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Last one! Should I leave the loop between 4 & 5 until I install a room stat? Was thinking about the Honeywell wireless DT92 http://europe.hbc.honeywell.com/cz/pdf/en0h8580uk07r0309.pdf doesn't explain very well how to connect using Y Plan

One final question, Am I OK running a two core + earth flex and using that for the extra HW Off wire? and leaving exsiting 5 core in situ?

Thanks again, called Honeywell and you're spot on, no HW OFF to grey/valve means it will never work, so looks like I will have to run a new cable from wiring centre to programmer! thanks for your help.

Thanks for the reply stem. OK checked the wiring and it follows the diagram exactly - but with the following exceptions: Loop between 4 & 5. (valve white on 5 as diagram) - I guess because no room stat? Boiler As per diagram but has two extra black wires which go to terms 9 & 10 9...

Wallstar Oil Boiler located in kitchen Honeywell V4073A 3 port mid pos Valve Grundfos pump under 3 port valve. Honeywell ST6400C programmer Honeywell L641A cylinder stat No room stat I've never been able to turn on CH without HW, boiler only fires up when HW is turned on at same...

Thanks for responses. I guessing they must be different drops which means they were bypassed when I drained-down - oh dear! Not sure I'm confident enough to take rads off or fit a drain point.

Thanks - really? I thought downstairs drain-offs should empty all rads! If I flushed water through using F&E refill and continuous drain, will this be good enough to clean those downstairs ones?

OK, decided to drain CH system to clean it with Fernox restorer and add Fernox protector after clean because I don't believe it's ever been done in the 6 years I've been here. I have a standard Open Vented with F&E tank and 16 rads, two rads downstairs have drain-cocks (on rads I had installed...

Thanks, so you think it's wiring or valve related? Any idea why water is so hot when set to 60deg? I looked on back of programmer and see wires only on L, N, E and connectors 3 and 4, this doesn't look right to me when looking at wiring diagram for the 6400C.

Wallstar Oil Boiler located in kitchen Honeywell V4073A 3 port mid pos Valve Grundfos pump under 3 port valve. Honeywell ST6400C programmer Honeywell L641A cylinder stat No room stat! 1) OK this system was in before we moved in 6 years ago, no change to anything. We have never been...