Responded to customer report of no heat and critical alert on thermostat indicating communication failure with Smart Hub. Diagnosed issue was related to power interruption when customer shut off breaker earlier in day. Restored system functionality by cycling power to reset communication between thermostat and Smart Hub. Performed comprehensive inspection of 4-year-old Lennox furnace with no issues found. System tested multiple times in normal and test modes, confirming proper operation. Customer advised to cycle power if issue recurs and recommended routine maintenance to prevent future problems.
