What It Means
- When in icomfort mode with non-communicating HP, defrost cycle running greater than 20 minutes in duration.
Lennox Split & Multi-Split
Lennox Error Code E420
Split & Multi-Split: Air handler (indoor)
Causes & actions from Lennox
How it shows
- Single-character display: E420
This manual entry does not list further causes or actions.
Applicable models & manual sources
- CBX40UHV
When in icomfort mode with non−communicating HP, defrost cycle running greater than 20 minutes in duration.
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.
