Heating wont work unless hot water is on

[pollard1]

I have had a look around and cant find an answer.

Just moved into a house and when I turn my HW on and CH on both work (HW also works on its own) but CH on its own doesn't boiler stays off. I believe I only have 1 2 way valve cant find any info on this setup.

Boiler is a Prima F30 and all the components have ACL Lifestyle on them.

I have tried thermostats to full and heating works 100% when HW is on.

Any help would be great.

Thanks

[net]193966/50937_3//media.diynot.com/194000_193966_50937_38013289_thumb.jpg8013289.jpg[/net]

 

[pollard1]

Untitled

• pollard1
• 4 Oct 2012
• 1

 

[seco services]

Looking at that pic your not going to get ch on it's own the way it's plumbed/wired.

 

[pollard1]

Ok Thanks do some houses get plumbed like that then?

 

[seco services]

That's an old idea.
The valve is more likely only connected to the wall stat, The boiler fires from the hw on.

Can be converted to a s plan with another valve, cylinder stat giving you more control over the hw etc.

 

[Armo74]

You can either add another 2 port valve after the tee going into the top of your cylinder coil and a cylinder stat which would convert it to an s plan, or do away with the 2 port and cut the tee going into the top of the cylinder and add a 3 port with cylinder stat which would convert it to a y plan. As already stated it would give you a lot better control over your hot water and heating.