What It Means
- External Contact Input ERROR
Lennox Split & Multi-Split
Lennox Split & Multi-Split Error Code E665
Split & Multi-Split: Mini-split unit (outdoor)
Causes & actions from Lennox
How it shows
- mini outdoor inverter pcb: E665
- Mini-split outdoor main board: E665
1. C heck the External float switch connection. 2. C heck whether the drain has been filled with water. 3. C heck the emergency alarm system (Emergency Stop)
Applicable models & manual sources
- 3WPD036S6S-1P
External Contact Input ERROR
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.
