Lennox · Appliance Systems
A critical error has occurred related to the system's high temperature protection. A pop-up screen will appear indicating this condition. The error code is displayed as 0004. This notification is critical and may require dealer assistance.
Click steps to track your progress.
Press the back button to dismiss the pop-up notification.
Contact your dealer to resolve the issue.
Check system for obvious obstructions or issues.
Ensure proper airflow around the unit.