29
Immergas
Combustion / Flue Recirculation Error
Error 29; unit indicates flue gas recirculation or combustion quality fault.
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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
Incorrect flue installation, Blocked or damaged flue terminal, Fan/venturi contamination, Incorrect gas valve adjustment
How to Fix / Troubleshooting
Safety: Turn off power and gas. Do not operate the heater until the flue system is checked.
- Inspect flue terminal: Ensure the terminal is not too close to windows, corners, or other vents, and that it is free of obstructions.
- Check for recirculation sources: Avoid installing the terminal where exhaust can be drawn back into the intake (e.g., under balconies without clearance).
- Clean fan/venturi: A technician can remove the fan and clean the venturi and sensing points to restore correct air measurement.
- Combustion analysis: Have an authorized Immergas technician perform a combustion test and adjust the gas valve if necessary.
Warning: Combustion faults can lead to carbon monoxide hazards; always involve a qualified professional.
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Repair Difficulty
Professional Required
5/5
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