What It Means
- DRAIN PAN OVERFLOW SWITCH
Lennox Unit controller
Lennox Unit controller Error Code 30
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 30
• Check for block drain, condensate lines and drain pan overflow switch. • Alarm set if overflow switch is detected opened and compressor will be locked out. System will automatically clear alarm once switch is detected closed. System will resume operation (compressor lockout), after the Error Timed OFF Delay has expired following the Overflow switch alarm clear.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
DRAIN PAN OVERFLOW SWITCH
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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