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no problem, thanks very much for the help anyway. Ill keep on trying for the weekend any will give someone a call in the week.

Nope sorry, works ok all the time in DHW and both when tap flowing high and low... I think i have proved its not a water flow issue on the CH because when it starts ignition if i close the CH circuit off it shuts off gas straight away and there is no noise... Any other ideas...

yes, combi boiler...... MY hope was its a flow fault or pump fault on the CH circuit but do not know how these boilers are programed. Will it stop ignition for no water flow before or after burners are lit and is there a thermal cut out which may be causing the burners to stop if there is no...

thanks for the reply, why would it use different gas/air ratios for DHW and CH selections? this is what confused me at first because i was thinking it would be a simple common fault due to the boiler functioning fine when a hot tap is used???

Hi, Please can someone help, i have a RIVA Advance HE boiler and it has suddenly stopped giving CH and shows Lack of Burner Ignition on the Fault LED's. When i call for DHW all is fine and burners ignite and water temp is fine. When i call for CH, system starts, burners light for about 4...