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The behaviour is the same regardless as to whether the programmer stops calling for HW or the cylinder stat stops calling (I believe). Having said that I have only tested exhaustively by using the stats. Due to the location of the timer versus the actuator, cylinder stat and room stat it is...

240Vac on terminal 8 240Vac on terminal 7 0Vac on terminal 16 0Vac on terminal 8 (obviously) So it's a banjaxed cylinder stat that I have?

Posting this piecemeal: At the actuator connector block I have the following CH only from scratch 240Vac at Orange, grey & white CH & HW Grey 140Vac Orange 240Vac White 240Vac HW Only Grey 30Vac Orange 240Vac White 0Vac Nothing on Grey 240Vac Others 0 Vac When in the...

Thanks to all of you for your detailed advice and suggestions. I plan to go through everything with the multi-meter methodically this weekend. I will post back my findings.

I do but I've not used one on AC before. Probably time to call in the pros. At the moment I have changed the timings so the HW comes on and does it's thing and then the CH comes on, so the two are separate. Should give me a viable workaround.

I managed to replicate the issue last night. So I spent a good while playing around with various settings and worked out the scenario that causes the issue. This was with the actuator off. If the HW and CH are on and the HW goes off the CH never fires. The actuator doesn't move when the HW...

Thanks - it'll be tomorrow morning again before I can try with the actuator off. Will let you know how I get on!

Thanks - so the mechanical movement of the valve makes the electrical connection to the orange? If the valve doesn't move the whole way this connection won't occur and result in what I am seeing? Would the turning off of the CH, turning on of the HW, turning off the HW and then turning the CH...

The clicking went away when I replaced the actuator. The HW off is wired in. That's number 8 in the wiring centre from the programmer and 7 from the valve. 10 is HW on and 9 is CH on from the programmer. Don't forget this system has been in for a few years and all worked fine. It's just this...

So in the first picture the orange wire is on the left at the bottom. This links to the yellow/green which in turn is fed to number 6 in the wiring centre. The white wire is actually the white/brown wire next one up from the bottom on the left which links to the brown on the right. This brown...

Ok, so last night I tried to replicate the problem. I had no joy, the system worked flawlessly through all combinations. I woke up this morning and the same issue occurred. The HW was off. The room stat was calling for heat. The RX1 light was on. The programmer was on for CH only. No boiler...

thanks doitall - I will check out all options tonight and let you know. Appreciate the responses from all.

During the summer when the hw only was selected the rads were heating up. Spindle on the valve was moving freely. The actuator was making a constant clicking sound when HW was requested. Since I replaced it that issue went away.

The programmer is an FP715.

Not at all doitall I just didnt think there was a clash between thecontroller and the RX1 unit. There may well be an issue with the programmer. Is this something that goes wrong with the heating controllers? I did a hard reset of the controller but the problem remained. It also doesnt explain...

Thanks 45yearsagasman - yes I checked that the spindle moved freely, which it did. Since replacing the actuator head that particular problem went away.

D_Hailsham - excellent. I remember these two wires when I fitted the replacement head. Perhaps one has come loose. Looking at the wiring diagram I linked to I thought it might be the grey wire that was the culprit. I will check that tonight when I get home. Any idea why it works in the...

Unfortunately thats not an option at the moment :( I should have said that the system has been in for a number of years and has been working flawlessly (except for the recent actuator replacement) so there is no issue between the controller and the RX1. It's the specific scenario that...

Hi All, Long time reader, but not a regular poster. I have a strange problem with my CH/HW setup. First I will list the parts. Glowworm Boiler Danfoss Electronic Timer with separate water and heating functions - 7 day programmable. Cylinder Stat Danfoss RX-1 room thermostat (all working...

Hi, First posting. I've done hours of research on flush pipes, toilet leaks etc etc but I have the following problem/question and hoped someone could advixe. I have a back to wall toilet with a concealed cistern that is located in a vanity unit. The unit is just a box with a lid at the top to...