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Just a little update on this old thread, problem now solved! I decided to cut the return pipe from the HW cylinder so I could plug a hose pipe on that particular section to flush it through - on cutting the pipe I found it to be completely blocked with sludge - thus not letting any hot water...

Thanks guys, I now know it is air in the system, it was just a coincedence that the air started from the gate valve making it seem like the gate valve was at fault by not passing the hot water through. I have tried bleeding all the radiators and the bleed valve near the gate valve on the...

Thank guys, I will try you suggestions on the weekend and let you knwo how I get on!

Expansion tank is full of water and ballcock working, just went up there and checked. Can I just confirm that if the valve was working properly it should let the hot water pass and go into the hot water tank? If so then I guess the valve is still faulty and it either was not fitted...

What does the manual arm at the bottom of the valve do, is this supposed to manualy open the valve? I tried moving it but there is no resistance in it and it does not seem to make any difference.

The valve is a honeywell V4043H1056 and is brand new, I have looked the part number up on the internet and it is a 22mm 2 port zone valve 240V. It was fitted by a plumber just before we moved in as he apparently thought the valve was the problem and had assumed everything was working. The...

I checked the thermostat on the cylinder - it was set too low for the boiler to come on, the boiler now switches on fine so it's not the timer. There is a valve next to the hot water tank that has recently been replaced, I can hear this opening and closing but it does not seem to pass any...

I know this must be a common problem but I searched the forum and could not find someone with the same issues! I have recently moved into a new house and the hot water has not worked since moving in, it will only work if I put the immersion heater on, the CH works fine. I had a little...