What It Means
- High pressure blockage error (Refrigerant completely Leakage error)
Lennox Air handler
Lennox Air handler Error Code 422
Air handler: Air handler (indoor)
Causes & actions from Lennox
How it shows
- Wired controller display: 422
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MMD***M6-1P
High pressure blockage error (Refrigerant completely Leakage error)
- MMD***S6-1P
High pressure blockage error (Refrigerant completely Leakage 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.
