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our hot water supply isnt consistently hot. It fluctuates between hot and cold every few seconds. our boiler is a ravenheat combi 85. Any suggestions on whats causing this? Thanks

When we turned on the hot water tap in our kitchen this morning the hot water suddenly turned cold and there was a loud banging noise from the boiler - plus the pressure was fluctuating wildly from 1.5 to 2. Since then we've had no hot water. Our boiler is a Ravenheat 85 combi, fitted last year...

Hi The two radiators in our downstairs extension are cold, and have never worked since we moved into our house last november. Also I am having to reduce the pressure in the boiler every day as it creeps up from 1.5 bar to over 2.0 bar. I have replaced the thermostat valves on both these...