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Mr Derrick Cole, an ex-Potterton engineer. XB104

So I called in a very pleasant, very professional man who arrived 24 hours later, diagnosed a faulty pressure valve, and clagged up pipes, fixed it in one hour with the parts he had on the van and charged me a very fair price. OK ever since. PS the boiler was secondhand when I had it...

So I did, and it did. Thanks for the diagnosis. So, yes, my (or rather the boiler's) expansion vessel needs to be recharged. Can I do this myself, or is it a job for a professional, please ?

Low Pressure My Potterton Lynx combination boiler has suddenly started complaining about 'low pressure' and refusing to work. I turn on the water inlet tap long enough for the needle on the dial to go back up into the green area, but it's back in the red 24 hours later. There's no sign of...