P6 Error Code in Air Conditioners

The P6 error code in air conditioners can have different interpretations depending on the brand and model of the equipment. Below, we detail the possible meanings and recommended solutions to address this issue.

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1. Communication Problem

This code may indicate a failure in communication between the drive and the main control or between the main control and the unit. This interpretation is common across various brands, with Sharp being a notable example.

Steps to resolve this issue:

1. Electrical Disconnection:
   • Turn off and disconnect the equipment for at least 10 minutes.
   • Turn it back on and check if the error disappears.
2. Voltage Check:
   • Use a multimeter to check the voltage supplied by the electrical grid.
3. Signal Cable Inspection:
   • Ensure the signal cable between the indoor and outdoor units is in good condition and properly connected.
   • Measure the DC voltage between the “S” terminal and neutral; the voltage should oscillate between positive and negative values. If the voltage is constant, there is likely an issue with the electronic modules.
4. Reactor Continuity:
   • Use a multimeter set to continuity mode to check the reactor in the outdoor unit.

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2. Brand-Specific Interpretations

Trane Multisplit

• Meaning: Communication error in the control board.
• Solution:
  • Check the connections between the electronic modules.
  • Measure the compressor’s current consumption with a clamp meter to identify anomalies.

Trane (Other Models)

• Meaning: Malfunction or protection of the IPM modules, especially in the indoor unit.
• Solution:
  • Verify the connections between the electronic module and the compressor.

For more information:
See: How to Solve Compressor Overcurrent Issues.

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Daewoo

• Meaning: Protection of the condenser against high temperatures.
• Solution:
  1. Disconnect the equipment for several minutes.
  2. Check the condenser’s cleanliness and the speed of the outdoor unit fan.
  3. Inspect the fan connections.

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Bosch and Midea

• Meaning: Low-pressure protection of the compressor.
• Solution:
  1. Clean the indoor unit’s evaporator and check the filter.
  2. Verify the indoor unit’s fan speed, connections, and capacitors.
  3. Perform a visual inspection of the pipes and connections, looking for oil stains that might indicate leaks.

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Carrier

• Indoor Unit: Voltage protection for the compressor.
• Outdoor Unit: IPM module protection.
• General Solution:
  • Inspect the connections, voltage, and IPM module condition.

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