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Thank you for your advice. I don't have any other gas appliances sorry. Tonight the boiler fired up after three presses of the red light, then stopped and restarted itself continually for about five minutes [CH mode] before I switched it off. I waited twenty minutes and tried again, and it was...

Help needed please with an Ariston Dia 20 MFFI CE combi, around 10 years old. The boiler was refusing to fire up at all. Called out an engineer, who checked it over and diagnosed a gas supply problem at the LPG tank - a faulty UPSO/OPSO valve. Spoke to the gas company who own and maintain the...