Fondital
Chronic Pressure Loss
Boiler frequently loses pressure and needs topping up every few days
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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
Small leak in heating circuit, Failed expansion vessel on Fondital boiler, Weeping safety valve, Micro-leak in primary heat exchanger
How to Fix / Troubleshooting
Safety: Do not repeatedly overfill the system above 2 bar. This can damage components.
User checks:
- Visual inspection: Look for damp patches under radiators, valves, and around the boiler.
- Discharge pipe: Check outside safety discharge pipe for intermittent dripping when the boiler is hot.
- Record pressure: Note pressure when cold and when hot to report to the technician.
Technician actions:
- Test and recharge or replace the expansion vessel.
- Replace a leaking safety valve.
- Pressure test the heating circuit and inspect for hidden leaks.
- Check the primary heat exchanger for internal leaks into the combustion chamber.
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Repair Difficulty
Hard
4/5
Required Part
Expansion Vessel
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