CODE 41
Fraser-Johnston
Blower Motor Fault (ECM or PSC)
LED flashes four short and one long blink; blower runs at incorrect speed or not at all.
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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
Failed ECM module on blower motor, Open blower winding, Faulty blower relay on IFC board, Loose blower harness
How to Fix / Troubleshooting
Safety first: Turn off power before accessing blower.
- Inspect blower harness: Ensure the multi‑pin connector between the blower motor and IFC board is fully seated and free of corrosion.
- Check for overheating: Touch the blower motor housing (carefully). Excessive heat may indicate internal failure.
- Reset power: Cycle power to the furnace to reset ECM electronics. If the fault returns, the motor or control board may be defective.
- Professional testing: ECM motors require specialized testing. A technician can determine whether to replace the motor assembly or the IFC board.
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Repair Difficulty
Hard
4/5
Required Part
ECM Blower Motor
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