Your boiler has shut down because it keeps losing its flame, possibly due to a problem with the internal sensor that detects it or an unstable electricity supply.

Temporary flame loss Shutdown due to the power supply voltage being too low ELECTRODE PROBLEM Check the electrode electrical connections Check the condition of the electrode GAS SUPPLY Check the gas inlet pressure Check the gas valve calibration FLUE GAS EXHAUST PIPE Check the air intake and flue gas exhaust terminal Check the power supply voltage