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Carrier 38MURAQ30AB3 troubleshooting and error codes

These codes are matched from manufacturer documentation to this model's series or control platform. Keep checks visible and safe; do not open electrical, refrigerant, gas, combustion, or sealed equipment compartments.

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Source-backed code set

32 matched codes

CodeMeaningSystem areaPriority
EC 51Outdoor EEPROM malfunctionOutdoor control boardUrgent
EL 01Indoor / outdoor units communication errorIndoor-outdoor communicationUrgent
EL 16Communication malfunction between adapter board and outdoor main boardControl communicationUrgent
PC 00IPM module protectionInverter moduleUrgent
PC 02Compressor top temperature or IPM high temperature protectionCompressor / inverter moduleUrgent
PC 06Compressor discharge temperature protectionCompressor dischargeUrgent
PC 08Outdoor overcurrent protectionOutdoor electrical protectionUrgent
PC 0AHigh temperature protection of condenserCondenser coilUrgent
PC 0FPFC module protectionPower-factor correction moduleUrgent
PC 10Outdoor unit low AC voltage protectionOutdoor power supplyUrgent
PC 11Outdoor main control board DC bus high voltage protectionOutdoor main control boardUrgent
PC 12Outdoor main control board DC bus high voltage protection / 341 MCE errorOutdoor main control boardUrgent
PC 30High pressure protectionRefrigerant pressureUrgent
PC 31Low pressure protectionRefrigerant pressureUrgent
PC 40Communication malfunction between IPM board and outdoor main boardInverter communicationUrgent
PC 41Outdoor compressor current sampling circuit failureCompressor current sensingUrgent
PC 43Outdoor compressor lack phase protectionCompressor phase protectionUrgent
PC 44Outdoor unit zero speed protectionOutdoor drive controlUrgent
PC 45Outdoor unit IR chip drive failureOutdoor drive controlUrgent
PC 46Compressor speed out of controlCompressor driveUrgent
PC 49Compressor overcurrent failureCompressor electrical protectionUrgent
EC 52Condenser coil temperature sensor T3 open circuit or short circuitTemperature sensorService
EC 53Outdoor room temperature sensor T4 open circuit or short circuitTemperature sensorService
EC 54Compressor discharge temperature sensor TP open circuit or short circuitTemperature sensorService
EC 57Refrigerant pipe temperature sensor errorTemperature sensorService
EC 5CHigh pressure sensor open circuit or short circuitPressure sensorUrgent
EC 71Outdoor DC fan motor overcurrent failureOutdoor fan motorUrgent
EC 72Outdoor DC fan motor lack phase failureOutdoor fan motorUrgent
EC 73Outdoor DC fan motor zero-speed failureOutdoor fan motorUrgent
EC 07Outdoor fan speed out of controlOutdoor fan motorUrgent
PC 0LLow ambient temperature protectionOutdoor operating conditionsService
LC 06High temperature protection of IPM moduleInverter moduleUrgent