U4" Malfunction Of Transmission Between Indoor Units - Daikin CMSQ200A7W1B Service Manual

Troubleshooting by Indication on the Remote Controller
U4
3.42 " " Malfunction of Transmission Between Indoor Units
U4
Remote
Controller
Display
Applicable All model of indoor unit
CMSQ200A7, 250A7
Models
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
Supposed
Causes
196
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
SiBE28-805
Troubleshooting