Mitsubishi MSZ-FH12NA 12,000 BTU Hyper-Heat H2i Wall-Mount Indoor Unit P2 Error Fix: Indoor Pipe/Coil Temperature Sensor Error

Error code P2 on the Mitsubishi MSZ-FH12NA 12,000 BTU Hyper-Heat H2i Wall-Mount Indoor Unit means: Indoor Pipe/Coil Temperature Sensor Error. The indoor heat exchanger (evaporator/condenser coil) temperature thermistor (TC1 sensor) has failed. This sensor monitors the coil temperature to prevent freezing in cooling mode and overheating in heating mode. The indoor LED blinks 2 times with this fault. The thermistor is clipped or taped to the indoor coil. Check for a loose connection, damaged wire, or corroded connector. Measure resistance — approximately 10K ohms at 25C. A failed TC1 sensor will cause the system to shut down to prevent coil damage.

The most successful fix is "Test and Replace Indoor Coil Temperature Thermistor Sensor" (medium difficulty, ~60 minutes). Estimated DIY cost: $15-$25. 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 ("Test and Replace Indoor Coil Temperature Thermistor Sensor") is rated medium difficulty and takes about 60 minutes. Tools needed: Phillips screwdriver, Digital multimeter, Electrical tape.

DIY cost: $15-$25. Professional repair typically costs $130-$200. Many homeowners save money by trying the top-ranked community fix first.

The Mitsubishi MSZ-FH12NA 12,000 BTU Hyper-Heat H2i Wall-Mount 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 P2 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-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, SEZ-KD12NA 12,000 BTU Ceiling-Concealed Ducted Indoor Unit, and 2 more. The fix may vary by model, so check each model's specific page for tailored repair steps.