What It Means
- LOW PRESSURE SWITCH COMPRESSOR 4
Lennox Unit controller
Lennox Error Code 28
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 28
Compressor if off. Check charge, fans and coil.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
LOW PRESSURE SWITCH COMPRESSOR 4
MODEL L - M4 UNIT CONTROLLER, M4 Unit Controller
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.
