What It Means
- AH EIM Defrost Out Of Cycle
Lennox Equipment not specified
Lennox Error Code 420
Equipment not specified:
Causes & actions from Lennox
How it shows
- iComfort S30 alert: 420
Priority condition: Service Soon The heat pump defrost cycle has taken more than 20 minutes to complete. • Defrost cycle lasts longer than 20 minutes. • Check heat pump operation. • This is applicable only in communicating indoor unit with non-communicating heat pump.
Applicable models & manual sources
- iComfort S30
AH EIM Defrost Out Of Cycle
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.
