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Thank Christ for that. I bet that was like pulling teeth for you eh Freddo?

Yes, terminal 1 (I was going off terminal 4 of 7). I just wired terminal 1 to terminal 4 and fired it up, boiler kicked in when heating demanded. The voltages from earlier i tried again with both stats set to max: HW W=0v, G=0v, O=240v HW/CH W=240v, G=73v, O=240v CH W=240v, G=73v, O=42v If...

That sounds like my kind of fault finding........ I'll try it later when the kids aren't wrapped around my ankles. I was thinking of splitting the unit apart and sticking the unit back in place by the pins so I can get my probe down the back of it while it's still on. On a side note, I checked...

Freddo, I've just re-read this thread and realised how novice I sound. Now having more than a hunch of how the system is supposed to operate, it is clear that the programmer isn't playing ball so I'm going to check each terminal properly to confirm before I splash out my hard earned money on...

You're a star Freddo, but I'll to give it a shot in the morning as the nipper is in bed and the airing cupboard is in her bedroom. From memory of fiddling around with it earlier, I DID try that and the valve didn't move. It would only move with HW off. As soon as HW is switched on, the valve...

Update: Just had it set to CH only, valve motored and made S1, I made S2 with a non metallic pokey thing, a relay inside the valve head clicked (A LOT) and the boiler fired up until I let go of S2. I've checked and checked again for loose wires and I'm certain the programmer (Honeywell...

Well.......that's just pi$$ed on my chips. I was certain it was the valve head as S2 isn't making when it motors over

HW off, CH on; White=240v Grey=around 70v Orange=around 40v I'm really tempted to try and make S2 with something non conductive and see if the boiler fires up

Ahhhhhh. That makes more sense. Very helpful diagram by the way Freddo. When I took the cover off and watched it motor over, everytime it would only make contact with S1. The only time when it made S2 is when I motored it by hand but then it would bounce back as the lever rested in the gate...

Hi, I've have a question that might help me clarify what the fudge is going on with my system, in particular a Honeywell 3PV: When I switch DHW off and turn the stat up for CH the 3PV motors open but the boiler isn't firing up. I've checked for 240v on terminal 7 from the orange wire and I...