Troubleshooting American Standard and Trane Furnace Error Codes

At Texas Pride HVAC, we know that your furnace is crucial for maintaining a comfortable home during the colder months. When your American Standard or Trane furnace encounters issues, it often communicates those problems through error codes. Understanding these error codes can help you identify furnace problems and estimate repair costs. Here’s a comprehensive guide to common American Standard and Trane furnace error codes

Locating the Furnace Error Code

All high-efficiency furnaces and most mid-efficiency furnaces display error codes on the control board. These codes are typically presented as a flashing LED sequence or on a digital display. To access the error code:

  • Find the Control Board: The control board is usually located inside the furnace. Refer to your furnace’s manual or consult our furnace glossary if you need help identifying furnace parts or terms.
  • Access the Inspection Port: Open the inspection port on your furnace, which provides access to the control board. Be cautious and follow safety guidelines while doing this.

Interpreting Furnace Error Codes

When troubleshooting your American Standard or Trane furnace, do not turn off the power unless instructed to do so. Turning off the power may clear the current error code, making it difficult to diagnose the issue. Instead, observe the flashing LED sequence or display code carefully, noting the sequence or digits.

Match the observed code with the corresponding information below:

  • LED Off: Indicates no power. Proceed to the Power diagnostic.
  • LED Flashing Slowly: Indicates normal operation with no call for heat. Refer to the Thermostat diagnostic.
  • LED Flashing Quickly: Indicates normal operation, with the furnace running or cycling. Continue to the Secondary diagnostic.
  • LED On (Not Flashing): Suggests a control board problem, potentially related to wiring, transformer issues, or a faulty control board. Professional diagnosis is necessary.
  • 2 Flashes: Signifies a lockout on retries. Continue to the Secondary diagnostic.
  • 3 Flashes: Indicates a pressure switch error. Proceed to the Secondary diagnostic.
  • 4 Flashes: Suggests an open limit switch. Refer to the Secondary diagnostic.
  • 5 Flashes: Implies flame sensed when the gas valve is off. This may be due to a faulty gas valve or control board. Professional diagnosis is required.
  • 6 Flashes: Points to incorrect line voltage polarity, potentially caused by wiring issues, transformer problems, or a faulty control board. Professional diagnosis is essential.
  • 7 Flashes: Indicates a gas valve circuit problem, possibly due to a faulty gas valve or control board. Seek professional diagnosis.
  • 8 Flashes: Suggests a low flame sensor, which may indicate a faulty flame sensor, igniter, or gas valve.
  • 9 Flashes: Indicates an igniter problem, possibly caused by a faulty igniter or gas valve.

For any American Standard or Trane furnace issues or error codes requiring professional assistance, reach out to Texas Pride HVAC. Our skilled technicians are dedicated to ensuring your furnace operates efficiently, keeping your home warm and cozy throughout the winter.

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