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Error code reference

Goodman Air Conditioner Error Code C7

Indoor Freezing Lockout (ICT

Goodman codesGoodman air conditioner codes

Indoor Freezing Lockout (ICT - IAT > 20) + 10 minutes.

First step from the service manual

Clean filter, Check for fan and blower operation, Check for Refrigerant loss or Restricted capillary tube.

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

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What C7 means on a Goodman air conditioner

Error code C7 on a Goodman air conditioner indicates an Indoor Coil Freezing Lockout condition. The control board triggers this lockout when the difference between the Indoor Coil Temperature (ICT) and the Indoor Air Temperature (IAT) exceeds 20 degrees Fahrenheit for a sustained period of 10 minutes. This temperature differential measurement tells the board that the evaporator coil is getting significantly colder than the air passing over it, which is a reliable indicator of icing or imminent freeze-up. The system locks out to prevent compressor damage and protect the refrigerant circuit.

The root causes of this condition fall into two broad categories: airflow restriction and refrigerant system problems. On the airflow side, a clogged air filter is the most common culprit. When airflow across the evaporator coil is reduced, heat transfer from the return air to the refrigerant drops sharply, allowing the coil surface temperature to fall well below the freezing point of water. A failed blower motor or a blower wheel that is slipping on its shaft can produce the same result. Without adequate airflow, even a properly charged system will freeze the coil.

On the refrigerant side, two conditions frequently cause this code. Low refrigerant charge due to a system leak causes the evaporator coil pressure and temperature to drop abnormally low, accelerating freeze-up. A restricted capillary tube or metering device causes a similar drop in suction pressure and coil temperature by starving the evaporator of properly metered refrigerant. Both refrigerant-related causes require a licensed HVAC technician to diagnose and repair, as they involve working with pressurized refrigerant circuits.

Source: manufacturer service documentation.

Common causes of C7

  1. 01

    Clogged or Dirty Air Filter

    Part replacement

    A heavily restricted air filter blocks airflow across the evaporator coil, preventing it from absorbing heat and causing the coil temperature to drop until it freezes. Inspect the filter and replace it if it is visibly clogged or has not been changed within the recommended service interval.

  2. 02

    Blower Motor or Fan Failure

    Part replacement

    If the indoor blower motor has failed, seized, or is running at reduced speed, airflow across the evaporator coil drops significantly and freeze-up occurs. Verify that the blower is running at the correct speed when the system is in cooling mode and listen for unusual motor noise.

  3. 03

    Low Refrigerant Charge Due to Leak

    Part replacement

    A refrigerant leak reduces system charge, lowering suction pressure and dropping evaporator coil temperature well below freezing. A technician will need to perform a pressure check and leak search to confirm this condition before recharging the system.

  4. 04

    Restricted Capillary Tube or Metering Device

    Part replacement

    A blockage in the capillary tube or other metering device starves the evaporator of refrigerant, causing abnormally low coil temperatures and freeze-up. This requires a refrigerant system diagnosis by a qualified technician to distinguish from a low charge condition.

  5. 05

    ICT or IAT Sensor Fault

    Wiring / connection

    If either the Indoor Coil Temperature sensor or the Indoor Air Temperature sensor is reading inaccurately, the control board may calculate a false temperature differential and trigger C7 even when the coil is not actually freezing. Check sensor connections and compare readings to ambient conditions.

See the test procedure for each cause

Frequently asked questions about C7

What does C7 mean on a Goodman air_conditioner?
Code C7 on a Goodman air conditioner means the system has detected an Indoor Coil Freezing Lockout. The control board monitors the temperature difference between the indoor coil sensor and the indoor air sensor, and when that gap exceeds 20 degrees Fahrenheit for more than 10 minutes, the unit shuts down. This protects the system from ice buildup on the evaporator coil and potential compressor damage.
How do I fix a C7 code on my Goodman air conditioner?
Start by turning off the system and checking your air filter, replacing it if it is dirty. Allow any ice on the indoor coil to melt fully before restarting, which can take 1 to 2 hours with the fan running in fan-only mode. If the code returns after the filter is clean and the blower is confirmed to be running normally, a refrigerant issue is likely and you will need a licensed HVAC technician to check system pressure and inspect for leaks or a restricted metering device.
Will resetting the Goodman unit clear the C7 code?
A power reset may temporarily clear the C7 lockout, but the code will return if the underlying cause is not corrected. If the coil is still iced over when the system restarts, it will freeze again quickly and re-trigger the lockout. Always let the coil thaw completely and address the root cause before attempting a reset.
Is it safe to run my Goodman air conditioner when it shows a C7 code?
No, you should not attempt to force the system to run while the C7 lockout is active. Running a frozen evaporator coil can allow ice to block airflow entirely and can cause liquid refrigerant to return to the compressor, leading to compressor failure. Leave the system off until the coil has thawed and the cause has been identified and corrected.
How much does it cost to repair a Goodman C7 error code?
Repair costs vary widely depending on the cause. Replacing a dirty air filter costs only a few dollars and is a simple DIY task. If the blower motor needs replacement, costs typically range from $150 to $450 including parts and labor. A refrigerant leak repair and recharge can range from $250 to $750 or more depending on the leak location and the amount of refrigerant required. A restricted capillary tube replacement is a more involved repair that can fall in the $300 to $600 range.

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