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Error code reference

Goodman Air Conditioner Error Code LC

Outdoor Coil Thermistor temperature high.

Goodman codesGoodman air conditioner codes

Outdoor Coil Thermistor temperature high.

First step from the service manual

Clean Condenser Coils, Check Fan for fault. Code will reset after cleaning.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What LC means on a Goodman air conditioner

The LC error code on a Goodman air conditioner indicates that the outdoor coil thermistor has detected an abnormally high temperature at the condenser coil. The outdoor coil thermistor is a temperature-sensing resistor mounted on the condenser coil that continuously monitors coil temperature and reports that data to the control board. When the thermistor reading exceeds the acceptable threshold, the system triggers the LC fault to protect the compressor and refrigerant circuit from operating under dangerously high-heat conditions.

The most common cause of this fault is restricted airflow across the condenser coil due to dirt, debris, grass clippings, or cottonwood buildup on the coil fins. When the coil surface becomes blocked, heat cannot dissipate efficiently from the refrigerant to the outdoor air, causing coil temperature to spike rapidly. A failed or underperforming condenser fan motor is the other primary cause, since the fan is responsible for drawing ambient air through the coil to carry away heat.

In many cases, this code will reset automatically once the underlying condition is corrected. Cleaning the condenser coils thoroughly and confirming the condenser fan is spinning at the correct speed and direction are the first required steps. If the coils are clean and the fan is operating properly but the LC code persists, the thermistor itself may have drifted out of calibration or failed, and its resistance values should be tested against specification.

Source: manufacturer service documentation.

Common causes of LC

  1. 01

    Dirty or Blocked Condenser Coils

    Wiring / connection

    Accumulated dirt, debris, or biological growth on the condenser coil fins restricts airflow and traps heat at the coil surface. Visually inspect the coil fins for buildup and clean with coil cleaner and water rinse.

  2. 02

    Condenser Fan Motor Failure or Reduced Speed

    Part replacement

    If the condenser fan motor is failing, seized, or spinning in the wrong direction, airflow through the coil drops and coil temperature rises quickly. Check that the fan blade spins freely, runs at full speed, and moves air upward through the top of the unit.

  3. 03

    Blocked Airflow Around the Outdoor Unit

    Wiring / connection

    Vegetation, fencing, stored objects, or debris placed too close to the unit can restrict the intake or discharge airflow path. Ensure at least 18 to 24 inches of clearance on all sides and that the top discharge is unobstructed.

  4. 04

    Faulty Outdoor Coil Thermistor

    Part replacement

    If the thermistor has drifted out of calibration or has an internal fault, it may report falsely elevated temperature readings to the control board. Test the thermistor resistance and compare against the rated specification to confirm accuracy.

  5. 05

    Low Refrigerant Charge

    Part replacement

    An undercharged refrigerant circuit can cause elevated coil temperatures as the system struggles to transfer heat properly. This requires pressure testing by a certified technician to diagnose and correct.

See the test procedure for each cause

Frequently asked questions about LC

What does LC mean on a Goodman air_conditioner?
The LC code means the outdoor coil thermistor has detected a high temperature at the condenser coil. This is a protective fault that prevents the system from running under conditions that could damage the compressor. It is most often triggered by dirty condenser coils or a condenser fan problem. The code will reset after the underlying cause is corrected.
How do I fix the LC error code on my Goodman air conditioner?
Start by turning off the unit and cleaning the condenser coils using a coil cleaner and a gentle water rinse to remove dirt and debris from the fins. Then confirm the condenser fan spins freely, runs when the system is powered, and moves air upward out of the top of the unit. If the coils are clean and the fan is working correctly but the code returns, have a technician test the outdoor coil thermistor and check refrigerant pressure.
Will the LC code on my Goodman unit reset on its own?
Yes, according to Goodman diagnostic information, the LC code is designed to reset automatically after the cause of the high coil temperature is addressed. Simply cleaning the condenser coils and confirming the fan is operating correctly is typically enough to allow the system to reset and resume normal operation. If the code returns after cleaning, a deeper fault such as a failed thermistor or low refrigerant charge needs investigation.
Is it safe to keep running my Goodman air conditioner with an LC error code?
No, you should not continue operating the system while the LC fault is active. The code exists to protect the compressor and refrigerant components from heat-related damage. Running the system through repeated fault cycles without addressing the cause can lead to compressor failure, which is a much more expensive repair than fixing the original problem.
How much does it cost to repair a Goodman air conditioner with an LC fault code?
If the fix is a coil cleaning, costs are generally in the range of $75 to $200 for a professional service call and cleaning. A condenser fan motor replacement typically runs between $150 and $400 depending on the motor and labor rates in your area. If the outdoor coil thermistor needs replacement, parts and labor usually fall in the $100 to $250 range. Refrigerant-related repairs vary widely based on the refrigerant type and the extent of any leak.

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