In an earlier contribution to this discussion,
IMM wrote:


The CM67 is only
optimised on, in the morning period, so I believe.

This does not stack up with my experience! My CM67 is programmed to provide
a lunchtime boost of 21 degC from 12:30 to 13:30 having been set back to 18
degC for the morning period. The boiler usually fires up just before 12 in
order to achieve the target temperature by 12:30. If you monitor the target
temperature on the stat, it changes this from 18 to 21 at the point when it
decides to fire up, rather than at the programmed time.
--
Cheers,
Set Square
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