Ferroli
Chronic Pressure Loss
Boiler frequently loses pressure and needs topping up every few days, with no specific error code until pressure becomes very low.
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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 pipework or radiators, Failed expansion vessel, Pressure relief valve passing, Micro-leaks inside boiler casing
How to Fix / Troubleshooting
Safety first: Do not continually top up the system; this introduces fresh oxygen and accelerates corrosion.
- Visual leak check: Inspect all visible radiators, valves, and joints for signs of dampness or staining.
- Check PRV discharge: Look at the external copper discharge pipe while the boiler is running; any dripping indicates the PRV is passing.
- Expansion vessel test (engineer):
- Isolate and drain pressure from the system.
- Measure and recharge the expansion vessel with a pump to the specified pressure (often around 0.8–1.0 bar).
- Replace the vessel if it will not hold charge.
- Leak detection: An engineer may use leak detection fluid or pressure testing to locate hidden leaks.
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Repair Difficulty
Medium
3/5
Required Part
Expansion Vessel
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