Well it is to me, but what have I missed
Sorry abour that but frustration got in the way of mannersYou've also missed a please and thank you.
Id already tried that one by powering boiler from completely different circuit but its still the sameThe Immersun thing and the boiler are on the same fused spur.
The wireing from the inersun goes to the immersion heater alone, there is no physical connection between the immersion heater and boiler ciruitit is not wired correctly as @Dan Robinson already told you, when you switched off the isolator for the immersun the zone valve from your boiler also closed it shouldnt
I think you have misread my reply as there is nowhere in there that disagrees with you, I was adding more info that the boiler would have also been firing had i had not turned it off.when the Zone valve is open the manual fill lever has no resistance and feels like it is doing nothing, when it is closed the lever offers resistance when you try to move it, I heard it closing on your video , turn off the isolator again and check if you dont believe me
Thanks for the info. I have gone part way to findind the problem but dont know why.It's an interesting one... You'd need to trace the brown wire from the zone valve back through the cylinder stat and into the "wherever". The cylinder stat is picking up 230V from somewhere (it has a permanent live in it which can flummox some installers).
Whilst possibly not a complicated fault to find, you need to know your way around a multimeter.
Also - those cables are not secure in the wiring box of the cylinder - those little holes at the bottom should have clamps in them.
I have now dissconected the solar from the immersion, connected it to the mains and everything is back to normal.
I will have to get the solar Guys back to see what the issue is as powering the mains with solar has caused the problem
output voltage from the switch to immersion heater is DC
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