E17
A.O. Smith
Fan Speed / Combustion Air Fault
A.O. Smith heater shows E17; unit may not modulate correctly or may shut down
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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 fan speed sensor, Obstructed blower wheel, Incorrect vent length causing airflow issues, Control board fan drive fault
How to Fix / Troubleshooting
Safety: Turn off power and gas before opening the blower compartment.
- 1. Inspect blower wheel: Remove the blower cover and check for dust buildup, debris, or damage to the wheel. Clean with a soft brush and vacuum.
- 2. Check venting: Verify vent length and configuration match A.O. Smith installation guidelines. Excessive length or elbows can cause airflow faults.
- 3. Fan sensor connection: Ensure the fan speed sensor or Hall-effect sensor connector is firmly attached to the blower and control board.
- 4. Replace blower: If the fan does not reach commanded speed or the sensor is integrated into the blower, replace the entire blower assembly.
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Repair Difficulty
Hard
4/5
Required Part
Draft Inducer Blower Assembly
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