On 18/08/15 16:37, David wrote:
As posted a while back the LCD screen on the Honywell CM927 thermostat is
failing.

Pain in the butt, and now is the time to replace central heating parts
before they are needed when the cold weather returns.

The screen failure seems to be a known fault, so I am reluctant to lash
out around £100 for a replacement if it is going to fail again in another
two to three years. Then again my daughter has one and it is fine so far.

So is there an alternative wireless programmable thermostat with better
reliability and functionality for about the same price?

Dunno who the price compares, but a relative has been very pleased with
the HeatGenius system I helped them install.

ZWave based, Danfoss ZWave TRVs and wall mounted sensors which just
stick on with a sticky pad. Assuming the TRVs can mate with your valves,
the installation is a doddle.

The *only* downside is the only practical way to drive it is from a
phone app or web. Both are excellent - but it is missing a local wall
mounted controller.

That may not matter, or it may be a killer missing feature - but the
rest of the system has been extremely stable and well behaved as well as
insanely customisable.

A "cheat" to save on buying unnecessary TRVs (the expensive part) is to
not fit them to the bathroom(s) and maybe not to the main living room if
that tends to be used all day. There is a concept of "whole house c all
for heat" under the control of your schedule plus a master stat which
means you could just let these rooms heat when that, or the bedroom
zones demand. Just refit basic TRV heads to limit the temperature.