What It Means
- Error on ESC IN temperature sensor (Short or Open)
Lennox Split & Multi-Split
Lennox Error Code E321
Split & Multi-Split: Mini-split unit (outdoor)
Causes & actions from Lennox
How it shows
- mini outdoor inverter pcb: E321
- Mini-split outdoor main board: E321
Check ESC IN sensor Open / Short
Applicable models & manual sources
- 3WPD036S6S-1P
Error on ESC IN temperature sensor (Short or Open)
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?
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