Unit displays F0 and does not cool effectively; may stop after short operation.

Safety first: Do not attempt to cut or open refrigerant lines yourself. Refrigerant is under pressure and requires certified handling.

Steps:

• Visual inspection: Look for oil stains on flare joints, service valves, and around the indoor and outdoor coils. Oil residue often indicates a refrigerant leak.
• Check flare nuts: With power off, gently check that flare nuts at the outdoor service valves and indoor connections are snug (do not overtighten).
• Listen for hissing: In a quiet environment, listen near joints for any hissing sound that might indicate an active leak.
• Professional leak test: A Blaupunkt-authorized technician should perform a nitrogen pressure test and electronic leak detection, repair the leak, evacuate, and recharge the system to the exact factory charge.

Note: Simply adding refrigerant without fixing the leak will cause the F0 fault to return and can damage the compressor.