What It Means
- Ignition lockout from too many trials.
- Pressure Switch open with CAI ON
Lennox Packaged Unit
Lennox Packaged Unit Error Code 3 Flashes
Packaged Unit
3 Flashes means different things on different Packaged Unit models. Enter your model number to see only your reading, or find your model below.
Causes & actions from Lennox
Ignition lockout from too many trials.
8 models
LGM036, LGM048, LGM060, LGM074, LGT036, LGT048, LGT060, LGT072
Packaged HVAC (indoor)
How it shows
- dsi ignition heartbeat led: 3 Flashes
This manual entry does not list further causes or actions.
Applicable models & manual sources
- LGM036
Ignition lockout from too many trials.
LGM036, LGM048, LGM060, LGM074
- LGT036
Ignition lockout from too many trials.
LGT036, LGT048, LGT060, LGT072
Pressure Switch open with CAI ON
10 models
LDT078, LDT092, LDT102, LDT120, LDT152, LGM156U, LGM180U, LGM210U, LGM240U, LGM300U
Packaged HVAC (outdoor)
How it shows
- dsi ignition heartbeat led: 3 Flashes
This manual entry does not list further causes or actions.
Applicable models & manual sources
- LDT078
Pressure Switch open with CAI ON
LDT078, LDT092, LDT102, LDT120, LDT152
- LGM156U
Pressure Switch open with CAI ON
LGM156U, LGM180U, LGM210U, LGM240U, LGM300U
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.
