Thermostat does not follow programmed schedule; temperature changes occur at wrong times or not at all.

Safety warning: No electrical work is needed; all steps are via the user interface.

• 1. Verify time and date:
  • Set correct time, date, and time zone on the thermostat.
• 2. Check for active holds:
  • Cancel any permanent or temporary holds that override the schedule.
• 3. Review schedule:
  • Delete and recreate the schedule to remove conflicting entries.
• 4. Update firmware if available:
  • Install any Lennox updates that address scheduling issues.