What It Means
- PRIMARY HEAT 2 LIMIT OPEN S99
Lennox Unit controller
Lennox Error Code 60
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 60
Check heat section 2 primary burner limit switch to see if it is open. Check air flow, limit switch and wiring.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
PRIMARY HEAT 2 LIMIT OPEN S99
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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