What It Means
- DSI BOARD 2 LOCKOUT
Lennox Unit controller
Lennox Error Code 243
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 243
Direct Spark Ignition board 2 valve fault detected and is locked out. Multiple failures has occurred. Resolve ignition issues and restart unit. M4 will lock out gas valve 2 operation.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
DSI BOARD 2 LOCKOUT
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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