Gibson Blower On-Delay Control Problem

Furnace ignites but blower comes on very late, blowing very hot air and sometimes tripping limit

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

Incorrect blower delay setting on Gibson control board, Faulty fan timer relay, Sticking blower motor, Miswired blower speed taps

Safety first: Turn off power before adjusting control board settings or blower wiring.

Steps to check:

Control board settings: Some Gibson boards have DIP switches or jumpers for blower on-delay. Verify they are set according to the installation manual.
Blower operation: Confirm the blower starts smoothly when called. If it hesitates or hums before starting, the motor or capacitor may be failing.
Limit trips: If the high limit is tripping due to delayed blower, a technician should adjust blower timing and verify motor health.

Hard 4/5

Fan Control Board

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