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Why is my upstairs heating always on?

My heating system has a timed controller downstairs and a Drayton Digistat 3 Controller upstairs. Both appear to be working correctly but for some reason the upstairs radiators are constantly on even when the controllers show everything to be switched off. Normally, when the upstairs system is heating a flame symbol appears on the Digistat controller but now, even when this symbol is off, the radiators are still on. Has anybody got any ideas what might be wrong?
Deputysherrif, December 2012
My boiler is a Glow Worm 24 hxi and I am afraid I don't know in great detail what my system is as I have very little knowledge. In the cupboard with the water tank there is a pump and several pipes two of which have two boxes with black switches on marked A and B. One is marked down flow and the other up flow. There is a header tank as well. Other than that I cannot offer any miore useful detail. Sorry!

Deputysherrif, December 2012
hi its most likely a faulty diverter valve allowing water into the heating to flow when the heating is of. if u can tell me the type of boiler and the system u have and we can diagnose from there pls put up another question

kash, December 2012
link Click here to see other fixes for Drayton Digistat 3.