Hitachi RAS-25JX4 Service Manual page 78

Q16
When the ÒSleepÓ timer is set during
operation,
(1) The indoor fan wonÕt rotate.
(No air comes from the unit)
(2) The air speed wonÕt change.
Q17
The preset temperature is not
indicated on the remote control.
THERS
Q18
The indoor fan varies among
high air flow, low air flow and
breeze in the auto fan speed
mode. (Heating operation)
Q19
Loud noise from the outdoor unit is
heard when operation is started.
Q20
Noise from the outdoor unit
occasionally changes.
Q21
There is a difference between the set
temperature and room temperature.
Q22
Air does not flow immediately
after operation is started.
A16
(1) The temperature arrives at the preset indoor
temperature and the air conditioner unit is
temporarily stopped. Within about 3 minutes,
the fan starts rotation.
(2) When the unit operates at ÒLOWÓ air speed,
it continues to operate at the same speed.
A17
When automatic operation is performed, the
preset temperature wonÕt be indicated.
However, you can adjust the temperature within
a range of ±3¡C by pressing the ÒRoom
TemperatureÓ button.
If the temperature is 1¡C higher than the auto
preset temperature,
If the temperature is 1¡C lower than the auto
preset temperature,
A18
This is because the cool
wind prevention function
is operating, and does
not indicate a fault.
A19
When operation is started, the compressor
rotation speed goes to maximum to increase the
heating or cooling capability, so noise becomes
slightly louder. This does not indicate a fault.
A20
The compressor rotation speed changes according to
the difference between the thermostat set temperature
and room temperature. This does not indicate a fault.
A21
There may be a difference between the set
temperature and room temperature because of
construction of room, air current, etc. Set the
temperature at a comfortable for the space.
A22
Preliminary operation is performed for one
minute when the power switch on and heating
or dehumidifying is set. The operation lamp
blinks during this time for heating. This does
not indicate a fault.
83
1¡C will appear.
1¡C will appear.
The heat exchanger temperature
is sensed in the auto speed mode.
When the temperature is low, the
fan speed varies among high air
flow, low air flow and breeze.