Service Call Q&A; Cooling Operation; Heating Operation; Automatic Operation - Hitachi RAC-18SX8 Service Manual

SERVICE CALL Q&A
MODEL RAS-18SX8

Cooling operation

Q1 The compressor sometimes
stops during cooling.
Dehumidification
The indoor unit produces a noise that
Q1
goes "shaaahhh" during
dehumidification.
Q2
The compressor sometimes fails to
run during dehumidification.

Heating operation

Q1
The product sometimes fails to
produce a wind during heating.
Q2
The product begins with a slight wind
during heating even though set to
"strong wind" or "weak wind."
Q3
The product stops during heating
even though it is set to "30."
Auto-fresh defrost
Q1 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.

Automatic operation

Q1
During an automatic run, switching
the wind speed selector will not
change the wind speed.
New nice temperature reservation
Q1
When the ON timer is activated, the
product will not start operating at the
reserved time. Instead, it will start
running too early.
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.
A2
It may not run when the room temperature is 10 ℃ or
less. It will stop when the humidity goes below the
humidity setting.
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
A2
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.
A3
When heating is conducted despite the high outdoor
temperature, the product may stop to protect its
equipment.
A1
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
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.
It is because the "new nice temperature reservation" is
A1
working. At the reserved time, the product will begin
running in good time to make the room temperature
reach its setting. It will begin running up to 60 minutes
before the reserved time.
– 198 –
Cooling when the room
temperature is low may
cause the heat exchanger
of the indoor unit to gather
dew.