Hi
We're building an extension and have had a new boiler fitted but getting the heating system back to normal is posing a few problems. The system is a Y plan one with Honeywell contols bits and the new boiler is a Rehema Avanta condensing one. For some reason the hot water is always on (ie it takes no notice of the hot water part of the timer) so we turn the cylinder stat up and down to control the hot water. The three way valve was clicking and has been replaced.
Unfortunately, the heating will not work unless the hot water is requesting heat. So to get heat to the rads in the morning we go and turn cylinder stat up. So i was thinking that the wiring must be wrong and trying to get the plumber to look at that (he is scratching his head a bit).
But this evening i discovered that I could also get the heating to work by turn the cylinder stat down, well past the hot-water off point.
So, in summary, the heating works if i turn the water stat up (by virtue of the water firing up the boiler and pump and the heating being on with room stat requesting heat) and if i turn the water stat right down (by virtue of the three way valve making the right connections). But it doesn't work if i only turn the water stat down to just off. Does this mean the three way valve is not working correctly?
Thanks v. much for reading and for any advice.
SullyTheGoldfish
We're building an extension and have had a new boiler fitted but getting the heating system back to normal is posing a few problems. The system is a Y plan one with Honeywell contols bits and the new boiler is a Rehema Avanta condensing one. For some reason the hot water is always on (ie it takes no notice of the hot water part of the timer) so we turn the cylinder stat up and down to control the hot water. The three way valve was clicking and has been replaced.
Unfortunately, the heating will not work unless the hot water is requesting heat. So to get heat to the rads in the morning we go and turn cylinder stat up. So i was thinking that the wiring must be wrong and trying to get the plumber to look at that (he is scratching his head a bit).
But this evening i discovered that I could also get the heating to work by turn the cylinder stat down, well past the hot-water off point.
So, in summary, the heating works if i turn the water stat up (by virtue of the water firing up the boiler and pump and the heating being on with room stat requesting heat) and if i turn the water stat right down (by virtue of the three way valve making the right connections). But it doesn't work if i only turn the water stat down to just off. Does this mean the three way valve is not working correctly?
Thanks v. much for reading and for any advice.
SullyTheGoldfish