What It Means
- HB LED blinks while M4 is powered.
Lennox Packaged Unit
Lennox Error Code Blinking
Packaged Unit: Packaged HVAC (outdoor)
Causes & actions from Lennox
How it shows
- core unit heartbeat led: Blinking
Heartbeat LED blinks while M4 is powered
Other manual wording (1 of 2)
LCT156H, LCT180H, LCT210H, LCT240H, LCT300H, LGT156H, LGT180H, LGT210H, LGT240H, LGT300H
Heartbeat LED (HB LED) blinks while M4 Unit Controller is powered.
Other manual wording (2 of 2)
LHX092, LHX102, LHX120
This manual entry does not list further causes or actions.
Applicable models & manual sources
- LCM156U
HB LED blinks while M4 is powered.
LCM156U, LCM180U, LCM210U, LCM240U, LCM300U, LGM/LCM156U, LGM/LCM180U, LGM/LCM210U, LGM/LCM240U, LGM/LCM300U, LGM156U, LGM180U, LGM210U, LGM240U, LGM300U
- LGX092
HB LED blinks while M4 is powered.
LGX092, LGX102, LGX120, LGX150, LCX092, LCX102, LCX120, LCX150
- LGT156H
HB LED blinks while M4 is powered.
LGT156H, LGT180H, LGT210H, LGT240H, LGT300H, LCT156H, LCT180H, LCT210H, LCT240H, LCT300H
- LHX092
HB LED blinks while M4 is powered.
LHX092, LHX102, LHX120
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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