My heating only comes on when my cylinder calls for heat then shuts off when 
cylinder gets to temp. There is a 2 port valve on the heating that opens and 
closes with the room stat. I've tried a different programmer so its not 
that.
Help anyone.
Thanks

"Mike"  wrote in message 
news:djj6gb$1fn$1@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com...

> My heating only comes on when my cylinder calls for heat then shuts off 
> when cylinder gets to temp. There is a 2 port valve on the heating that 
> opens and closes with the room stat. I've tried a different programmer so 
> its not that.
> Help anyone.
> Thanks


It sounds like you may have a S plan system.

Have a look at http://content.honeywell.com/uk/homes/systems.htm
to be sure.

If it is an S Plan then the micro switch in the heating 2 port valve has 
failed (or you are lucky then its may be a loose connection in the wiring 
pack)

You may be able to change the microswitch or just the head on the 2 port 
valve.

Adam

Thank you

"ARWadsworth"  wrote in message 
news:e3a7f.136468$G8.89756@text.news.blueyonder.co.uk...

>
> "Mike"  wrote in message 
> news:djj6gb$1fn$1@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com...
>> My heating only comes on when my cylinder calls for heat then shuts off 
>> when cylinder gets to temp. There is a 2 port valve on the heating that 
>> opens and closes with the room stat. I've tried a different programmer so 
>> its not that.
>> Help anyone.
>> Thanks
>
> It sounds like you may have a S plan system.
>
> Have a look at http://content.honeywell.com/uk/homes/systems.htm
> to be sure.
>
> If it is an S Plan then the micro switch in the heating 2 port valve has 
> failed (or you are lucky then its may be a loose connection in the wiring 
> pack)
>
> You may be able to change the microswitch or just the head on the 2 port 
> valve.
>
> Adam
>