Mitsubishi SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit PA Error Fix: Forced Compressor Stop from Indoor Unit

Error code PA on the Mitsubishi SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit means: Forced Compressor Stop from Indoor Unit. The indoor unit is commanding the compressor to stop due to an abnormal condition detected at the indoor side. This is typically triggered when the indoor coil pressure or temperature indicates excessively high or low refrigerant pressure. Can also be triggered by a combination of sensor readings that indicate a refrigerant circuit problem. Investigate underlying causes — often a symptom of low refrigerant charge, restriction, or blocked airflow.

The most successful fix is "Check Refrigerant Pressure and Replace Indoor Coil Pressure Sensor" (hard difficulty, ~120 minutes). Estimated DIY cost: $0-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated critical severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Check Refrigerant Pressure and Replace Indoor Coil Pressure Sensor") is rated hard difficulty and takes about 120 minutes. Tools needed: Digital manifold gauge set, Multimeter, Phillips screwdriver, Nut driver set.

DIY cost: $0-$20. Professional repair typically costs $200-$350. Many homeowners save money by trying the top-ranked community fix first.

The Mitsubishi SLZ-KF09NA 9,000 BTU 4-Way Ceiling Cassette Indoor Unit has 8 other known error codes, including: E1 (Remote Controller PCB Error), E2 (Remote Controller Signal Receiving Error), E3 (Remote Controller Communication Error), E4 (Indoor Unit PCB Processor Error), E5 (Indoor/Outdoor Communication Error (Legacy)), and 3 more.

Error code PA also appears on 8 other Mitsubishi models: MLZ-KP09NA 9,000 BTU One-Way Ceiling Cassette Indoor Unit, MSZ-EF15NA 15,000 BTU Designer Series (Kirigamine Zen) Wall-Mount Indoor Unit, MSZ-FH12NA 12,000 BTU Hyper-Heat H2i Wall-Mount Indoor Unit, MSZ-FS06NA 6,000 BTU Compact Wall-Mount Indoor Unit, MSZ-GL09NA 9,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit, MSZ-GL12NA 12,000 BTU Wall-Mount Ductless Mini-Split Indoor Unit, and 2 more. The fix may vary by model, so check each model's specific page for tailored repair steps.