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Thanks to everyone who posted replies to my query. I have loosened the nut on the cylinder and there was air in it. But had to get a man in to get the back boiler to stop overheating, apparently it was because there was a air block in a pipe on the gravity fed hot water circuit which wouldn't...

The valves on the bathroom radiator are both open but still getting no hot water,(as per Beerlovers suggestion) the radiator is also very hot and is connected to the hot water system. I can hear air bubbles in the pipes that run from downstairs to upstairs so i know there is air in the system...

I changed the thermostatic valve on a radiator in my bathroom and since then i have had no hot water. I have a primatic hot water tank in the attic and it just refuses to heat up. I have a back boiler which ignites but i do not get any flames, and it switches off after 10 or seconds, but when...