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To check expansion vessel, first you will need to locate the dust cap, remove the dust cap and quickly press the valve in, if water comes out then the vessel is faulty, as only air should come out. To check the correct charge, you will need a pressure gauge and the system pressure should be at 0...

You normally do not get scale in the central heating flow/return pipework, but in the secondary heat exchanger. Normally sludge builds up in central heating system and this can cause problems in the hot water heat exchanger. You should have got the radiators and pipework flushed before you...

If it has water in it, you will not be able to solder it. You may not get all the water to drain down because of the way the pipework is installed, why not just use compression joints then you do not have to worry. Regards Maxgas

I take it you have checked the safety discharge pipe and it is not coming from there? You only need a very small leak on these systems to drop the pressure, I suggest you check each rad valve by wipeing your fingers around it and see if you notice any water, if not then it could be a pipe which...

You are right not to mess around with it yourself, get british Gas to look at it, but just for your info it is behind the front cover on the left hand side, brass with a microswitch with 2 wires going to it, cannot remember the colours off hand, yellow or orange I think.

Hi , If you have a fitted a new tap it could be that it has the smaller type flexi hoses fitted to it, they will slow down the water flow and can cause the boiler not to fire. I have a customer who installed a new mixer tap, and since it was installed it will not activate the boiler for hot...