Lennox Packaged Unit

Lennox Packaged Unit Error Code Slow Flash

Packaged Unit: Packaged HVAC (outdoor)

What It Means

  • Normal Operation - No call for heat

Causes & actions from Lennox

How it shows
  • dsi ignition heartbeat led: Slow Flash

This manual entry does not list further causes or actions.

Applicable models & manual sources
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.

Download on the App Store Get it on Google Play
Scan to install on your phone Free · iPhone & Android
See how guided diagnosis works →