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If Molly's suggestion isn't the reason in this case, take a look at your "setback" temperature, and the timing of related HVAC schedules which have a value of 0.5 (which would trigger operation to the setback temp not setpoint temp). The reason I suggest that is that you suggest the temp is fairly constant at 25C outside normal setpoint times. If neither works then I suggest you submit a ticket to the Support Desk with the model and they should be able to resolve it.