U4" Malfunction Of Transmission Between Indoor Units - Daikin R410As Service Manual

Troubleshooting by Indication on the Remote Controller
2.42 " U4 "
Malfunction of Transmission Between Indoor Units
U4
Remote
Controller
Display
Applicable All model of indoor unit
Models RXYQ5~48M
Method of Microcomputer checks if transmission between indoor and outdoor units is normal.
Malfunction
Detection
Malfunction When transmission is not carried out normally for a certain amount of time
Decision
Conditions
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Supposed
Causes
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204
Indoor to outdoor,outdoor to outdoor transmission wiring F1, F2 disconnection, short circuit
or 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
Si39-302
Troubleshooting