SiBE37-701_B Troubleshooting by Indication on the Remote Controller
Troubleshooting 346
3.51
“
U4
”
Malfunction of Transmission between Indoor Units
and Outdoor Units
Remote
Controller
Display
U4
Applicable
Models
All indoor unit models
REYQ8P~48P
Method of
Malfunction
Detection
Check if the transmission between indoor unit and outdoor unit is correctly executed using
micro-computer.
Malfunction
Decision
Conditions
When transmission is not carried out normally for a certain amount of time
Supposed
Causes
Indoor to outdoor, outdoor to outdoor transmission wiring F1, F2 disconnection, short circuit
or wrong wiring
Outdoor unit power supply is OFF
System address does not match
Defect of indoor unit PCB
Defect of outdoor unit PCB
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