Mitsubishi MSZ-FS06NA 6,000 BTU Compact Wall-Mount Indoor Unit P1 Error Fix: Intake Air Temperature Sensor Error

Error code P1 on the Mitsubishi MSZ-FS06NA 6,000 BTU Compact Wall-Mount Indoor Unit means: Intake Air Temperature Sensor Error. The room air intake temperature thermistor (TA sensor) on the indoor unit has failed — open circuit, short circuit, or reading out of range. This sensor measures the return air temperature entering the indoor unit and is critical for temperature regulation. The indoor LED blinks 1 time in a repeating pattern with this fault. Check the thermistor connector on the indoor PCB. Measure thermistor resistance — should be approximately 10K ohms at 25C (77F). Replace the thermistor if resistance is infinite (open) or near zero (short).

The most successful fix is "Test and Replace Intake Air Temperature Thermistor" (medium difficulty, ~45 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Test and Replace Intake Air Temperature Thermistor") is rated medium difficulty and takes about 45 minutes. Tools needed: Flathead screwdriver, Digital multimeter.

DIY cost: $10-$20. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The Mitsubishi MSZ-FS06NA 6,000 BTU Compact 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 P1 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-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.