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Thanks Moggett I have just tried loosening the drain valve by the boiler, and leting a litre or so of water out. The header tank water level fell at the same time, s I assume this means the feed pipe is clear.

Thanks Buck He was sent by British Gas, so I hope he was qualified.... He said he would replace the valve in case the original replacement was opening too quickly. I can't find any reference to air being sucked into the radiator when bleeding it, or am I missing something. It is a...

I had the 3 way valve replaced by a plumber, and every time the heating or water fires up the pipes vibrate, like water hammer (ie for about 1 second). The plumber came back, replaced the valve again, but it is still bad. I have tried to bleed the system, in case there is an airlock. If I...

Traced the "live" from the zone valve, connected to boiler live, and now works perfectly! Thank you for your help.

I'll tak a close look tomorrow. Thanks for your help.

I have not found a zone valve, but there is a room stat in the living room. There is also a stat on the cylinder. Many thanks for your help.

OK thanks, so at least I know now where my problem is! (I am assuming the flexible cable in the wall box is the boiler - all of the others are solid copper). Now all I have to do is identify which of the wires is from the valve. This is an existing system, all I have replced is the...

Hi. I have replced a Danfoss Set 5 programmer with a Danfoss FP715. I followed (I thought) the wiring conversions with the instructions, but as soon as I turn on the power, the boiler fires up, even if the programmer is set to off. The boiler turns off after about 5 minutes (I assume when the...