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Guys & Gals Having a nightmare with this. Please help. Built an extension and have run a flow and return for a new Rad in the new extenstion. Everything went to plan except the new rad doesn't get hot. The system seems in tact and there is water in the new rad (bled it and water comes...

Just moved to a new house and the heating system is only a few years old (as old as the house) and the controller is a Potterton EP2002. When the heating is on it doesn't always bring the house up to the temperature of the thermostat. For example it just comes on for approx an hour until the...