10
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Troubleshooting
Installer and user reference guide
44
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
(a)
The error code is only shown on the user interface of the indoor unit where the error
occurs.
10.2 Symptoms that are NOT system malfunctions
The following symptoms are NOT system malfunctions:
10.2.1 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.
10.2.2 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.
10.2.3 Symptom: The fan speed does not correspond to the setting
The fan speed does not change even if the fan speed adjustment button is pressed.
During heating operation, when the room temperature reaches the set
temperature, the outdoor 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.
10.2.4 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.
10.2.5 Symptom: White mist comes out of a unit (Indoor unit)
▪
When humidity is high during cooling operation. If the interior of an indoor unit is
extremely contaminated, the temperature distribution inside a room becomes
uneven. It is necessary to clean the interior of the indoor unit. Ask your dealer for
details on cleaning the unit. This operation requires a qualified service person.
▪
Immediately after the cooling operation stops and if the room temperature and
humidity are low. This is because warm refrigerant gas flows back into the indoor
unit and generates steam.
