Mitsubishi PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit LC Error Fix: Outdoor Unit EEPROM / Address Error

Error code LC on the Mitsubishi PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump Outdoor Unit means: Outdoor Unit EEPROM / Address Error. The address EEPROM or data EEPROM on the outdoor unit PCB is corrupted or unreadable. In multi-zone systems, the outdoor unit EEPROM stores the address mapping for connected indoor units. Corruption can cause the outdoor unit to lose track of which indoor units are connected. Try resetting power. If LC persists, the outdoor PCB may need replacement or EEPROM reflashing with Mitsubishi service tools.

The most successful fix is "Replace or Reflash Outdoor Unit PCB to Fix EEPROM Corruption" (hard difficulty, ~90 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 or Reflash Outdoor Unit PCB to Fix EEPROM Corruption") is rated hard difficulty and takes about 90 minutes. Tools needed: Phillips screwdriver, ESD wrist strap, Mitsubishi service tool interface (for reflashing).

DIY cost: $0. Professional repair typically costs $350-$600. Many homeowners save money by trying the top-ranked community fix first.

The Mitsubishi PUZ-HA36NKA5 36,000 BTU Zuba Central Cold-Climate Heat Pump 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 LC 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, SUZ-KA09NA 9,000 BTU Concealed Duct System Outdoor Unit. The fix may vary by model, so check each model's specific page for tailored repair steps.