Radiators come on when HW is switched on

[mlance]

Hi,

Ive recently moved into a house that has the following;

Potterton Suprima 50 boiler
Potterton EP2002 control box
Hot water tank on the landing
Cold water tank (i guess in the loft)
Thermostat in the hall

I have noticed that when I put the HW on the radiators start to warm. I had a combi in the previous house so my knowledge of this system is limited but surely this isnt right?

I read on the plumb centre website that the EP2002 model cannot do HW and CH independently, but the upgrade EP6002 can?

Anyone heard of this? Or is it the diverted valve which I've read about?

Any help would be grately appreciated.

Thank you.

 

[45yearsagasman]

Does this look familiar? View media item 38425

 

[mlance]

Thanks for the reply, is that the diverter valve? Are you saying that's the most likely culprit. Is it located next to the hot water tank, and if so how do I know its stuck between hot water and heating? Thanks.

 

[Armo74]

Yes, the valve should be in the airing cupboard next to your hot water cylinder. Depending on what model it is you need to isolate the electricity supply and remove the silver box if it's like the one in the picture. When the box is removed it should reveal a little spindle you should be able to rotate it slightly if you can't it is stuck in mid-position and it will probably want replacing if it can't be freed.

 

[mlance]

Thanks for your help I will take a look

 

[someonelse]

Probobly the same issue that I had. Resolved with help from here. See my thread:

//www.diynot.com/forums/plumbing/honeywell-3-port-valve.337441/

Also I found the video clip at the end of this page helpful on diverters/3 port valves:

http://www.plumbteamltd.co.uk/portvalve.html