What It Means
- HIGH PRESSURE SWITCH - COMPRESSOR 3
Lennox Unit controller
Lennox Unit controller Error Code 16
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 16
• Compressor is off. Check charge, fans and coil. • The CORE Unit Controller will clear high pressure switch alarm when corresponding high pressure switch is detected as closed. Compressor will not be restarted until corresponding high pressure switch is closed and Minimum Off Delay (cooling or heating) has expired.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
HIGH PRESSURE SWITCH - COMPRESSOR 3
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.
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