U4" Malfunction Of Transmission Between Indoor Units And Outdoor Units - Daikin FCQ18PVJU Service Manual

SiUS28-902_a
U4
3.38 " " Malfunction of Transmission between Indoor Units
and Outdoor Units
U4
Remote
Controller
Display
Applicable AII indoor unit models
Models RZQ18~30PVJU
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
 Indoor to outdoor, outdoor to outdoor transmission wiring F1, F2 disconnection, short circuit
Supposed
Causes
 Outdoor unit power supply is OFF
 System address doesn't match
 Defect of outdoor unit P.C.B.
 Defect of indoor unit P.C.B.
Troubleshooting
or wrong wiring
Troubleshooting by Indication on the Remote Controller
134