Troubleshooting - Daikin RYYQ8T7Y1B Installation And Operation Manual

Symptom 8.2: Indoor unit, outdoor unit
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.
Symptom 8.3: Outdoor unit
When the tone of operating noise changes.

This noise is caused by the change of frequency.
Symptom 9: 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.
Symptom 10: The units can give off odours
 The unit can absorb the smell of rooms, furniture, cigarettes,
etc., and then emit it again.
Symptom 11: The outdoor unit fan does not spin
 During operation.
The speed of the fan is controlled in order to optimise product
operation.
Symptom 12: The display shows "
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 one minute.
Symptom 13: The compressor in the outdoor unit does not stop
after a short heating operation
This is to prevent oil and refrigerant from remaining in the

compressor. The unit will stop after 5 to 10 minutes.
Symptom 14: The inside of an outdoor unit is warm even when
the unit has stopped
This is because the crankcase heater is warming the

compressor so that the compressor can start smoothly.
Symptom 15: Hot air can be felt when the indoor unit is stopped
Several different indoor units are being run on the same system.

When another unit is running, some refrigerant will still flow
through the unit.
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV System Air Conditioner
4P329765-1 – 2012.09
"

10. Troubleshooting

If one of the following malfunctions occur, take the measures shown
below and contact your dealer.
WARNING
Stop operation and shut off the power if anything
unusual occurs (burning smells etc.).
Leaving the unit running under such circumstances may
cause breakage, electric shock or fire. Contact your dealer.
The system must be repaired by a qualified service person:
If a safety device such as a fuse, a breaker or an earth leakage

breaker frequently actuates or the ON/OFF switch does not
properly work.
Measure: Turn off the main power switch.
If water leaks from the unit.

Measure: Stop the operation.
The operation switch does not work well.

Measure: Turn off the power.
If the user interface display indicates the unit number, the

operation lamp flashes and the malfunction code appears.
Measure: Notify your installer and report the malfunction code.
If the system does not properly operate except for the above
mentioned cases and none of the above mentioned malfunctions is
evident, investigate the system according to the following
procedures.
1 If the system does not operate at all:
 Check if there is no power failure.
Wait until power is restored. If power failure occurs during
operation, the system automatically restarts immediately
after the power supply is recovered.
 Check if no fuse has blown or breaker has worked.
Change the fuse or reset the breaker if necessary.
2 If the system goes into fan only operation, but as soon as it goes
into heating or cooling operation, the system stops:
Check if air inlet or outlet of outdoor or indoor unit is not blocked
by obstacles. Remove any obstacle and make it well-ventilated.
Check if the user interface display shows
air filter). (Refer to "17. Maintenance and service" on page 48
and "Maintenance" in the indoor unit manual.)
3 The system operates but cooling or heating is insufficient:
 Check if air inlet or outlet of outdoor or indoor unit is not
blocked by obstacles.
 Remove any obstacle and make it well-ventilated.
 Check if the air filter is not clogged (refer to "Maintenance" in
the indoor unit manual).
 Check the temperature setting.
 Check the fan speed setting on your user interface.
 Check for open doors or windows. Shut doors and windows
to prevent wind from coming in.
 Check if there are too many occupants in the room during
cooling operation. Check if the heat source of the room is
excessive.
 Check if direct sunlight enters the room. Use curtains or
blinds.
 Check if the air flow angle is proper.
If after checking all above items, it is impossible to fix the problem
yourself, contact your installer and state the symptoms, the complete
model name of the air conditioner (with manufacturing number if
possible) and the installation date (possibly listed on the warranty
card).
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Installation and operation manual
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