BoilerFaultCodes L1 Your boiler has stopped working because it has detected it is getting too hot too quickly or there is not enough water moving through the system.
Your boiler has stopped working because it has detected it is getting too hot too quickly or there is not enough water moving through the system.
What to check first
- Check that your system pressure is between 1 and 1.5 bar on the pressure gauge
- Ensure all radiator valves are fully open to allow water to flow
- Check for any visible leaks around the boiler and pipework
- Press the reset button to see if the fault clears
Parts commonly replaced
- Circulating pump
- Thermistor (NTC sensor)
- Diverter valve