38MURA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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OUTDOOR UNIT DIAGNOSTIC GUIDES
For ease of service, systems are equipped with diagnostic code display LEDs on the indoor and outdoor units. Outdoor diagnostic is displayed on the
outdoor unit microprocessor board. There may be a few error codes displayed in the indoor unit that might relate to the outdoor unit's problems. If
possible, always check the diagnostic codes displayed on the indoor unit first. The diagnostic codes displayed on the outdoor units are listed in
Table 11.
Table 11 — Outdoor Unit Diagnostic Codes
NOTE: It is normal to display DF or FC, not a malfunction. For additional diagnostic information, refer to the service manual.
DISPLAY ERROR INFORMATION DISPLAY ERROR INFORMATION
EC5C High pressure sensor failure PC0F PFC module protection
EC57 Refrigerant pipe temperature sensor error PC0L Low temperature protection of outdoor unit
EL01
Communication malfunction between indoor and outdoor
units
PC10 Outdoor unit low AC voltage protection
EC50 Outdoor temperature sensor error PC11
Outdoor unit main control board DC bus high voltage
protection
EC51 Outdoor EEPROM error PC12
Outdoor unit main control board DC bus high voltage
protection /341 MCE error
EC52 Condenser coil temperature sensor (T3) malfunction PC30 System high pressure protection
EC53 Outdoor ambient temperature sensor (T4) malfunction PC31 System low pressure protection
EC54
Compressor discharge temperature sensor TP has an
open or short circuit
PC40
Communication error between outdoor main chip and
compressor driven chip
EC07
Outdoor DC fan motor malfunction/fan speed out of
control
PC42 Compressor start failure of outdoor unit
EC71 Over current failure of outdoor DC fan motor PC43 Outdoor compressor lack phase protection
EC72 Lack phase failure of outdoor DC fan motor PC44 Outdoor unit zero speed protection
EL16
Communication malfunction between outdoor unit main
board and outdoor transit board
PC45 Outdoor unit IR chip drive failure
PC00 Inverter module (IPM) protection PC46 Compressor speed has been out of control
PC02 Top temperature protection of compressor PC49 Compressor overcurrent failure
PC06 Discharge temperature protection of compressor PH90 High temperature protection of Evaporator
PC08 Outdoor overcurrent protection PH91 Low temperature protection of Evaporator
PC0A High temperature protection of condenser LC06 High temperature protection of Inverter module (IPM)
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