11 | Troubleshooting
Installer and user reference guide
43
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
11.2 Symptoms that are NOT system malfunctions
The following symptoms are NOT system malfunctions:
11.2.1 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.
11.2.2 Symptom: Cool/Heat cannot be changed over
▪ When the display shows (change-over under centralized control), it shows
that this is a slave user interface.
▪ When the cool/heat changeover remote control switch is installed and the
display shows (change-over under centralized 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.
11.2.3 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.
11.2.4 Symptom: The fan speed does not correspond to the setting
The fan speed does not change even if the fan speed adjustment button 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.
11.2.5 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.
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