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your guess is as good as mine. Thats the way he wired it up the first time. The wiring was replaced because the straight swap of the unit didnt work (no L to L1 was wired) Anyway, good to go now though. Thanks alot for your replies. Apreciate it. Cheers

Thats what I was told caused the blow out on the first unit..?

issue solved, its not a simple transfer of programmer from danfoss to honeywell since honeywell programmers aren't capable of powering anything. i returned the honeywell unit and got the danfoss fp715si and connected it up and hey presto, everything running now. thanks all for your help

The first unit was supplied by the engineer and I wasn't charged anything at all for his attempt, not even his time. He explained that it was supposed to be a simple swap of programmers since it was the industry standard back plate. Since he couldn't make it work he said I needed to find someone...

Hey, thanks for your reply :) This boiler does have a P/L as it has a frost protection themostat internally. It must be the programmer then since its not powering anything. I rewired it with the programmer and P/L on the boiler connected to the mains. The pump live and boiler...

I'll apologise in advance if this makes no sense to anyone... I had a heating engineer in to change a Danfoss FP715 programmer to the Honeywell Sundial RF2 Pack 1. It was supposed to be easy where the new unit would fit onto the old back plate but it didnt, so he disconnected everything and...