vokera linea 28 and when i switch it on to just hot water the radiator?

i have a vokera linea 28 and when i switch it on to just hot water the radiator also when the radiator and hot water switch is on but thermastat is of and timer of still i get hot radiators.please has anyone had same problem and could you tell me the diagnosic.
Ivan Charles Spurgeon, July 2008


done
check motorised valve, you could check bobbin that is behind valve.

Big A, July 2008
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