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Good morning, I have the above boiler roughly two years old. Heating and water both work absolutely fine either on demand or on the timer. However for some reason the blue led on the display doesn't light up at all. You can hear the burners and the correct letter is displayed during operation...

Morning everyone, I was wondering if anyone could give me some advice before i call someone out. I have the above model boiler installed in my terrace, always worked fine with no issues that I can recall. we have just been away for 2 weeks, wasnt on before we went due to weather. When we got...