Error Code PC06 in Air Conditioners: Explanation and Diagnosis

The PC06 error code in an air conditioner is related to a high temperature detected in the compressor discharge line by the temperature sensor. This error occurs when the discharge temperature measured by the thermistor or sensor exceeds 239°F (approximately 115°C) for 10 seconds, causing the compressor to shut down as a protective measure.

Once the detected temperature drops below 194°F (approximately 90°C), the compressor will automatically restart.

Diagnostic Procedure for Error Code PC06:

1. Check the temperature with a digital thermometer or infrared gun:
   • Immediately after the compressor stops, measure the temperature of the thin compressor pipe.
   • If the temperature is below 239°F (115°C), the error could be a false alarm.
2. Inspect the temperature sensor wiring:
   • Ensure that the wiring between the compressor discharge sensor and the main control board is correct, following the electrical diagrams.
3. Test the temperature sensor:
   • Disconnect the sensor from the electronic board and measure its electrical resistance using a multimeter.
   • The resistance should match the values specified for the sensor’s operating temperature.
   • The reading should never be 0 or infinite.
4. Analyze the temperature if it exceeds 239°F (115°C):
   • Check the compressor’s electrical consumption with a clamp ammeter and compare it to the normal values indicated on the equipment label.
   • Ensure the outdoor unit is clean and that its fan is working correctly to provide adequate airflow.
5. Inspect the insulation and check for refrigerant leaks:
   • Verify that the pipes connecting the outdoor and indoor units are properly insulated.
   • If the electrical consumption is below normal, look for oil stains on the pipes, which could indicate a refrigerant leak.
6. Test the compressor in case of high electrical consumption:
   • Use a multimeter to measure the electrical resistance between the compressor pins. The resistances should be equal.
   • Some compressors have a high-temperature protection switch. Check that the connectors are secure and test the switch’s continuity when the temperature is normal.

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