Furnace shows F2, fan may run continuously or not at all

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

Defective fan motor, Faulty fan speed sensor (tachometer), Loose fan connector on PCB

Safety first: Isolate power and gas. The fan is part of the sealed combustion system.

Access the combustion fan and inspect the wiring harness and plug for secure connection.
Check for signs of water ingress or corrosion around the fan connector.
Spin the fan by hand to ensure it is not seized or obstructed.
Restore power and observe whether the fan starts and reaches speed. If it hums but does not spin, the motor is likely faulty.
Replacement of the fan assembly should be carried out by a certified technician, as it affects combustion safety.

Hard 4/5

ATAG combustion fan

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