14 Troubleshooting
Installation and operation manual
29
RKXYQ5T7Y1B
VRV IV compressor unit for indoor installation
4P408443-1 – 2015.07
Malfunction
Measure
If the user interface display indicates the
unit number, the operation lamp flashes
and the malfunction code appears.
Notify your installer and
report the malfunction
code.
If the system does not properly operate except for the above
mentioned cases and none of the above mentioned malfunctions is
evident, investigate the system according to the following
procedures.
Malfunction
Measure
If the system does not
operate at all.
▪ Check if there is no power failure. Wait
until power is restored. If power failure
occurs during operation, the system
automatically restarts immediately after
the power supply is recovered.
▪ Check if no fuse has blown or breaker
has worked. Change the fuse or reset the
breaker if necessary.
If the system goes into
fan only operation, but
as soon as it goes into
heating or cooling
operation, the system
stops.
▪ Check if air inlet or outlet of heat
exchanger unit or indoor unit is not
blocked by obstacles. Remove any
obstacle and make it well-ventilated.
▪ Check if the user interface display shows
(time to clean the air filter). (Refer to
"13 Maintenance and service" on
page 28
and "Maintenance" in the indoor
unit manual.)
The system operates
but cooling or heating
is insufficient.
▪ Check if air inlet or outlet of heat
exchanger unit or indoor unit is not
blocked by obstacles. Remove any
obstacle and make it well-ventilated.
▪ Check if the air filter is not clogged (refer
to "Maintenance" in the indoor unit
manual).
▪ Check the temperature setting.
▪ Check the fan speed setting on your user
interface.
▪ Check for open doors or windows. Shut
doors and windows to prevent wind from
coming in.
▪ Check if there are too many occupants in
the room during cooling operation. Check
if the heat source of the room is
excessive.
▪ Check if direct sunlight enters the room.
Use curtains or blinds.
▪ Check if the air flow angle is proper.
If after checking all above items, it is impossible to fix the problem
yourself, contact your installer and state the symptoms, the complete
model name of the air conditioner (with manufacturing number if
possible) and the installation date (possibly listed on the warranty
card).
14.1
Error codes: Overview
In case a malfunction code appears on the indoor unit user interface
display, contact your installer and inform the malfunction code, the
unit type, and serial number (you can find this information on the
nameplate of the unit).
For your reference, a list with malfunction codes is provided. You
can, depending on the level of the malfunction code, reset the code
by pushing the ON/OFF button. If not, ask your installer for advice.
Main code
Contents
External protection device was activated
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)
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
