HELP Conundrum Midway Actuator wiring problem

[Spike47]

Hi

I have just changed a Siemens 3 port midway Actuator, now I only changed like for like at the Main terminal box, but when I switched the system on only the hot water is working, turn tank stat down and wind up the room stat nothing.

After fitting the same for same actuator, I noticed a bit of **** workmanship, a mains feed to a connector joining a 2.5mm2 flat cable, a 1.5mm2 flat, and a small 1mm2 white round cable , all wrapped up with tape .
Now has I was pulling the tape off I noticed the blue wire from the white 1mm2 just inside the tape, so I thought well if it has pulled out of the block there will be a terminal loose, but alas no loose terminal , so my Conundrum is as the room heating is not coming on, it must be, that the blue wire has come out of the terminal block, but which one ! .

PS: Just a note , they do not have a controller, it is just on a plug timer in the cupboard, if they want hot water quick they just turn the room stat down !.

Cheers
Spike
[automerge]1602004238[/automerge]
Sorted now .

Spike