What It Means
- Delay up to 20 seconds
Lennox Unit controller
Lennox Error Code d020
Unit controller
Causes & actions from Lennox
How it shows
- m4 local 7segment: d020
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
Delay up to 20 seconds
MODEL L - M4 UNIT CONTROLLER, M4 Unit Controller
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.
