Hitachi RAC-18WPC, Service Manual, Page: 24 / 43

During an automatic run, switching
the wind speed selector will not
change the wind speed.
Q1
Automatic operation
During heating, I turned off the
product by using the START/STOP
button. But the "operation lamp" is
blinking and the outdoor unit is
running. Q1
Auto-fresh defrost
The product stops during heating
even though it is set to "30 ."
Q3
The product begins with a slight wind
during heating even though set to
"strong wind" or "weak wind."
Q2
The product sometimes fails to
produce a wind during heating.
Q1
Heating operation
The indoor unit produces a noise that
goes "shaaahhh" during
dehumidification.
Q1
Dehumidification
The compressor sometimes
stops during cooling. Q1
Cooling operation
A1
Check if the heat
exchanger of the indoor
unit is covered with dew.
Wait for 3 to 4 minutes
until the dew disappears.
A1
That is a noise produced by refrigerant flowing through
the pipe.
A1 Defrosting is in progress. Wait 5 to 10 minutes until
the dew on the outdoor unit disappears.
At the first of the heating, the product will run for 30 seconds
with a slight wind. When set to strong wind, the product will
begin with a slight wind operation, producing a weak wind for
30 seconds, and then switch to strong wind.
A2
A3
When heating is conducted despite the high outdoor
temperature, the product may stop to protect its
equipment.
The "auto-fresh defrost" should be working. When
stopped, the product will check its outdoor unit for dew
and, if there is any dew, conduct defrosting and then
stop operating.
A1
A1
The product will switch automatically to automatic wind
speed. You cannot select strong or weak wind by
remote control but you can select wind and quiet.
Cooling when the room
temperature is low may
cause the heat exchanger
of the indoor unit to gather
dew.
SERVICE CALL Q&A
ć
Q2 A2
A Q
Cold air comes out during a
dehumidifying operation.
The operation does not stop even by
setting the temperature higher than
room temperature on the remote
controller.
To improve the dehumidification efficiency performs
quiet fan operation. Therefore the air is cold and it is
not a malfunction.
It sets to perform dehumidifying operation by setting
the temperature slightly lower than remote controller
setting.
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