27
Immergas
Flue Gas Overtemperature
Furnace shows 27, burner output limited or boiler stops, often in condensing models
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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
Partially blocked flue, Incorrect flue length or configuration, Fan speed too low, Scaled primary heat exchanger causing high flue temps
How to Fix / Troubleshooting
Safety: Flue gases are hazardous. Only qualified personnel should dismantle or modify the flue system.
User checks:
- 1. Inspect terminal: Ensure the flue terminal is clear and not obstructed.
- 2. Check for signs of overheating: Yellowing or discoloration around the flue outlet may indicate overheating.
Technician actions:
- Measure flue gas temperature and compare to specifications.
- Inspect and clean the primary heat exchanger and flue path.
- Verify fan speed control and replace fan or PCB if necessary.
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Repair Difficulty
Professional Required
5/5
Required Part
Flue Gas Fan Assembly
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