A compressor that runs continuously without ever cycling off (F8) is working overtime to compensate for lost cooling efficiency somewhere in the system — a refrigerant leak, a failing compressor itself, or a restricted condenser coil or fan are the usual causes. Left unaddressed, that continuous operation accelerates wear on a compressor that’s already struggling, on top of the higher energy use.
Diagnosing which of those three is actually responsible requires specialized equipment, particularly for refrigerant leak detection, so this isn’t a problem to troubleshoot by ear alone — a technician confirms the specific cause before recommending a repair.