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Yes, it seems the yellow is permanent live from the boiler. I've now connected the blue wire from the stat with the Orange wire from actuator and brown wire from pump. Yellow wire is temporarily isolated, away from the others. I've put the programmer back on the back plate. With CH only...

Orange and dark brown which goes to the pump, yes. Yellow and blue are now in separate terminals. No reading on blue, 240v on yellow. Those two wires are not from the same cable. The blue one is from the cylinder stat and the yellow one is from the grey cable that goes through the floor boards

No reading from the orange wire once it has been connected to #5 (no reading from white or grey now either) Terminal it was connected to is reading 240v

With the wire that goes from cylinder stat to orange removed, I've still got 240v on orange. Getting a very small reading on the cylinder stat wire. Programmer is removed from back plate at this point.

There's one from the pump, one from the cylinder stat and one which goes through the floor boards which I presume goes to the boiler. Just to make sure I'm not being thick and giving you bad information, I've added a photo of the reading from the orange wire with the boiler turned off...

Think the programmer could be the issue? I just turned the heating on then off and I'm getting 240v through orange, white and grey. Actuator lever is still on H. I then removed the programmer and the lever moved to W. Now getting 240v on orange, 30v on white, 5v on grey. However, the pump is...

@stem With the programmer removed, multimeter reads 240v on orange, 30v on white and a small current of about 5v on grey

Forgot to say, programmer is acl lifestyle LP241

@jackthom

Sorry for the delay replying. With heating only selected and the lever on actuator at H, I have 240v on orange, 240v on white, 240v on grey. With everything turned off on programmer, orange, white and grey are all still live (actuator stays on H). With hot water only selected on programmer...

Thanks for the reply. Yes, I have a multimeter

I have a problem with my central heating and hot water and I'm hoping I can get some advice. This is going to be quite long, but I want to give as much relevant info as possible. Thanks in advance. The problem I first had was that my central heating was permanently on, even with the control...