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You just pick it up mate as you go along I did a few manufacturers courses you just get to know the faults on certain boilers, it's often a process of elimination the flow charts in the manual along with the fault codes , it's worth learning how to use a multimeter property aswell , you tube is also useful if you're struggling and as a learning aid . Regards KopI was going to say Newcastle, but didn’t want to look a tit and it be like London
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Where did you find best for experience mate?