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Thanks. Questions to Ollski and Poxi please Ollski....... I did like you suggested, and the overflow pipe outside is dripping, so does this mean there is a leak in the system? Or do you think changing the pressure relief valve may solve the problem? Poxi....... I took out the expansion...

Thanks to all. Very strange. I switched the boiler on after it had been off for a while, And it didn't lock out, but instead the pressure kept playing up. Rising and then dropping then rising again. so could this indicate that there is no leak but perhaps a different problem ? Please help...

Thank you Tony and Corgigazza for prompt reply. I thought this was not a DIY ... what a shame !! I'll probably have to call Baxi out .. Any ideas how much it would cost ? Sorry but I'm very skinned at the moment !! If there is a leak ... would they be able to locate it and fix it ? what about...

Can anyone help please please? I have a 3 year old potterton powermax H.E 115 condensing boiler. The pressure falls down every day and the control panel displays p0.5 or p0.9 so I bring it up to the right one. However lately the system locks out and the panel displays A 01 error so I reset it...