Heating problems
Boiler pressure keeps dropping: causes and what to do
If you top up the pressure every few days, there is a cause: a leak, the expansion vessel or the safety valve. Constant topping up with fresh water speeds up corrosion – worth diagnosing.
Answer in 1 working day
How to recognise it
What you see – and what it usually means
Pressure drops after bleedingnormal once – restore it as the boiler manual says
Drops constantly, no wet spotsexpansion vessel or safety valve
Visible drips or stainsa leaking joint or radiator
Likely causes and the right service
You can safely check
- Check the pressure gauge (usually 1–2 bar for a cold system – see the manual).
- Check that radiator thermostatic heads and manifold valves are open.
- Note the error code and photograph the rating plate.
We do not give repair instructions: gas, electrical and pressurised systems are serviced by qualified specialists.
Smell gas? Do not switch anything electrical, close the gas valve if safe, open windows, leave and call 112.
Fault reporting
Report it in a minute – follow the status online
Choose the system and symptoms, add the error code and a photo. You get a number, a status page and a direct line to the technician. No heating in winter or a leak gets top priority.
- 1System
- 2Symptoms and code
- 3Photo
- 4Contact
3D
See where the problem sits
The 3D house shows the heat source, pump group, manifolds and radiators with water flows – it is easier to understand what the technician will check.
Diagnostics3D · System flushingHeating system with flows
See how your home will work – then we build it
Create your home profile in 2 minutes. The engineer gets your data, calculations and 3D configuration.