Carrier 38MGRBQ18B-3 Service Manual page 26

38MGRBQ: Service Manual
Diagnostic Guides
DISPLAY
Communication malfunction between indoor and outdoor units
EL01
FL14 Incapability between indoor and outdoor units
EC50 Outdoor temperature sensor
Outdoor EEPROM error
EC51
Condenser coil temperature sensor (T3) malfunction
EC52
Outdoor ambient temperature sensor (T4) malfunction
EC53
EC54 Compressor discharge temperature sensor TP is in an open circuit or has short circuited
EC55 Outdoor IPM module temperature sensor malfunction
Outdoor T2B sensor error
EC56
Refrigerant pipe temperature sensor error
EC57
Outdoor DC fan motor malfunction speed out of control
EC07
EC71 Over current failure of outdoor DC fan motor
EC72 Lack phase failure of outdoor DC fan motor
Inverter module (IPM) protection
PC00
Top temperature protection of compressor
PC02
PC06 Discharge temperature protection of compressor
PC08 Outdoor overcurrent protection
High temperature protection of condenser
PC0A
PFC module protection
PC0F
Low temperature outdoor unit protection
PC0L
PC10 Outdoor unit low AC voltage protection
PC11 Outdoor unit low AC voltage protection
Outdoor unit main control board DC bus high voltage protection /341 MCE error
PC12
System high pressure protection
PC30
System low pressure protection
PC31
PC40 Communication error between the outdoor main chip and the compressor driven chip
PC42 Compressor start failure of the outdoor unit
Outdoor compressor lack phase protection
PC43
Outdoor unit zero speed protection
PC44
Outdoor unit IR chip drive failure
PC45
PC46 Compressor speed is out of control
PC49 Compressor overcurrent failure
Condensation protection of the refrigerant pipe
PCA1
High temperature protection of the evaporator
PH90
Low temperature protection of the evaporator
PH91
LC06 High temperature protection of inverter module (IPM)
NOTE: If displays DF or FC, it is a normal operation, not a malfunction.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 23 — Outdoor Unit Error Display
MALFUNCTION AND PROTECTION INDICATION
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