F1 Your boiler has stopped working because the amount of water circulating inside the system has dropped below the required level.
Your boiler has stopped working because the amount of water circulating inside the system has dropped below the required level.
What to check first
- Locate the filling loop, which is usually a flexible silver hose with one or two valves underneath the boiler.
- Gradually open the valve(s) to allow mains water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.
- Close the valve(s) tightly and check that the fault code has cleared.
Parts commonly replaced
- Filling loop
- Pressure gauge
- Pressure relief valve