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Thanks OILHEAD for your reply, thats the conclusion I have come to too. Through my testing, both the room and tank thermostat seen to respond getting the boiler to fire up but the water dosent get to the tank for it to achieve the required temp, instead it just blasts around the rads. turning...

Please help, I have recently noticed that my CH system has gone mad constantly giving HW to the rads when the house is already hot. Through a together with this it stopped heating the HW. I have discovered that the boiler is correctly responding to the thermostats but for some reason the...