F32 displayed, fan speed unstable or not detected correctly

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Failed Hall sensor in Protherm fan motor, Broken tachometer wire, Fan wheel obstructed, Faulty fan control circuit on PCB

Safety first: Disconnect power.

Step 1 – Inspect fan: Remove the combustion fan cover and check for debris or damage to the fan wheel.
Step 2 – Check wiring: Verify that the multi‑pin connector between the fan and PCB is secure and undamaged.
Step 3 – Replace fan assembly: If the fan runs but speed feedback is incorrect, the internal sensor is likely faulty. Replace the complete Protherm fan assembly.

Hard 4/5

Combustion Fan Assembly

Check Price on Amazon

We may earn a commission from links on this page.