Mitsubishi SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit LA Error Fix: Power Transistor (IGBT) Abnormality

Error code LA on the Mitsubishi SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit means: Power Transistor (IGBT) Abnormality. The inverter power transistor (IGBT — Insulated Gate Bipolar Transistor) in the outdoor unit has failed or is operating abnormally. The IGBT is the main switching element that converts DC bus voltage to variable-frequency AC for the compressor motor. Causes: age-related degradation, power surges, sustained overcurrent conditions, heat damage. The inverter board or IPM module requires replacement. This is one of the most expensive outdoor unit repairs.

The most successful fix is "Replace the Outdoor Unit Inverter Board (IPM Module)" (hard difficulty, ~120 minutes). This fix costs nothing. 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 ("Replace the Outdoor Unit Inverter Board (IPM Module)") is rated hard difficulty and takes about 120 minutes. Tools needed: T20 Torx screwdriver, Insulated gloves, Labeling tape.

DIY cost: $0. Professional repair typically costs $600-$900. Many homeowners save money by trying the top-ranked community fix first.

The Mitsubishi SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit has 8 other known error codes, including: F1 (Reverse Phase / Phase Loss Detection), F3 (Compressor Discharge Temperature Protection), F4 (Outdoor Heat Exchanger Thermistor Error), F5 (Compressor Overheating / High Pressure Switch Activation), F6 (Outdoor Subcooling Sensor / Pipe Thermistor Error), and 3 more.

Error code LA also appears on 5 other Mitsubishi models: MUZ-GL09NA 9,000 BTU Single-Zone Outdoor Unit, MXZ-3C30NAHZ 30,000 BTU 3-Zone Hyper-Heat Multi-Zone Outdoor Unit, MXZ-4C36NAHZ 36,000 BTU 4-Zone Hyper-Heat Multi-Zone Outdoor Unit, PUZ-A18NKA 18,000 BTU P-Series Ducted Heat Pump Outdoor Unit, PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit. The fix may vary by model, so check each model's specific page for tailored repair steps.