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My Baxi Combi appears to be over-pressurising and the overflow pipe that leads to the outside has a constant drip, drip, drip; this dripping gets worse when the boiler is on and the hot water is being pumped round the CH circuit or the hot water tap is on. It has been suggested to me that...

I knew that the boiler was leaking and could hear a gentle hiss. I eventually managed to find a small jet of water spraying out of the plate heat exchanger onto the wall that the boiler is mounted on. Whan the pressure in the central heating circuit falls below 0.5 bar the leak sems to stop...

When the boiler is cold (if the CH has not been on in the last half hour or so) when I turn the hot tap on I do not get hot water. This means that I have to turn the CH on for a minute or two for things to warm up before trying the hot water again. A further problem is that if I turn the hot...