Trouble Shooting - Daikin FXMQ125NFRV16 Operation Manual

8-5 WHITE MIST COMES OUT OF A UNIT
Outdoor-air processing unit
• When humidity is high during cooling opera-
tion.
If the interior of the unit is extremely contami-
nated, the temperature distribution inside the unit
becomes uneven. It is necessary to clean the inte-
rior of the unit. Ask your Daikin dealer for details
on cleaning the unit. This operation requires a
qualified service person.
• Immediately after the cooling operation stops
and if the outdoor temperature and humidity
are low.
This is because warm refrigerant gas flows back
into the unit and generates steam.
Outdoor-air processing unit, outdoor unit
• When the system is changed over to heating
operation after defrost operation.
Moisture generated by defrost becomes steam
and is exhausted.
8-6 NOISE OF SYSTEM
Outdoor-air processing unit
• A "zeen" sound is heard immediately after the
power supply is turned on.
The electronic expansion valve inside the 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 unit is stopped.
When the other unit is in operation, this noise is
heard. In order to prevent oil and refrigerant from
remaining in the system, a small amount of refrig-
erant is kept flowing.
Outdoor-air processing 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 the system.
• 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.
Outdoor unit
• When the tone of operating noise changes.
This noise is caused by the change of frequency.
8-7 DUST COMES OUT OF THE UNIT
• When the unit is used after having stopped
operating for a long time.
This is because dust has gotten into the unit.
8-8 THE UNITS MAY GIVE OFF ODOURS
• The unit may absorb the smell of outdoor air.
8-9 THE OUTDOOR UNIT FAN DOES NOT
SPIN
• During operation.
The speed of the fan is controlled in order to opti-
mize product operation.
8-10 THE DISPLAY SHOWS
• This is the case immediately after the power
supply is turned on and means that the remote
controller is in normal condition. This contin-
ues for one minute.
8-11 THE COMPRESSOR IN THE OUT-
DOOR 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.
8-12 THE INSIDE OF AN OUTDOOR UNIT IS
WARM EVEN WHEN THE UNIT HAS
STOPPED
• This is because the crankcase heater is warm-
ing the compressor so that the compressor
can start smoothly.

9. TROUBLE SHOOTING

If one of the following malfunctions occur, take
the measures shown below and contact your
Daikin dealer.
The system must be repaired by a qualified ser-
vice 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 power supply.
• If water leaks from unit;
Measure: Stop the operation.
• If the display " ", the unit number and the
TEST
operation lamp flash and the malfunction code
appears; (Refer to figure 9)
" "