Symptoms That Are Not System Malfunctions; Symptom: The System Does Not Operate; Symptom: Cool/Heat Cannot Be Changed Over - Daikin VRV IV RXMLQ8T7Y1B Series Installation And Operation Manual

Main code
EEPROM failure (indoor)
Drain system malfunction (indoor)
Fan motor malfunction (indoor)
Swing flap motor malfunction (indoor)
Expansion valve malfunction (indoor)
Drain malfunction (indoor unit)
Filter dust chamber malfunction (indoor)
Capacity setting malfunction (indoor)
Transmission malfunction between main PCB and sub
PCB (indoor)
Heat exchanger thermistor malfunction (indoor; liquid)
Heat exchanger thermistor malfunction (indoor; gas)
Suction air thermistor malfunction (indoor)
Discharge air thermistor malfunction (indoor)
Movement detector or floor temperature sensor
malfunction (indoor)
User interface thermistor malfunction (indoor)
PCB malfunction (outdoor)
Current leakage detector was activated (outdoor)
High pressure switch was activated
Low pressure malfunction (outdoor)
Compressor lock detection (outdoor)
Fan motor malfunction (outdoor)
Electronic expansion valve malfunction (outdoor)
Discharge temperature malfunction (outdoor)
Abnormal suction temperature (outdoor)
Refrigerant overcharge detection
High pressure switch malfunction
Low pressure switch malfunction
Fan motor trouble (outdoor)
Ambient temperature sensor malfunction (outdoor)
Pressure sensor malfunction
Current sensor malfunction
Discharge temperature sensor malfunction (outdoor)
Heat exchanger gas temperature sensor malfunction
(outdoor)
Suction temperature sensor malfunction (outdoor)
De-icing temperature sensor malfunction (outdoor)
Liquid temperature sensor (after subcool HE)
malfunction (outdoor)
Liquid temperature sensor (coil) 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
Autocharge operation related
Fin thermistor malfunction
Autocharge operation related
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543426-1 – 2018.07
Contents Main code
Autocharge operation related
Autocharge operation related
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)
15.2 Symptoms that are NOT system
malfunctions
The following symptoms are NOT system malfunctions:
15.2.1

Symptom: The system does not operate

▪ 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 starts 5 minutes after it
is turned ON again in case it was turned OFF just before. The
same starting delay occurs after the operation mode selector
button was used.
▪ If "Under Centralized Control" is displayed on the user interface,
pressing the operation button causes the display to blink for a few
seconds. The blinking display indicates that the user interface
cannot be used.
▪ The system does not start immediately after the power supply is
turned on. Wait one minute until the micro computer is prepared
for operation.
15.2.2 Symptom: Cool/Heat cannot be changed
over
▪ When the display shows
control), it shows that this is a slave user interface.
▪ When the cool/heat changeover remote control switch is installed
and the display shows
control), this is because cool/heat changeover is controlled by the
cool/ heat changeover remote control switch. Ask your dealer
where the remote control switch is installed.
15.2.3 Symptom: Fan operation is possible, but
cooling and heating do not work
Immediately after the power is turned on. The micro computer is
getting ready to operate and is performing a communication check
with all indoor units. Please wait 12 minutes maximally until this
process is finished.
15 Troubleshooting
Contents
(change-over under centralized
(change-over under centralized
Installation and operation manual
35