.

In some cases, the fault originates in the burner board itself if its analog input circuitry is misreading the signal voltage, or in the master PCB if it is transmitting incorrect position data. A failed or intermittently failing burner board can produce a phantom voltage reading that conflicts with the comms data. Systematic diagnosis should isolate the wiring first, then evaluate the boards individually.