What It Means
- Normal Operation - Idle, Continuous Fan, or Cool
Lennox Ducted Heating
Lennox Error Code Slow Heartbeat
Ducted Heating:
Causes & actions from Lennox
How it shows
- Integrated control red LED: Slow Heartbeat
This manual entry does not list further causes or actions.
Applicable models & manual sources
- ML196UHE
Normal Operation – Idle, Continuous Fan, or Cool
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.
What should you check next?
Continue in ACLogics with guided diagnosis for your equipment and symptoms.
