0.5bar Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
What to check first
- Locate the filling loop, which is usually a metal braided hose underneath the boiler.
- Open the two valves on the filling loop to allow cold mains water into the system.
- Watch the pressure gauge on the front of the boiler until it reaches 1.5 bar, then firmly close both valves.
Parts commonly replaced
- Filling loop
- Pressure relief valve
- Expansion vessel