Troubleshooting - Carrier 38GXC Installation Instructions Manual

This unit has onboard diagnostics. Error codes will appear on the LED display on the front panel of the indoor unit in place of the
temperature display. Error codes are also displayed on the outdoor unit microprocessor board with colored LED lights. The table below
explains the error codes for both units.
Equipment Fault
Freeze Protection, Indoor Coil
High Compressor Discharge Temperature
Low Voltage Protection
Communication Error
Indoor Air Temperature Thermistor
Indoor Coil Temperature Thermistor
Outdoor Air Temperature Thermistor
Outdoor Coil Temperature Thermistor
Compressor Discharge Line Thermistor
Defrost
Compressor Overload Protection
Compressor Over Current Protection
IPM Module Protection

TROUBLESHOOTING

38GXC/GXQ - - 40GXC/GXQ 009- -024 Diagnostic Codes
LED Display on Outdoor Unit Board
Code Displayed
Green
on Indoor Unit
LED
Front Panel
Number
of Flashes
E2
E4
E5
E6 0
F1
F2
F3
F4
F5
H1
H3
H4
H5
Red Yellow
LED LED
Number Number
of Flashes of Flashes
Low Refrigerant Charge, Blocked Indoor Air
4 3
Flow, or Dirty Air Filter
Low Refrigerant Charge, Blocked Capillary,
7
or High Ambient Temperature
5 Low Voltage
Wiring Error, or Communication Failure
Bad Connection, or Sensor Failure
Bad Connection, or Sensor Failure
6 Bad Connection, or Sensor Failure
5 Bad Connection, or Sensor Failure
7 Bad Connection, or Sensor Failure
2 Unit going through normal defrost cycle
Low Refrigerant Charge, Blocked Capillary,
8
or Compressor Motor Failure
High Ambient Temperature, or Loss of
6
Condenser Airflow
Loss of Cooling to Heat Sink, High Ambient,
4
Low Voltage, or Bad Connections
11
Possible Cause