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I have a Potterton Powermax 155x. For the last 2 days the hot water and central heating haven't been working. The power light is on, but the system doesn't fire up and goes to lock-out about 30 seconds after I turn it on. There is a pressure gauge on the outside of the boiler, but we have...

We have had 2 boiler engineers out to fix our Potterton Puma 80e which has been working intermittently. It is still failing to work sometimes and having taken the cover off and had a quick look, we have realised that the cause of our problems is a loose wire on the PCB (if you move the wires...