Fondital
Reduced Efficiency / Combustion or Scaling Issue
Boiler runs but gas consumption seems unusually high compared to previous seasons
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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
Dirty burner or heat exchanger on Fondital boiler, Incorrect gas valve adjustment, Faulty modulation control, Limescale in DHW and primary circuits
How to Fix / Troubleshooting
Safety: None immediate, but high gas use increases costs and emissions.
User checks:
- Thermostat settings: Ensure set temperatures and schedules have not been increased.
- Insulation: Check for obvious changes in the property (open windows, damaged insulation).
Technician actions:
- Service the boiler: clean the burner, primary heat exchanger, and check the condensate path.
- Perform a flue gas analysis and adjust the gas valve.
- Check modulation control from the Fondital PCB.
- Descale DHW and primary circuits if limescale is present.
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Repair Difficulty
Medium
3/5
Required Part
Primary Heat Exchanger
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