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Hi guys, been to see a Main Combi 30HE today that won't fire up. I've not come across this problem before. When powered up & call for heat, the fan starts, aps makes, pump starts then dhw led flashes accompanied by a repeated click click click as the hydraulic differential pressure pin & switch kicks in & out constantly. That's as far as it goes. Checked the switch is making & breaking electrically, seems fine. Dhw priority pin & switch doing what they should. I'm told it had the diverter replaced in the last year but was working fine. Ideas welcome please