SiUS30-604 Troubleshooting by Indication on the Remote Controller
Troubleshooting 213
2.41 “U4” Malfunction of Transmission between Indoor Units
Remote
Controller
Display
U4
Applicable
Models
All model of indoor unit
RWEYQ60, 72, 84MTJU
Method of
Malfunction
Detection
Microcomputer checks if transmission between indoor and outside units is normal.
Malfunction
Decision
Conditions
When transmission is not carried out normally for a certain amount of time
Supposed
Causes
Indoor to outdoor, outside to outside unit transmission wiring F1, F2 disconnection, short circuit
or wrong wiring
Outside unit power supply is OFF
System address doesn’t match
Defect of indoor unit PC board
Defect of outside unit PC board
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