Lennox Appliance Systems
8 fault codes documented
Error code 0004 — High temperature protection
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.
Schedule hold permanently — Schedule overridden indefinitely
This message indicates that the current schedule has been permanently overridden. The system will maintain the current setting until the hold is manually removed.
Schedule hold until next period — Schedule temporarily overridden
This message indicates that the current schedule has been put on hold until the next scheduled time period begins. You can manually adjust this hold.
Blue flames icon — System is cooling
When the blue flames icon is displayed, it indicates that the cooling system is currently active and running.
Calendar grid icon — Transitioning to next schedule
This icon indicates that the thermostat is transitioning to the next scheduled setting. This happens at the time designated in your programming.
Red flames icon — System is heating
When the red flames icon is displayed, it indicates that the heating system is currently active and running.
Snowflake icon — Cooling mode, compressor delay
The snowflake icon indicates that the next mode of operation will be cooling. It also signifies that there is a compressor delay, which is set to 5 minutes by default and is not adjustable.
Waiting icon — Compressor delay active
The waiting icon signifies that the compressor has a delay before it can engage. This is a safety feature to protect the compressor. The delay is typically 5 minutes.