Troubleshooting by Indication on the Remote Controller Si39-302204 Troubleshooting2.42 ìU4î Malfunction of Transmission Between Indoor UnitsRemoteControllerDisplayU4ApplicableModelsAll model of indoor unitRXYQ5~48MMethod ofMalfunctionDetectionMicrocomputer checks if transmission between indoor and outdoor units is normal.MalfunctionDecisionConditionsWhen transmission is not carried out normally for a certain amount of timeSupposedCauses! Indoor to outdoor,outdoor to outdoor transmission wiring F1, F2 disconnection, short circuitor wrong wiring! Outdoor unit power supply is OFF! System address doesn’t match! Defect of indoor unit PC board! Defect of outdoor unit PC board
