HXHD125A7V1B
VRVIII system air conditioner
4PW62583-1 – 11.2010
Operation manual
8
Symptom 6.2: Indoor unit, outdoor unit
■
When the system is changed over to heating operation after
defrost operation
Moisture generated by defrost becomes steam and is
exhausted.
Symptom 7: The remote controller display reads "U4" or "U5" and stops,
but then restarts after a few minutes
■
This is because the remote control is intercepting noise from
electric appliances other than the air conditioner. This prevents
communication between the units, causing them to stop.
Operation automatically restarts when the noise ceases.
Symptom 8: Noise of air conditioners
Symptom 8.1: Indoor unit
■
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 the other 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.
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.
10. T
ROUBLESHOOTING
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.
1
Inspection display
2
Indoor unit number in which a malfunction occurs
3
Operation lamp
4
Malfunction code
Measure: Notify your dealer and report the malfunction code.
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.
TEST
UNIT NO.
1
2
3
4
