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Just to say that I took the programmer off and the connections look reasonably secure, I tightened them anyway. No shorting strands evident. I have found a reason why I can turn the boiler/pump off from the programmer now when I could not before. HW not called for on programmer cylinder...

Thanks for your replies. This thing is driving me nuts. At least I am not cold :D D.H., in response to your question about when I disconnected the stat wire from the white wire with the fault present, the stat wire was 0v, and the white wire was 240v. This 240v can only be coming via the...

I have fitted a new actuator and we can now rule that out as the boiler continues on with both thermostats turned down. I am pretty certain the valve is not sticking - and in any case it is only a week old. When in the fault condition with both stats turned down the manu/auto lever is...

Thanks for your post D.H. I ran through all the tests in sequence. All tests behaved normally apart from the following anomolies : In test 3 (CH & HW) the implication in the step to turning the cylinder stat up, is that this action should trigger the boiler to light. However the boiler...

That's a great reference diagram, thanks. The wiring (sadly) appears to be OK. This is a photo I took before I started making any changes, and the system was fitted in a new build and worked properly like this - and it matches up the same now after fitting the valve. I note that the order...

Just carried out another check. With system turned off, and both stats turned down I turned the system on and turned the room stat up - boiler fires up /pump runs - CH is running. Turn the room stat down CH continues to run. Checked the voltage on the white wire where it joins the feed from...

Yes grey has two wires, white has one. I have been checking the wiring out in the airing cupboard and it seems fine, I now need to run some checks down to the room stat down stairs and across to the programmer - these are more difficult to do as the wiring is concealed. One thing I have...

Yes sorry, poor terminology, the boiler is NOT "tripping" as in needing a reset, it just stops for a short period every now and then and fires back up. It used to do this when it was all working OK, so I assume it is normal. I mentioned it in case my description of running continuously was...

from No 17 in the FAQ "CH Only Test (Port A open) Turn Power OFF at main connection for the system (turning CH and HW OFF at programmer is not sufficient) This resets the valve to rest position Disconnect white valve wire from terminal T5 and grey wire from terminal T7. Connect white...

History: Open vented Y plan system originally had a problem where CH could not be obtained. Doing the CH two wire test on the 3 port valve, showed that this was at fault. Replaced the 3 port valve with a Honeywell 4073 one at the weekend. I am an electronics tech, and also took a photo of the...

Changing the 3 port valve went really well so thanks for your help. However, I now have another problem - which could have been there all along as the previous fault was that the 3 port valve would not give CH. The new valve works great in all three positions - However. Once CH alone is...

Many thanks for replying in such detail.

The motor I took out had no coupling between the motor shaft and the output cog, although the motor winding was not open circuit. I believe the new motor is OK.

Hi Can I start by saying I have read the FAQ on "Draining down you CH system", however I have a couple of further queries on this procedure and would be very grateful for any advice. The background here is that even though I have replaced a faulty motor and a faulty uSwitch in the 3 port...

Just to check. Having replaced the motor and established CH was again working, it is now reluctant to move the valve over. If I call for just CH (as per the CH test with grey & white wired to 240v) the valve DOES NOT move. If I move manually to about halfway, the valve then starts to move...

OK thanks. Unless the uswitch is likely to react to some WD40, it looks like I have a valve replacement to do. I have done basic plumbing with compression joints & speedfit, so I am confident I can change the valve over. What I dont have a clue about are the steps needs to prepare the system...

I did a number of checks after fitting the motor, including, starting with everything powered off and then calling just CH and observing the boiler light up and the radiators getting very very hot. Job done. However, we have had a warm few days since Thursday and the CH has not been needed -...

Fitted a synchron motor from ScrewFix (£13.00 plus delivery). Heating system is now working again. The fault with the motor seems to be mechanical. I could spin the output gear cog of the broken motor - the new one was much harder to turn. The old motor was obviously running flat out (it...

The radiators do not get hot in any combination, except if I manually override the valve using the lever. I have a new motor coming today. I will need to modify the flying lead, before I fit it though. I will post my results.