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Troubleshooting
Installer and user reference guide
41
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
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A continuous low "shah" sound is heard when the system is in cooling operation
or at a stop. When the drain pump (optional accessories) is in operation, this
noise is heard.
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A "pishi-pishi" squeaking sound is heard when the system stops after heating
operation. Expansion and contraction of plastic parts caused by temperature
change make this noise.
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A low "sah", "choro-choro" sound is heard while the indoor unit is stopped.
When another indoor unit is in operation, this noise is heard. In order to prevent
oil and refrigerant from remaining in the system, a small amount of refrigerant is
kept flowing.
11.2.10 Symptom: Noise of air conditioners (Indoor unit, outdoor unit)
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A continuous low hissing sound is heard when the system is in cooling or defrost
operation. This is the sound of refrigerant gas flowing through both indoor and
outdoor units.
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A hissing sound which is heard at the start or immediately after stopping
operation or defrost operation. This is the noise of refrigerant caused by flow
stop or flow change.
11.2.11 Symptom: Noise of air conditioners (Outdoor unit)
When the tone of operating noise changes. This noise is caused by the change of
frequency.
11.2.12 Symptom: Dust comes out of the unit
When the unit is used for the first time in a long time. This is because dust has
gotten into the unit.
11.2.13 Symptom: The units can give off odours
The unit can absorb the smell of rooms, furniture, cigarettes, etc., and then emit it
again.
11.2.14 Symptom: The outdoor unit fan does not spin
During operation. The speed of the fan is controlled in order to optimise product
operation.
11.2.15 Symptom: The display shows "88"
This is the case immediately after the main power supply switch is turned on and
means that the user interface is in normal condition. This continues for 1 minute.
11.2.16 Symptom: The compressor in the outdoor unit does not stop after a short heating
operation
This is to prevent refrigerant from remaining in the compressor. The unit will stop
after 5 to 10 minutes.
