What It Means
- STRIKE 3 PRIMARY HEAT LIMIT OPEN
Lennox Unit controller
Lennox Error Code 61
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 61
Check heat section 2 primary burner limit switch to see if it is open. Check air flow, limit switch and wiring. Number of occurrences is reached.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
STRIKE 3 PRIMARY HEAT LIMIT OPEN
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.
