On 07/03/2020 16:11, rick wrote:
Been getting on with work on my parents hose which they persuaded me to
buy.

Heating system is standard single zone rads to a Baxi 105HE Condensing
Combi boiler.

Checking out its all working - found the wall mounted Honeywell
thermostat had no effect on boiler, the system in fact being controlled
by the timer control on boiler and the heating temp dial on boiler.


The system is under service contract with British GasÂ* (who did annual
service & safety check in Jan)Â*Â* so called them.
They explained that separate thermostats are mandatory since 1982 so if
faulty it would have to be replaced.

On inspection they found it was not wired in the boiler (yellow wire
link across where stat would be wired) ... and no cable there, assume it
must have been 'cut out' when previous non-combi boiler was replaced 5
years ago.Â* Honeywell stat certainly used to work with old boiler
(simple bi-metal type)

I did ask how it passed the annual boiler & controls service if it
doesn't work - no answer on that.

It would not be easy or neat to run in new cables .... so I have 2 options.

1. Fit a basic Remote wireless thermostat-anybody know of a simple one?,
don't need programming options as there is a programmer timer on the
boiler.
British gas are also preparing a quote, for this - though may do it myself.




I fitted a Salus (check spelling) one for my eldest. It seems to do the
job. From memory, it was about £35.

The Hive one will work in 'dumb' mode, ie without the internet- just buy
one without the hub. However, it is more expensive. Against that, if you
have standard controller backplate, it is easy to fit.

The Salus one I fitted was a dedicated one for the system (a straight
plug in more or less) but they do generic ones, I can't comment on
fitting these.