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All sorted now. I decided to rip the controller off the wall, and found it to open up nicely displaying all the wires and what they were connected to. both the black wires were for HW, one live when on; one live when off as i found earlier (not sure why you'd want a live one when off). Anyway i...

Ok, now I'm really confused. The second black cable is not always live, it seems to be some kind of inverse to the HW wire. When the HW is on the first black wire is live and the second one off, and when the HW is off the first black wire is off and the second black wire is live. What on...

Thanks for the links very handy. If we ignore the wire colours that have been used then I still think there is a problem with the controler. The honeywell diagram only shows 4 wires entering the controller/timer. If we first ignore the neutral wire which is there only for it's internal power...

Right, Got myself a new motor fitted it..and nothing. Thought it was time to resort to the multimeter and put some kind of diagram together. Unfortunatley it appears the system was wired in by a colour blind incompitent fool. First Take a look at the HW side and everything looks logical...

Not the most useful of posts. :roll: First of all what is the controller make and model. Secondly what exactly is the problem? Are you havign problems working out how to use the controller, or is it set correctly but just not working correctly. ie Is the heating coming on when the...

Can you expand on misbehaving? You say it can only be controlled by turning the boiler on and off. Does this mean that it is constantly 'on' when on regardless of whether the controller says it should be or not? The fact that you have already found a problem with the valve suggests that...

You say the hot water is very hot regardless of the tank stat and that the pipe work from the tank to the valve is stone cold. Seems a bit odd to me. You don't by any chance have the tank emersion heater on 24/7? These arn't normally connected to the tank stat and will just heat until they reach...

Hi, thanks for the advise. Probabbly got my terminology wrong. I said dip switches but they are more like micro-switches. Actually they remind me of those on my competition pro joystick back on the good old Amiga 500...anyway I digress. I also said 'depress' for some reason when I actually...

Just found out holding the switch in on the CH valve turns the CH on regardless of anything else including the programmer!?! Guess this will be a very manual system. In fact the only thing which seems to turn the boiler off now is turning down the stat on the boiler. What is this for...

Hi I'm new to this house owner type stuff but am keen to learn. I recently moved into my first home and whilst the hotwater is working nicely my central heating will just not come on. When I turn it on simply nothing happens at all. I have tracked the problem down to the motorised valve...