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no, It just “counts” wrong As if it is missinf a second or so per day by now that has cumulated to about an hour

Hmmm... So it's embedded in the hard/software then Then indeed, adjusting time every now and then will be the only solution

Hi, I have 3 pieces of Honeywell CM907 thermostat in the house for my years. The one in the bathroom is the oldest one. This one does not hold time. Whenever I set time again to the correct time, it starts to run behind over time. It does so slowely, meaning it now runs behind over an hour...