Bryant
Blower Stuck On
Indoor blower runs continuously even when thermostat is not calling for heat or fan.
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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.
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Possible Causes
Fan set to ON at thermostat, stuck blower relay on control board, shorted G (fan) thermostat wire to R
How to Fix / Troubleshooting
Safety first: Turn off power before removing thermostat or furnace panels.
- Check thermostat fan setting: Ensure the fan mode is set to AUTO, not ON.
- Inspect thermostat wiring: Remove the thermostat from its base. If the blower stops, the thermostat may be commanding fan. If it continues, the issue is at the furnace.
- Check G to R short: At the furnace control board, disconnect the G wire. If the blower stops, there is a short between G and R in the thermostat cable or thermostat.
- Control board relay: If the blower runs even with G disconnected and no call for heat, the blower relay on the Bryant control board is likely stuck closed.
Replacing a control board with a stuck relay should be done with an OEM Bryant board and proper static precautions.
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Repair Difficulty
Medium
3/5
Required Part
Furnace Control Board
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