What It Means
- CBX40UHV: Compressor rotor locked.
- 3WPD036S6S-1P: System stops due to overload protection control
Lennox Split & Multi-Split
Lennox Split & Multi-Split Error Code E404
Split & Multi-Split
E404 means different things on different Split & Multi-Split models. Enter your model number to see only your reading, or find your model below.
Causes & actions from Lennox
Compressor rotor locked.
Models: CBX40UHV
Air handler (indoor)
How it shows
- Single-character display: E404
This manual entry does not list further causes or actions.
Applicable models & manual sources
- CBX40UHV
Compressor rotor locked.
System stops due to overload protection control
Models: 3WPD036S6S-1P
Mini-split unit (outdoor)
How it shows
- mini outdoor inverter pcb: E404
- Mini-split outdoor main board: E404
Check Comp. when it starts
Applicable models & manual sources
- 3WPD036S6S-1P
System stops due to overload protection control
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.
