Potterton Profile E40?
Hi, i have an intermittent prob on a Potterton Profile e40, unsure if PCB: sometimes when boiler lit & running you can hear - i think the main gas valve - cluncking on & off (like relay chatter) & as it does the main gas burner flame jumps up & down as if gas supply being interrupted.
Gas valve or PCB any ideas please??
David W
January 2011
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