Goodman Air Conditioner Error Code C1

The C1 code on a Goodman air conditioner means the indoor evaporator coil is freezing up. Ice formation on the coil restricts airflow and prevents the system from cooling effectively. The most common causes are a clogged air filter, a blower that is not operating correctly, low refrigerant due to a leak, or a restricted capillary tube.

Continuing to run the system with a frozen coil is not recommended. Ice buildup progressively blocks airflow and can force liquid refrigerant back into the compressor, which can cause serious and expensive compressor damage. Turn the system off and let it thaw before attempting any diagnosis or restarting the unit.

Costs vary widely depending on the root cause. Replacing an air filter is a low-cost fix in the range of a few dollars to around $30. Blower motor replacement typically runs in the range of $150 to $600 or more including labor. Refrigerant leak repair and recharge can range from $200 to $1,500 or higher depending on the location of the leak, refrigerant type, and labor rates in your area.

Start by turning the system off and allowing the coil to thaw completely, which can take several hours. Then replace the air filter if it is dirty and confirm the indoor blower fan is running properly when the unit is powered on. If the error returns after these steps, a technician will need to check refrigerant pressure and inspect the capillary tube for restrictions or evidence of a refrigerant leak.

Resetting the unit may temporarily clear the code, but if the underlying cause is not corrected the coil will freeze again and C1 will return. A reset is only useful as a first step after you have already addressed the root cause, such as replacing the filter or confirming blower operation. Persistent C1 codes after a reset indicate a refrigerant or mechanical issue that requires professional diagnosis.