E05
Triangle Tube
Fan Speed / Combustion Blower Fault
Boiler shows E05, fan runs but burner does not light
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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 combustion fan (inducer), Loose or damaged fan wiring harness, Obstruction in fan wheel, Faulty fan speed feedback to control board
How to Fix / Troubleshooting
Safety: Disconnect power before working near the fan or removing the combustion cover.
- Step 1 – Listen to the fan: Call for heat and listen. If the fan hums but does not spin, or makes grinding noises, it may be seized or obstructed.
- Step 2 – Inspect fan housing: With power off, remove the fan access cover on the Triangle Tube boiler. Check for debris, broken plastic, or foreign objects in the fan wheel. Spin the wheel by hand; it should turn freely without scraping.
- Step 3 – Check wiring: Verify the multi-pin connector from the fan to the control board is fully seated and not corroded. Inspect wires for damage.
- Step 4 – Reset and test: Reassemble, restore power, and reset the boiler. If E05 returns and the fan does not reach speed, the fan assembly or control board may be defective.
- Professional repair: Replacement of the combustion fan and verification of combustion settings should be done by a licensed technician.
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Repair Difficulty
Hard
4/5
Required Part
Combustion Fan Assembly
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