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Tony & Seco, Latest update because I know you are dying to hear :D When I went up to check the thermostatic valve, which by the way is not jammed down, I heard a hissing sound coming from the valve indicated below. The valve had a screw in the face which said loosen to adjust,I loosened...

Tony, welcome back, when you are talking about the thermostatic head do you mean this one. If it is as you describe jammed down what would you expect teh pipe going into the cylinder to be Hot or Cold, because it is very hot. Let me know and I am willing to try anything. Thank you for...

I ahve tried to indicate the valve I think you mean. Where you think I could try loosening, and where the pipe is cold to.

Firstly thank you for staying with this one you have been superb. Yes the bottom return is hot after where i indicated with a series of lines. The bypass at the bottom of the Valve ( Thermostatic) is hot. There is a valve with a red end that you can see at the right of the picture. I...

The programmer is at HW only. the hot pipe is indicated on the picture below. I have not had HW for 5 days. I changed the diverter valve yesterdayWhen you say slacken the nut on the cylinder base return do you mean at point of entry on the cylinder?

I think we are getting closer to the root cause. The bottom pipe out of the cylinder is cold bu only for about 18 inches, it then comes to a T junction, soldered junction, which goes off to a red "expansion tank???" and then continues on its run. It also goes off to another valve. I have...

In the first picture both sides of the Thermostatic valve are very hot. The bottom pipe runs away for some 5 meteres before dropping down, and is cold. The thermostatic valve is set at 12, the highest setting. The second picture shows what I think is the vent valve .

Not good pictures but here goes: I didn't drain the system because I only changed the head.[/img][/url]

I have a very hot pipe before the thermostat, a very hot pipe into the cylinder but a cold pipe below that coming out. I'm with you on this one it does sound like an air blockage somewhere. Is there anything else I can try?

Just come down from the loft. The cylinder is in the loft and the vent I was describing is just above the thermostat control on the feed into the cylinder. The name on thew vent was Flameno varivent. I unscrewed the red dust cap and loosened the vent I did get some air out, not much. I have...

Once again many thanks. I'm just off to pay a visit to the loft. If you are still around when I get down I will send an update. Wish me luck

Seco thanks for the continuing help. In summary: 1. Make sure the timer is not set to HW 2. This should stop the pump (If the timer is set for CH does this cause the pump to kick in?) 3. try to vent the cylinder again. if no air out try pump on speed 3. It souns as though I should...

I didn't get any air at all. The valve has vent written on it with a manufacturers name. I assume this is the right vent. The pump has three setting I am on the middle setting. The pump is a Wilo Gold 60

Yes if it looks like a gun metal grey valve with a red dust cap. I have removed the dust cap and opened the valve slightly I had a trickle of hot water.

When calling for HW the boiler and pump appear to be working. The pipe into the cylinder is hot, the pipe out of the cylinder is cold. I also have a pipe out of the top of the cylinder to my shower that is also cold.

Tony, thank you for response in which it seems you repeated your questions from your first reply. I thought I had answered them. 1. I have told you everything, Cross my Heart. 2. I did pay them, cross my heart. 3. The reason he didn't fit the part, as explained is that he was stuck on...

Seco, thanks for your response. So having confirmed that the diverter valve appears to be working OK what is the next line of attack to try and resolve this. Again thanks for taking the time to reply.

Again sorry I didn't want to bore the board with my tale of woe, but here goes. The engineer visited, I have paid for this call, and diagnosed a faulty diverter valve. He was scheduled to come and fit the valve yesterday. He called me to say that the supplier they use did not have the part...

Sorry for being such a dimwit, but my limited knowledge may be damaging my explanation. I only have one diverter valve. When the electronic timer is set for HW only I get resistance on the manual arm. When the timer is set for CH and HW I do not get any resistance. When the timer is set...