With a very few exceptions I would never charge if I could not diagnose a boiler fault. But so far it has never arisen that I could not diagnose a fault. Two did take three hours though but there were an extreme exception and was primarily because I did not use the correct testing method. That will never happen again though. Hindsight is valuable!
The only possible exceptions might be with some intermittent fault which rarely presents itself.
Tony
The only possible exceptions might be with some intermittent fault which rarely presents itself.
Tony
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