1. Error Detection Method
It is judged an error when a unit itself cannot receive a signal that it has sent.
Indoor unit control PC board
|1-1||Is the indoor/outdoor operation line connected to more than one outdoor unit? (Network wired?)||Yes||1-2|
|1-2||Is the SHORT on the terminal resistor select switch on the outdoor main PC board set to one unit, and the others are OPEN?||Yes||1-4|
|No||Set the SHORT to one unit only|
|1-3||Is the terminal resistor select switch on the outdoor main PC board set to OPEN?||Yes||Make the SHORT setting|
|1-4||Is the indoor/outdoor operation line opened or shorted?||Yes||Correct the wiring|
|1-5||Replace the indoor unit control PC board.|
For information on the procedures for replacing the indoor unit’s control PC board, refer to the manual that is packaged withthe indoor unit service board.