E08
Attack
Fan Motor / Fan Speed Control Fault
Boiler locks out with E08; fan may not start or runs erratically.
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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 motor on Attack combustion air fan, Blocked fan impeller, Faulty fan speed feedback (Hall sensor or tachometer), Defective main control PCB fan driver
How to Fix / Troubleshooting
Safety: Isolate electrical power. Do not run the boiler with the casing removed.
Steps:
- Visual check: Remove the front cover and inspect the fan assembly. Look for debris, dust buildup, or signs of overheating.
- Spin test: With power off, gently rotate the fan impeller by hand. It should move freely without grinding. If stiff or seized, the fan must be replaced.
- Check wiring: Ensure the multi‑pin connector from the fan to the PCB is fully seated and not burnt.
- Restart test: Reassemble the casing, restore power, and call for heat. Listen for the fan starting. If it hums or fails to start, do not continue to reset.
Professional repair: Fan replacement and PCB diagnostics should be performed by an Attack‑qualified technician due to combustion safety implications.
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Repair Difficulty
Hard
4/5
Required Part
Combustion Fan Assembly
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