What It Means
- SECONDARY HEAT 2 LIMIT OPEN S100
Lennox Unit controller
Lennox Error Code 62
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 62
Heat section 2 secondary heat limit switch is open. Check air flow, limit switch and wiring.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
SECONDARY HEAT 2 LIMIT OPEN S100
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.
