Carrier 40GXQ, 38GXQ Troubleshooting, 38GXC/GXQ 40GXC/GXQ 009-024 Diagnostic Codes

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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

 

 

LED Display on Outdoor Unit Board

 

 

Code Displayed

 

 

 

 

Equipment Fault

Green

Red

Yellow

Possible Cause

on Indoor Unit

LED

LED

LED

 

Front Panel

Number

Number

Number

 

 

 

of Flashes

of Flashes

of Flashes

 

 

 

 

 

 

 

Freeze Protection, Indoor Coil

E2

 

4

3

Low Refrigerant Charge, Blocked Indoor Air

 

Flow, or Dirty Air Filter

 

 

 

 

 

 

 

 

 

 

 

High Compressor Discharge Temperature

E4

 

 

7

Low Refrigerant Charge, Blocked Capillary,

 

 

or High Ambient Temperature

 

 

 

 

 

 

 

 

 

 

 

Low Voltage Protection

E5

 

 

5

Low Voltage

 

 

 

 

 

 

Communication Error

E6

0

 

 

Wiring Error, or Communication Failure

 

 

 

 

 

 

Indoor Air Temperature Thermistor

F1

 

 

 

Bad Connection, or Sensor Failure

 

 

 

 

 

 

Indoor Coil Temperature Thermistor

F2

 

 

 

Bad Connection, or Sensor Failure

 

 

 

 

 

 

Outdoor Air Temperature Thermistor

F3

 

6

 

Bad Connection, or Sensor Failure

 

 

 

 

 

 

Outdoor Coil Temperature Thermistor

F4

 

5

 

Bad Connection, or Sensor Failure

 

 

 

 

 

 

Compressor Discharge Line Thermistor

F5

 

7

 

Bad Connection, or Sensor Failure

 

 

 

 

 

 

Defrost

H1

 

 

2

Unit going through normal defrost cycle

 

 

 

 

 

 

Compressor Overload Protection

H3

 

 

8

Low Refrigerant Charge, Blocked Capillary,

 

 

or Compressor Motor Failure

 

 

 

 

 

 

 

 

 

 

 

Compressor Over Current Protection

H4

 

 

6

High Ambient Temperature, or Loss of

 

 

Condenser Airflow

 

 

 

 

 

 

 

 

 

 

 

IPM Module Protection

H5

 

 

4

Loss of Cooling to Heat Sink, High Ambient,

 

 

Low Voltage, or Bad Connections

 

 

 

 

 

 

 

 

 

 

 

38/40GXC(Q)

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Contents Table of Contents Installation Instructions38GXCQ / 40GXCQ 009, 012, 018 and 024 Parts List Parts ListSystem Requirements Safety ConsiderationsConnecting Power and Control Cable GeneralDimensions Outdoor Dimensions IndoorClearances Outdoor Clearances IndoorInstall Mounting Plate Installation GuideIndoor Unit Installation If piping is going through the right or left side Outdoor Unit InstallationField Wiring System Vacuum and Charge Using Vacuum PumpOutdoor Unit START-UPSystem Checks Indoor Unit38GXC/GXQ 40GXC/GXQ 009-024 Diagnostic Codes TroubleshootingCatalog No 40GX---4SI

38GXC, 38GXQ, 40GXC, 40GXQ specifications

Carrier's 40GXQ, 38GXQ, 38GXC, and 40GXC series are a testament to the brand’s commitment to innovation and excellence in HVAC technology. These units are designed to meet the diverse needs of commercial and residential applications while ensuring optimal performance, energy efficiency, and sustainability.

The 40GXQ model stands out for its advanced cooling capabilities and high efficiency. This rooftop unit employs a high-efficiency scroll compressor that enhances performance while minimizing energy consumption. With a cooling capacity ranging from 3 to 20 tons, the 40GXQ is ideal for larger spaces requiring significant cooling load management. It also features a user-friendly interface, allowing for easy adjustments and monitoring through a digital display.

The 38GXQ is particularly notable for its versatility and robust design. Featuring an integrated economizer, the 38GXQ allows for enhanced energy savings by leveraging outdoor air for free cooling when conditions permit. This model is equipped with high-efficiency filters that improve indoor air quality, making it suitable for applications in schools, offices, and healthcare facilities.

The 38GXC variant is designed for residential applications and emphasizes whisper-quiet operation without compromising performance. Its high SEER (Seasonal Energy Efficiency Ratio) rating means homeowners can enjoy substantial savings on their energy bills. The 38GXC is also equipped with Carrier's Greenspeed intelligence, which enables the system to modulate its output, maintaining comfort levels while reducing energy consumption.

The 40GXC model represents innovation in temperature control systems. With its sleek design and advanced variable-speed compressor, the 40GXC can adapt to changing conditions while maintaining efficiency and performance. This model also incorporates advanced monitoring systems that provide real-time data on performance and diagnostics, ensuring optimum efficiency throughout its lifecycle.

All these Carrier models are equipped with advanced refrigerant management systems, supporting environmentally friendly refrigerants that adhere to current environmental regulations. They not only provide effective cooling solutions but also contribute to a sustainable future, aligning with Carrier’s broader commitment to reducing carbon footprints.

In summary, the Carrier 40GXQ, 38GXQ, 38GXC, and 40GXC are engineered to deliver exceptional performance, energy efficiency, and versatility across various applications. With advanced technologies and a commitment to sustainability, these units set a high standard in the HVAC industry. Whether for commercial or residential use, these models provide reliable and efficient climate control solutions.