Johnson Controls Scheduling / Real‑Time Clock Issue

Thermostat does not follow programmed schedule; remains at one temperature or changes at wrong times.

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Possible Causes

Schedule disabled or set to hold, Incorrect time or day settings, Corrupted schedule data, RTC backup failure causing resets after power loss

How to Fix / Troubleshooting

Safety: No electrical work required.

  • Step 1 – Check hold status: Ensure the thermostat is not in permanent hold or vacation mode. Cancel hold if active.
  • Step 2 – Verify time and date: Set the correct time, day, and time zone, or enable automatic time sync if available.
  • Step 3 – Review schedule: Go through each period (Wake, Leave, Return, Sleep, etc.) and confirm times and setpoints are correct and enabled.
  • Step 4 – Clear and reprogram: Delete the existing schedule and re‑enter it from scratch to clear any corrupted entries.
  • Step 5 – Check backup power: If schedule resets after power outages, inspect or replace the backup battery/supercapacitor if your model uses one.
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Repair Difficulty

Easy 2/5

Required Part

Backup Battery / RTC Circuit
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