Saunier Duval Scheduling / Time Program Fault

Thermostat does not follow programmed schedule; heating turns on/off at wrong times

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Possible Causes

Incorrect time or day set on thermostat, Overlapping or conflicting schedule entries, Manual override left active, App and thermostat schedules out of sync

How to Fix / Troubleshooting

Safety: No electrical work required.

  • Check time and day: Verify the thermostat shows the correct time and weekday. Correct if necessary.
  • Review schedule: Go through each time period in the schedule and ensure there are no overlaps or unintended comfort periods.
  • Cancel overrides: Clear any manual overrides or "holiday" modes that may be forcing a constant setpoint.
  • Sync with app: If you use the app, ensure changes are saved and synchronized; wait a few minutes and confirm on the thermostat display.

If the thermostat still behaves unpredictably, perform a factory reset and reprogram the schedule from scratch.

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Repair Difficulty

Very Easy 1/5
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