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Error Code PC02 in Air Conditioners

Let’s start by explaining that this code may appear when

  1. The temperature of the Intelligent Power Module (IPM), located on the electronic board of the outdoor unit and responsible for supplying current to the compressor motor, exceeds a specific value.
  2. The temperature at the compressor head surpasses a determined limit.
  3. In some models equipped with a high-pressure switch, if the high-side pressure exceeds a set value, the switch interrupts the power supply to the compressor and displays error code PC02.

This code is used by many manufacturers, such as Carrier, Lenox, Midea, Mr. Cool, and Pioneer, to indicate related issues. Below are the general steps to resolve this error code:


General Steps to Resolve Error Code PC02

  1. Restart the unit:
    • Disconnect the unit from the power supply for several minutes.
    • Turn it back on and check if the error persists.
  2. Check the power supply voltage:
    • Use a multimeter in AC voltage mode to measure the power supply voltage.
    • A voltage lower than normal can increase current consumption, overheat the IPM, and trigger error code PC02.
  3. Inspect the fans:
    • Ensure the fans rotate freely and correctly to rule out bearing issues.
    • Check the electrical connections, and if the fans use capacitors, test them with a multimeter in capacitance mode.
  4. Clean the system:
    • Clean the coils of the outdoor and indoor units, as well as the air filter.
  5. Inspect the IPM module:
    • Locate the Intelligent Power Module (IPM) on the electronic board of the outdoor unit.
    • Check the screws securing the board to the heat exchanger of the module to ensure proper contact and effective heat dissipation.
  6. Check the electrical connections to the compressor:
    • Inspect and fix any loose or damaged connections that supply power to the compressor.
  7. Visually inspect the electronic board:
    • Check the traces on the board that run from the IPM module to the connector powering the compressor.
  8. Test the compressor:
    • Electrically disconnect the compressor.
    • Using a multimeter in low-resistance mode, measure the resistance between the compressor pins.
    • The values between each pair of pins should be almost identical, ruling out internal electrical issues in the compressor motor.
  9. Units with a high-pressure switch:
    • Turn off the unit and check the firmness of the high-pressure switch connections.
    • Disconnect the electrical plug of the high-pressure switch and ensure that, when the unit is off, the pressure allows current to pass for proper operation.

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