Luxaire Continuous Fan Operation

Blower runs continuously even when there is no call for heat or cool.

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

Thermostat fan set to ON, Stuck blower relay on control board, Limit switch stuck closed, Miswired thermostat

Safety: Blower-only operation is generally safe but indicates a control issue.

Steps to check:

Thermostat fan setting: Ensure the fan is set to AUTO, not ON.
Power cycle: Turn off the furnace breaker for 1 minute, then restore power to reset the control board.
Thermostat wiring: Verify that G (fan) wire is not shorted to R at the thermostat or furnace.

If the blower still runs constantly with G disconnected at the control board, the blower relay or board is likely stuck and needs replacement.

Medium 3/5

Integrated Furnace Control Board

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