Many higher-end Liebherr refrigerators use two independent compressors — one for the main fridge compartment, one for the freezer or BioFresh zone — so that each section can be cooled and controlled without affecting the other. Understanding this matters when diagnosing a unit that seems to run non-stop.
Some Constant Running Is Normal
A freezer compressor cycling more than the fridge compressor isn’t necessarily a fault — the two zones have different workloads and different target temperatures, and they’re not meant to cycle in sync.
When It’s Actually a Problem
If one compressor is running continuously and the compartment it serves still isn’t reaching its target temperature, that’s the real warning sign — not the running itself, but running without the payoff of actually getting cold. That combination usually points to a refrigerant charge issue, a failing compressor, or a blocked condenser restricting heat dissipation.
Check the Easy Things First
Confirm the unit has adequate clearance for airflow around its condenser, and that SuperFrost or SuperCool wasn’t left engaged from a recent grocery run — both are designed to run the compressor harder temporarily.
If constant running comes with a compartment that’s still not reaching temperature, book a diagnostic — sealed-system work needs an EPA-certified technician.