45MBCAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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TROUBLESHOOTING
For ease of service, the systems are equipped with diagnostic code display LEDs on both the indoor and outdoor units. The outdoor diagnostic display
consists of two LEDs (Red and Green) on the outdoor unit board and is limited to a few errors.
The indoor diagnostic display is a combination of flashing LEDs on the display panel or the front of the unit. If possible, always check the diagnostic
codes displayed on the indoor unit first.
The diagnostic codes displayed on the indoor unit are listed in Table 8.
INDOOR UNIT DIAGNOSTIC GUIDES
Table 6 — Error Codes
If you receive one of the codes above, call a technician as soon as possible. No need to panic, the unit goes into TURBO mode until the error code is
cleared. There is a “beep” noise coming from the indoor unit, which is normal in this case.
For additional diagnostic information, refer to the Service Manual.
Display Malfunction and Protection Indication Display Malfunction and Protection Indication
EL01 IDU and ODU Communication Error PC08 ODL Current Protection
EC07 Outdoor DC fan motor speed out of control PC10 ODL AC voltage too low protection
EC51 ODU EEPROM error PC11 ODL DC bus voltage too high protection
EC52 Condenser coil temperature sensor (T3) error PC12 ODL DC bus voltage too low protection
EC53 ODU temperature sensor (T4) error PC30 System pressure overload protection
EC54 ODU exhaust temperature sensor error PC31 System pressure too low protection
EC55 ODU IPM module temperature sensor error PC40
Communication failure between outdoor main control chip
and the driver chip
EC56 ODU T2B sensor PC41 Compressor current sampling circuit failure
EH00 IDU EEPROM error PC42 Compressor starting failure
EH0A Indoor EEPROM Parameter error PC43 Compressor lost phrase protection
EHC1 Refrigerant Sensor detects a leak PC44 Compressor zero speed protection
EHC2
Working condition of the refrigerant sensor is out of range and
a leak is detected
PC45 Voltage drop
EHC3 Working condition of the refrigerant sensor is out of range PC46 Compressor speed out of control
EH02 Zero-crossing signal detection error PC49 Compressor over current error
EH03 Indoor fan motor speed is out of control PC0A Condenser high temperature protection
EH31 Protection for low DC bus voltage of the external fan PC0F PFC failure
EH32 Protection for high DC bus voltage of the external fan PC0L Outdoor low temperature protection
EH60 IDU ENV temperature T1 sensor error PH09 IDU anti-cold wind stop machine
EH61 IDU pipe temperature T2 sensor error PH90 Evaporator high temperature protection
EH0b IDU PCB and display communication error PH91 Evaporator low temperature protection
FH0C Indoor Unit humidity sensor malfunction LC01 Condenser high temperature frequency limited (L1)
FHCC Refrigerant Sensor Error LC02
Compressor Discharge Pipe High temperature frequency
limited (L2)
EL01 IDU and ODU Communication Error LC03 Current frequency limited (L3)
EL0C System leaks refrigerant LC05 Voltage frequency limited (L5)
FH0P Wireless Module Self-Test Failure LC06 IPM module temperature frequency limited
FL09 New and old platform mismatch failure LH00 Evaporator temperature frequency limited (L0)
PC00 ODU IPM Protection
LH07 Remote Control frequency limitation in effect
PC01 ODU Voltage Protection
PC02
Compressor top temperature (IPM module temperature
protection)
--- Mode conflict fault
nA No fault or protection
PC03 System Pressure Protection
FHCC Refrigerant Sensor Error
ECC1 Other indoor unit refrigerant sensor detects a leak (multi-zone)
EL0C System Leaks Refrigerant
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