Symptoms That Are Not System Malfunctions; Symptom: The System Does Not Operate - Daikin RXYSQ4T8VB Series Installer And User Reference Manual

11.2 Symptoms that are NOT system malfunctions

11.2.1 Symptom: The system does not operate

RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
Main code
Liquid temperature sensor (after subcool HE) malfunction
(outdoor)
Gas temperature sensor (after subcool HE) malfunction (outdoor)
High pressure sensor malfunction (S1NPH)
Low pressure sensor malfunction (S1NPL)
INV PCB abnormal
Fin temperature abnormal
Inverter PCB faulty
Compressor over current detected
Compressor lock (startup)
Transmission outdoor unit - inverter: INV transmission trouble
INV unbalanced power supply voltage
Fin thermistor malfunction
Capacity setting malfunction (outdoor)
Abnormal low pressure drop, faulty expansion valve
Reversed power supply phase malfunction
INV voltage power shortage
System test run not yet executed
Faulty wiring indoor/outdoor
Abnormal user interface - indoor communication
Faulty wiring to outdoor/outdoor
Abnormal main-sub user interface communication
System mismatch. Wrong type of indoor units combined. Indoor
unit malfunction.
Connection malfunction over indoor units or type mismatch
Centralised address duplication
Malfunction in communication centralised control device - indoor
unit
Auto address malfunction (inconsistency)
Auto address malfunction (inconsistency)
The following symptoms are NOT system malfunctions:
▪ The air conditioner does not start immediately after the ON/OFF button on the
user interface is pressed. If the operation lamp lights, the system is in normal
condition. To prevent overloading of the compressor motor, the air conditioner
11 Troubleshooting
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Installer and user reference guide
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