Central heating ok but no hot water. Zone valve problem?

[CooperFBI]

Hi all,

My central heating system is working fine, but I've got not hot water running.

Previously, manually activating the Zone valve closest to the tank (Honeywell V4043) let the water flow fine.
It had got very jammed and I had cleaned it up with WD40 and a drop of oil, which freed it up and had everything working fine.
It jammed up again and having cleaned again it stopped delivering water even on manual activation - it now seems that the hot water will only work if the boiler is firing up the whole central heating system (by setting the main room thermostat to 21 degrees, something I don't want to have to do all the time!)

The system has always been very slow at getting hot water. Is this a problem or just a foible of this type of system?

I was looking at replacing the head unit of the zone valve but think the problem might run further than that.

Here's a picture of the set up at the tank end.

Untitled

• CooperFBI
• 25 Apr 2008
• 1

My boiler is a Potterton Kingfisher MF

Any help would be greatly appreciated.

Thanks.[/img]

 

[totalshell]

change the motor/ head looks like acess isnt that bad......

 

[Agile]

To DIA, I would rate that as a very bad installation because the pipe layout has totally ignored maintenance access.

Particularly for the pump!

Tony

 

[larrytheleak]

cooper fbi i agree with totalshell & agile but i noticed from photo cylinder stat is set too low on cylinder should be just above center point

 

[seco services]

1/3 of the way up not down.

 

[CooperFBI]

Thanks for all the feedback.

Yes, it looks like its a bit of a bodged install, with probably a number of factors causing my problems. I'll install a new head for the valve and will move the thermostat higher up the tank (would have missed that one, so big thanks).