E08
Dettson
Combustion Fan / Blower Fault
Boiler shows E08 and fan does not start during a call for heat
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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 Dettson combustion fan motor, Seized blower wheel, Faulty fan relay on control board, Loose fan wiring harness
How to Fix / Troubleshooting
Safety: Disconnect power before working on the fan or control board. Do not bypass safety circuits.
- Listen for fan operation: During a call for heat, you should normally hear the combustion fan start. If it is silent, proceed with checks.
- Inspect wiring: Remove the front panel and locate the combustion fan assembly. Check the plug and wiring harness for secure connections and signs of overheating or damage.
- Check for obstructions: Spin the blower wheel gently by hand (with power OFF). It should rotate freely without scraping. Remove any debris.
- Electrical tests (technician): A professional should verify voltage at the fan terminals when the boiler calls for fan operation. If voltage is present but the fan does not run, replace the Dettson combustion fan. If no voltage is present, the control board or relay may be faulty.
- Do not operate without fan: Never attempt to run the boiler with a non-functioning fan; this can cause dangerous combustion conditions.
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Repair Difficulty
Hard
4/5
Required Part
Dettson combustion fan assembly
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