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Hello, The water pressure in my combi boiler slowly drops. I normally fill it up to around 1 bar and it takes around a month for the pressure to drop down to near zero - which makes for a cold house when I get back from work. I've just checked all the radiators and I can't find any...

I have an Ideal Response 80 combi boiler. All the upstairs radiators have thermostatic valves, all the downstairs ones have normal valves. I don't have any water tanks. When the central heating system turns on from cold, after approximately 25 - 30 minutes a noise starts coming from the...