E08
Alpha
Fan Speed / Hall Sensor Error
Display shows E08; water heater does not start and fan may not run.
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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 blower speed sensor, Defective combustion blower motor, Loose fan connector, Faulty control board fan driver
How to Fix / Troubleshooting
Safety: Turn OFF power and gas before servicing.
- Access blower: Remove the front cover to reach the Alpha combustion blower assembly.
- Inspect connector: Check the multi-pin connector from the blower to the control board. Ensure it is fully seated and free of corrosion.
- Check for obstruction: Spin the blower wheel by hand to confirm it is not jammed by debris.
- Electrical test: With power restored and a call for hot water, carefully measure voltage at the blower connector (only if you are trained and equipped). If the board sends power but the blower does not run, the blower assembly is likely faulty.
Because this involves live electrical testing and combustion air, blower or board replacement should be handled by an Alpha-qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Combustion Blower Assembly
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