In an earlier contribution to this discussion,
JoeJoe wrote:

Just bought the above wireless thermostat and a separate programmer
to control my combi. Both are 7-day ones. The reason for this setup
is that we do know exactly where we want to programmer/controller to
be positioned (for convenience reasons), but am not sure exactly
where to position the thermostat. The house is quite drafty, so we
may have to try a few places before we find the best one.

I run 2 x 2.5mm Twin & Earth cables from the boiler to the position
where the programmer is to be located (I can get mains feed either
from the boiler end, and also from near where the programmer is going
to be located). I also intend to fix the CMT927 receiver unit very
close to the programmer (~1m).

Does that make sense as a set up?

Not a lot!

The wireless programmable stat is *also* a programmer. If you have two
programmers in series, the heating will only come on when *both* are on. The
fixed programmer is a total waste of time and money - and will have to be
set to 'constant' to allow the programmable stat to work. So replace it with
a short piece of cable!

The base unit for the stat should be as close to the boiler as possible, to
minimise the wiring needed. The sensor unit - which, AIUI also incorporates
the display and programming buttons - can be unhooked from its perch and
taken to your 'convenient' position when you want to change the programme -
and then returned.
--
Cheers,
Roger
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