Daikin RXYQ8P7YLK [10/12] Troubleshooting
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Daikin RXYQ8P7YLK [10/12] Troubleshooting

Daikin RXYQ12P7Y1K [10/12] Troubleshooting
Operation manual
8
RXYQ8~12P7Y1K + RXYQ8~12P7YLK
VRVIII system air conditioner
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 optimize 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 remote controller 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.
Symptom 16: The units does not cool very well
■ Program dry operation
Program dry operation is designed for decreasing the air
humidity with a minimal temperature decrease.
The temperature and fan speed are controlled automatically and
cannot be controlled by the remote controller.
Dry operation will not function if the room temperature is too low.
This function is not available if the room temperature is ≤20°C.
10. TROUBLESHOOTING
If one of the following malfunctions occur, take the measures shown
below and 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 display , the unit number and the operation lamp
flash and the malfunction code appears. (See figure 12)
Measure: Notify your dealer 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 remote controller display shows " " (time to clean
the air filter). (Refer to "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 remote controller.
■ 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 dealer 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).
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.
1 Inspection display
2 Indoor unit number in which a malfunction occurs
3 Operation lamp
4 Malfunction code
4PW41759-1A – 08.2011

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