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[quote][i]Originally posted by mattk[/i] I had this the other week. with a promax. it was brand new, fitted it, fired it up, heating was working ok, when hot water was called for the fan would speed up and slow down repeatedly. folowed by a woooshing noise. I checked the inlet pressure and it was 13mb. checked it was set right and it was. stripped the gas pipe out and it was blocked full of black carbon confetti. renewed the gas carcass and it was ok I fit a promax everyday of the week nearly. they are a great boiler. I have one myself. never have much go wrong from new, it will be something to do with the rest of the system deffo get someone to have a look at the gas pressures on it, heating doesnt use the full 28kw so it will work on heating ok, its only when the gas valve is full open for hot water you will get problems [/quote]
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