Your boiler is struggling to keep its flame lit and has shut down for safety after failing to stay ignited five times in a row.

Technical description

Flame lost signal lost 5 times in 4 minutes. Flame sensing error. Failing gas pressures. Fan fault. Flue blockage. Check flame detection lead between sensor and ignition control board. Check the gas supply, does pressure fall when burner fires? Check that flue system is not blocked.