A05
Immergas
Fan / Air Pressure Lockout
Boiler displays A05, fan or air pressure fault, boiler does not ignite.
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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
Fan not running, Blocked air pressure tubes, Faulty air pressure switch, Blocked flue or air intake
How to Fix / Troubleshooting
Safety: Isolate power before accessing internal components. Flue work must be done by a qualified engineer.
- Check flue terminal: Remove any visible obstructions from the terminal.
- Inspect fan: Confirm that the fan runs during ignition attempts. If not, check wiring and replace the fan if necessary.
- Clean pressure tubes: Remove and clean the silicone tubes and check the air pressure switch for correct operation. Replace if defective.
- Reset and test: After repairs, reset the boiler and confirm that A05 does not reoccur.
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Repair Difficulty
Hard
4/5
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