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Hi All, Replaced Fan Modulating PCB, burner now stays on when CH requires heat. :D Once again many thanks to Tony for advice. David

Tony, Many thanks for the help, it is very much appreciated........ I also hope this request for help and your answer will help others..... I will post a reply to let you know how it goes.... Once again many thanks... David.

Can anyone help...What part needs replacing and what test can be carried out.... Problem Deman for Central Heating (CH), Burner lights, for 3 sec, reduces flame for 3 sec, then turns off, then starts trying to light again. If DHW turned on, wait until water hot from tap, turn off DWH tap, 3...