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I replaced a transformer on a hall light. There's another identical light in a different part of the hall. Stupidly I didn't make a note of which light wires connected to which circuit wires. Anyway after wiring up and switching on both lights came on but all bulbs in both lights were at...

Just to give an update on this....the builder sent an electrician today who confirmed the problem was indeed the programmer. But he couldn't supply a new one - the plumber has to do that - he just wires them! Until then he's done something to the wiring which causes the heating to come on...

Wow - that's a very detailed explanation bhm and the most worrying thing is...I actually understand it! :) Makes perfect sense - thank you. So does that mean it's the opening of the valve that actually triggers the boiler firing? Ian

Pampers - no outside sensor. bhm - very good point - I hadn't realised the significance of that. House builder sending someone next week - in meantime will stagger timed hot water and heating on the morning so they don't overlap! Thanks Ian

Dan - worked fine until recently. As far as HW is concerned yes boiler shuts down when up to temp. But CH will still not come on unless HW is off at timer. A few more tests today... If HW and CH lights are both on, switching HW off does not make CH "kick in" - CH has to be turned off...

Hi Dan - thanks for your quick reply. Yes - if say, running on timer, both green lights are on. Visually timer is working correctly. Just had a browse through this forum - looks as if culprit could be the motorised valve (4043H) Ian

House is only 6 months old so hopefully will get this fixed under warranty. Noticed recently radiators not heating on morning (Honeywell ST9400C timer, Ideal Logic 24 boiler). After some experimenting it seems that if the controller has HW on (green light on) then switching Heating on...