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Hi there, I have done the Gas safe engineer course, and waitng for my badge. It is good to be concern. thanks

I have boiler BIASI 24S, The boiler would not come on , SO i changed the main PCB board. It is working now but the Hot water tempratre would not go more then 35 degree cent. same on Heating, and the boiler will keep going on for few seconds and then off, and then on again and off repeating...