BoilerFaultCodes Loss of system water pressure Your boiler has lost the water pressure it needs to circulate heat, likely because there is a small leak somewhere in your radiator pipes or the boiler itself.
Your boiler has lost the water pressure it needs to circulate heat, likely because there is a small leak somewhere in your radiator pipes or the boiler itself.
What to check first
- Locate the filling loop, which is a silver braided hose with a valve positioned underneath the boiler.
- Open the valve(s) to allow a small amount of cold water into the system until the pressure gauge needle sits back in the green zone, usually between 1.0 and 1.5 bar.
- Close the valve(s) tightly to stop the flow and ensure the pressure remains steady.
Parts commonly replaced
- Pressure relief valve
- Expansion vessel
- Filling loop