Radiators Hot even when room thermostat is set to 10 degrees

[CamperPete]

Our thermostat for the central heating is the lounge and is set to 10 degrees ie I assume boiler shouldn't heat the central heating until temp drops below 10 degrees (Boiler also heats the hot water).

Problem is the upstairs en-suite radiator (next to the boiler housing) is red hot, switch this radiator off (via thermostat valve) but then rest of upstairs radiator are hot, switch them all off upstairs but then the radiator at bottom of landing is hot!!!!.

I know you guys will know what's going on so thanks in advance for any feedback.

Cheers

Pete.

 

[gas4you]

Have you a gravity primary system or fully pumped?

 

[CamperPete]

Er, not sure what you mean Dave as I'm totally thick when it comes to plumbing ......... It's a new build house (6 yrs old) with a Potterton Suprima boiler if that helps?

Cheers

Pete.

 

[Dan Robinson]

Suspect you have a Y-plan an the system is back feeding. But you need to post more system information.