Recent content by Mikey B

I, kind sirs, have heating !! Seriously, can’t thank you both enough, couldn’t stand another night of Mrs trying to warm her feet up on my back !! quick celebratory beer while I figure out timing programming.

Thank-you… gone for the more ‘aesthetically pleasing‘ wider backplate

Junction box : Black wire from backplate move from 7 to 5 for HW ?

It’s slowly sinking in (sorry) backplate : So I’ll leave the current backplate in place for ease. N, L and earth remain as is. I don’t need anything in 1 HW off or 2 CH off, Black into 3 HW on and the unused grey into 4 CH on.

Just checking now and it’s exactly as you describe - top left goes to BR1 Top right to BUT2 backplate. That sounds very easy… The black in T5 would just be removed along with the rest of the wires for BR1, where would the grey wire from T5 go?

Thanks to you both so far, the current problem is the BR1 isn’t sending power to the backplate when the thermostat tells it to hence no heating. I now understand that the new programmer can program both heating and HW whilst the old boss therm would only do one and that’s why we had a...

Makes sense as the existing BUT2 has no pin in position labelled 1, has them for NL234 so that is for the second channel? I think the extra wire is there - the grey one that isn’t currently connected ?

Yes - exactly that, the BUT2 was programmed to turn on hot water 3 times per day - it did nothing else and the BR1 turned the heating on when the remote thermostat triggered - that had its own timer program.

The Boss Therm BUT2, which hooks onto the backplate in the second pic. The new Honeywell ST has the same pins and looks as though it would hook on the same back plate ?

The Honeywell website also makes mention of a C-wire, which doesn‘t appear to be on the current set-up but the grey coloured wire going from the BUT2 backplate to control box isn’t connected either end so is spare if needed.

Have no heating as thermostat is not sending signal to boiler (Diagnosed by plumber) existing set-up is: Honeywell 42002116-002 junction box to Boss Therm BUT2 timer and Boss therm BR1 receiver with a remote thermostat. Now have a new Honeywell ST9400C Programmer and DT92E wireless room...