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P6: Communication Failure Between Driver Board and Main Board


Safety Note: Before any component is electrically disconnected in the unit, shut off main power. Inverter board DC bus voltage can take up to 15 min to discharge.

Caution: Do not plug or unplug components while electrical power is present, this can damage the equipment and control boards.

Step 1: Check the Outdoor Board

  • Inspect the outdoor board for any visible signs of damage, loose connections, or burnt components. Ensure that all connections related to communication between the driver board and main board are secure.


Addressing any issues with the outdoor board may help resolve the communication failure between the driver board and main board. If the problem persists, further diagnostic steps may be necessary, involving checking communication cables, verifying board settings, and ensuring compatibility between the driver and main boards.

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