LED flashes code 41; blower may run at incorrect speed or airflow seems low/high.
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
How to Fix / Troubleshooting
Safety: Turn off power before working on the blower. Capacitors can hold a charge; discharge properly before handling.
Steps:
- Inspect blower wiring: Remove blower door and check the multi-pin connector from the ECM motor or individual speed taps on a PSC motor. Ensure all are firmly seated.
- Check capacitor (PSC motors): If your Comfortmaker furnace uses a PSC blower, test the run capacitor with a multimeter. Replace if more than 10% below rated µF.
- Check for obstructions: Inspect the blower wheel for debris or heavy dust buildup. Clean carefully if needed.
- Listen for motor noise: Restore power and call for heat or fan. Listen for humming, grinding, or intermittent starting, which indicate motor failure.
When to call a technician: ECM motors and control boards require specialized testing. If code 41 persists, professional diagnosis and likely motor or board replacement are needed.