Westinghouse Blower off-delay or stuck fan relay

Furnace blower continues to run for a very long time after burners shut off, blowing cool air.

Safety Warning

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

Blower off-delay set too long on IFC, Stuck fan relay on control board, Thermostat fan set to ON, High limit recently tripped and blower is cooling heat exchanger

How to Fix / Troubleshooting

Steps:

Check thermostat fan setting; set to AUTO instead of ON.
Observe whether the blower eventually shuts off; if it runs indefinitely, the fan relay on the IFC may be stuck.
Consult the Westinghouse installation manual to locate blower off-delay settings (dip switches or programming) and adjust to a normal value (e.g., 90–120 seconds).
If settings are correct and the blower still runs constantly, the IFC likely needs replacement.

Repair Difficulty

Medium 3/5

Required Part

Integrated Furnace Control Board

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