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Yes I agree! However, until very recently it has been working perfectly well for about four years.

The original installation had 2, but this was changed some time ago so now only 1.

Correct. Motorised Valve and programmer both new.

I removed the programmer and the CH still works using the FSU

We don’t have a room stat. Thanks everyone all the input by the way.

The valve only opens if I use the fused switch. It used to work fine with a programmer, stopped working, so I changed the motorised valve and timer but still no luck.

If I just use the fused switch the motorised valve opens and the system works.

Yes. It happened with the old programmer. So I thought the programmer was faulty so put a new one in. But still the same issue.

Nothing happens. If the fused switch is on the heating comes on even if the programmer is in the off position. Power also goes to the programmer.

Yes exactly! And the heating is working. I can operate the heating using the single switch.

I have a simple set up with a programmer opening a motorised valve/actuator to operate the central heating. Recently the heating stoped working. The valve still open scans closes correctly but I replaced the programmer - connections were the same as the old one (N L 3 4). I get the heating to...