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