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Thanks for that gas4you, that's exactly what i did and it all seems to be working fine. I have another question which i wonder if you can answer. All the wiring for the system centers around a honeywell wiring box, in the box are links which depending on your setup should be left in tact...

Blimey that was quick, thanks for the reply Chris. So the CM67 just replaces the themostat then?

Hi, I wanted to replace my potterton EP 2002 programmer with a honeywell CM67, couple of questions. 1. Is that possible? 2. The existing wiring for the EP 2002 is N L 1 = hw off 2 = ch off 3 = hw on 4 = ch on 5 is a Common you link to L The CM67 seems to only have the...