Any house that doesn't have the correct rads or poor heat losses will find that optimum start is always active for up to 3 hours before the time required.
Early model CM67NGs with optimuum start enabled do some funny things.
We used to have a written directive to our installers to turn OS off on these models due to the strange behavior, as said, 3hrs early heating on was common. We had a rash of complaints around 2005 from confused householders.
This was cured on later versions of CM67 but I can see why you'd want to turn it off!
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