10
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Troubleshooting
Installer and user reference guide
42
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
10.2.1 Symptom: The system does not operate
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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.
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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.
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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: Cool/Heat cannot be changed over
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When the display shows
(change-over under centralized control), it shows
that this is a slave user interface.
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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.
10.2.3 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.
10.2.4 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.
10.2.5 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.
10.2.6 Symptom: White mist comes out of a unit (Indoor unit)
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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.
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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.
