faulty knob perhaps?would req resistance checks-are there thermostatic valves on rads?did this happen to all rads at same time or over period of time?sys might be set at full ch temp regardless of knob-google for boiler manual-have a look at fault/troubleshooting guide/if u can download service manual for engineers(assuming there is one for your model)there probably be more info regarding ch temp setting
eddie
January 2010
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