What It Means
- EIM Interlock Relay Stuck
Lennox Equipment not specified
Lennox Error Code 381
Equipment not specified:
Causes & actions from Lennox
How it shows
- iComfort S30 alert: 381
Priority condition: Service Urgent Interlock relay stuck (furnace or air handler modes only). • Interlock relay continuously sensed (with relay off). • There is no heating and cooling operation – moderation condition. • After 10 minutes if event still exist it will be escalated to priority condition service urgent.
Applicable models & manual sources
- iComfort S30
EIM Interlock Relay Stuck
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.
