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Left and right photo is coil feed and are hot, the coil outlet( not shown) is cold

This whole pipe gets hot

This is where it gets hot

Don't think so, if there is,it's been placed where no one can see or operate it, unfortunately that is not as ridiculous as it sounds. think I need someone to actually see it, as I am not that good at explaining it all. Thanks for your persistence!

There is one of these that its pipe goes back to loft, the other end goes under floorboards, another one seems to come off pipe from top of cylinder, I shut and opened that one,it was already hot both sides,(immersion has been on)

The upper pipe is getting hot all the way to where it enters the cylinder,well past the Tapstat which has had the head removed completely,the pin is extended about 5mm, the pipe enters on the opposite side of the cylinder which would suggest it's clear up to that point. I think I will have to...

The auto release thing was fitted by the plumber along with he stop cock,it is a very old system,we have several redundant pipes that were disconnected and just left in situ, we have a 3rd tank (empty)in the loft that suffered the same fate. A Rayburn also existed and heated water. None of this...

Hi John, moved the pin with pliers, seems to be fully out, the plumber checked the header tank,and fitted a stop cock up there apparently for some reason. When you talk about the compression nut,do you mean where the return pipe connects to the cylinder? If I get brave enough lol, I think I...

My bypass valve is just on and off, as stated I opened it check flow in return pipe by bypassing the coil, the return pipe got hot all the way back to boiler. The bypass valve has always been shut since we have experienced this wonderful system (20 years). Unfortunately it seems what should be...

The tapstat looks just like a radiator valve, hot water seems to be present on both sides of it (by touch), I have loosened it so no pressure on the pin. The bypass valve is either open or shut manually, I opened it to check hot water return pipe right back to the boiler which seemed to prove...

Yes the hot water must be on for the central heating, I couldn't understand how one valve did all the work on its own. As stated later never seen another one. And it has worked for around 20 years, since we moved here, So who knows! Many thanks for your advice

Unfortunately the pipework defies logic, never seen another valve,but that doesn't mean anything! The "hot" pipe and the return disappear under the floorboards . At the moment we get heating and use the immersion for water, not ideal, but it will have to do for now. The "system" was put in by a...

It's on a larger 22mm pipe that I now assume goes to the CH and the coil, the system allows HW only or HW and central heating. Can't have central heating alone.

There is a controller/programmer that we switch the HW and CH on with. The usual way we control the water temperature is by the boiler thermostat. We have to have both HW and CH on for the CH to work. I think once the hot water has reached the inlet of the tank coil(and can't go further) the...

Thought this might help !

I have just removed the cover of the motorised valve to see if the motor works, it definitely is not. When the valve is held open manually, or to be accurate, (it doesn't seem to matter) the micro switch is making a connection as the boiler will fire up. I think that a new motor/head will be...

Thank you, I can make water leaks just by looking at the pipes,bit of a coward I know. Might try it if I get some bravery!

Thanks,which end? The hot feed or return? Assume you're thinking air lock?

I will try closing all the rads,thanks for advice, think a new cylinder might be cheaper in the long run.The thermostat on the cylinder is wide open, there is a cistern for it in the loft,not sure where the vent pipe comes off, but the plumber did mention it The valve is the top one,2 port...

Thanks for replying, you are correct that I cannot have central heating without hot water being on. There is very little of the pipework to be photographed, two 22mm pipes next to each other, one has the valve on it. The plumber has said there will be a T joint (somewhere under the upstairs...