What It Means
- Control self-check OKAY? NO branch. Control board failure. Lockout main valve OFF, combustion air and system fans ON; reset thermostat.
Lennox Ducted Heating
Lennox Ducted Heating Error Code Steady on
Ducted Heating:
Causes & actions from Lennox
How it shows
- ram diagnostic led: Steady on
Control board failure / self-check failed. Lockout: main valve off, combustion air and system fans on.
Applicable models & manual sources
- G24M
Control self-check OKAY? NO branch. Control board failure. Lockout main valve OFF, combustion air and system fans ON; reset thermostat.
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.
