1. Customer Complaint • Downstairs thermostat showing 85 °F+ despite being set to a normal cooling temperature. • Home felt uncomfortably warm earlier in the day. 2. Remote Monitoring (Pre-visit) 3. On-Site Evaluation • Ambient conditions on arrival (4:00 PM): Downstairs zone now over-cooling (≈ 68 °F). • No error codes or lock-outs on air-handler or condenser. • Visual inspection of equipment and airflow showed normal operation. • Conclusion: Mechanical components healthy. Focus shifted to controls/software. 4. Diagnostic Findings • Accessed thermostat & zoning controller via 360 App from attic junction. • System Event Log: Automatic firmware update recorded at 04:12 pm, July 3 2025. • Post-update, thermostat’s internal temperature reading drifted ≈ 10 °F higher than actual room temperature, confusing the control algorithm (caused prolonged cooling call, then overshoot). • Confirmed anomaly with calibrated digital thermometer at thermostat location. 5. Corrective Action