Potterton
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
Leak on heating circuit, Faulty pressure relief valve passing, Failed expansion vessel diaphragm, Micro-leaks in radiators or pipework
How to Fix / Troubleshooting
Safety first: Do not over-pressurise the system above the red zone on the gauge.
User checks:
- Inspect visible pipework and radiators for damp patches or green/white staining.
- Check the pressure relief valve discharge pipe outside for drips when the boiler is running.
Engineer checks:
- Test the expansion vessel pre-charge and recharge or replace if failed.
- Replace a passing pressure relief valve.
- Use leak detection methods (e.g., pressure testing, dye) to locate hidden leaks.
Persistent pressure loss must be investigated; repeated topping up accelerates corrosion.
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Repair Difficulty
Medium
3/5
Required Part
Expansion Vessel
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