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Hi Andy I assume you found out what the issue was? I have the same issue after doing my install today. I am baffled and can only assume there is an issue with the cable as the button works fine on my other shower.. Let me know what your solution was Cheers Matt

The valve was bundled with the unvented cylinder and was an orkli I replaced the head with a siemens czv2 which was identical and was listed as a suitable replacement As i mentioned before it was working perfectly for a short while... this is what is so frustrating.

Don't think this is the problem because if you move the valve to manual the water heats up fine indicating the valve must be open. I think I have been unfortunate enough to get another fault on the head and will have to replace it again..but I could be wrong.

Thanks for the tip, but the pin rotates freely I can turn it with my fingers. The confusion is that by replacing the head everything was fine, but only for 4 hours or so. Seem unlikely that a new replacement would develop a fault in this timescale... although anything is possible I suppose!

I did check the cylinder stat was working. Voltage was passing through when calling for heat and when up to temp was swiching off. So think cylinder stat is ok. Thanks for the suggestion though.

I have a problem with the 2 port valve on my HW system. The HW stopped working so I moved the valve to manual and it was working. After a while the hw was on continuously even if the programmer was turned off. I assumed the valve was faulty so replaced the head with a new one today. All...