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8 Troubleshooting
Main code
Movement detector or floor temperature sensor
malfunction (indoor)
User interface thermistor malfunction (indoor)
Fan or drain pump malfunction (heat exchanger unit)
PCB malfunction (compressor unit)
Current leakage detector was activated (compressor
unit)
High pressure switch was activated
Low pressure malfunction (compressor unit)
Compressor lock detection (compressor unit)
Electronic expansion valve malfunction (compressor
unit or heat exchanger unit)
Discharge temperature malfunction (compressor unit)
Abnormal suction temperature (compressor unit)
Refrigerant overcharge detection
High pressure switch malfunction
Low pressure switch malfunction
Ambient temperature sensor malfunction (heat
exchanger unit)
Pressure sensor malfunction
Current sensor malfunction
Discharge temperature sensor malfunction
(compressor unit)
Heat exchanger gas temperature sensor malfunction
(heat exchanger unit)
Suction temperature sensor malfunction (compressor
unit)
De-icing temperature sensor malfunction (heat
exchanger unit)
Liquid temperature sensor (after subcool HE)
malfunction (compressor unit)
Gas temperature sensor (after subcool HE)
malfunction (compressor unit)
High pressure sensor malfunction (BIPH)
Low pressure sensor malfunction (BIPL)
INV PCB abnormal
Fin temperature abnormal
Inverter PCB faulty
Compressor over current detected
Compressor lock (startup)
Transmission compressor unit - inverter: INV
transmission trouble
INV unbalanced power supply voltage
Fin thermistor malfunction
Heat exchanger unit capacity setting malfunction.
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/heat exchanger unit/compressor
unit
Abnormal user interface - indoor communication
Abnormal main-sub user interface communication
System mismatch. Wrong type of indoor units
combined. Indoor unit malfunction. Heat exchanger
unit malfunction.
Installation and operation manual
14
Contents
Main code
Connection malfunction over indoor units or type
mismatch (wrong type of indoor units or heat
exchanger unit)
Centralised address duplication
Malfunction in communication centralised control
device - indoor unit
Auto address malfunction (inconsistency)
Auto address malfunction (inconsistency)
8.2
Symptoms that are NOT system
malfunctions
The following symptoms are NOT system malfunctions:
8.2.1
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.
8.2.2
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.
8.2.3
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.
8.2.4
Symptom: The fan speed does not
correspond to the setting
The fan speed does not change even if the fan speed adjustment
button in pressed. During heating operation, when the room
temperature reaches the set temperature, the compressor unit goes
off and the indoor unit changes to whisper fan speed. This is to
prevent cold air blowing directly on occupants of the room. The fan
speed will not change even when another indoor unit is in heating
operation, if the button is pressed.
8.2.5
Symptom: The fan direction does not
correspond to the setting
The fan direction does not correspond with the user interface
display. The fan direction does not swing. This is because the unit is
being controlled by the micro computer.
VRV IV compressor unit for indoor installation
Contents
(change-over under centralized
(change-over under centralized
RKXYQ5T8 + RKXYQ8T7Y1B
4P499900-1B – 2021.12
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