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Eureka!. The lovely CORGI man came this evening, changed the air pressure valve and the boiler has been running on DHW and CH for the past 1 1/2 hrs. so maybe (fingers etc. crossed ) the problem has been fixed, I do hope so it's cost me a bomb in teabags!! In retrospect the CORGI man did...

Thank you Tony for you quick response. Actually I did employ a CORGI registered gas engineer in the first instance to service the boiler, all he did was to vacuum out the combustion chamber, clean the burner and electrodes and check the fan, pump and flue. All appeared in order. He has been...

:cry: Hello, I have an Ariston Micro System gas boiler. Type C G.C.N. 41-116-06 or 41-116-07. Installed 6 years ago, no trouble in that time. Suddenly it locks out and I have to press the reset button to get it going again then only stays on for minutes. Have changed both PCB's and all three...