Symptom: Noise Of Air Conditioners (Indoor Unit); Symptom: Noise Of Air Conditioners (Indoor Unit, Outdoor Unit); Symptom: Noise Of Air Conditioners (Outdoor Unit); Symptom: Dust Comes Out Of The Unit - Daikin VRV IV+ Installer And User Reference Manual

19.2.9 Symptom: Noise of air conditioners (Indoor unit)

19.2.10 Symptom: Noise of air conditioners (Indoor unit, outdoor unit)

19.2.11 Symptom: Noise of air conditioners (Outdoor unit)

19.2.12 Symptom: Dust comes out of the unit

19.2.13 Symptom: The units can give off odours

19.2.14 Symptom: The outdoor unit fan does not spin

19.2.15 Symptom: The display shows "88"

RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
▪ A "zeen" sound is heard immediately after the power supply is turned on. The
electronic expansion valve inside an indoor unit starts working and makes the
noise. Its volume will reduce in about one minute.
▪ 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.
▪ 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.
▪ 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.
▪ 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.
▪ 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.
When the tone of operating noise changes. This noise is caused by the change of
frequency.
When the unit is used for the first time in a long time. This is because dust has
gotten into the unit.
The unit can absorb the smell of rooms, furniture, cigarettes, etc., and then emit it
again.
During operation. The speed of the fan is controlled in order to optimise product
operation.
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.
19 Troubleshooting
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Installer and user reference guide
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