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Ive had a new system boiler fitted and I cannot control ch via the room thermostat. The upstairs radiators dont seem to come on . The ch doesnt come on if there is a full tank of hot water. I cannot get ch when I want it to come on. Do you think it might be the electrics. They have been back to...

I have recently had a new system boiler fitted and the heating comes on when it is switched off. The hot water is timed to come on twice daily but whenever the water is on then the heating comes on even though it is switched off. I have had a replacement valve fitted and its still the same...