Service Call Q - Hitachi RAS-08LH2B Service Manual

SERVICE CALL Q & A
Cooling operation
While cooling, the compressor
Q1
sometimes stops abruptly.
Dehumidifying operation
The fan speed does
Q2
not change during a
dehumidifying operation.
Cold air comes out during a
Q3
dehumidifying operation.
The operation does not stop
Q4
even by raising the room
temperature setting of remote
control at a dehumidifying
operation.
In the dehumidifying mode,
Q5
the temperature set by
remote controller is set
slightly higher than the
room temperature but the
operation starts.
Check whether frost sticks on
A1
the heat exchanger of indoor
unit or not.
Wait for 3 – 4 minutes until
the frost melts.
The fan speed is always LO
A2
at a dehumidifying operation.
To improve the dehumidi-
A3
f i c a t i o n e ff i c i e n c y, L O
fan speed operation is
performed. Therefore the air
is cold. This is not a trouble.
At a dehumidifying operation,
A4
the actual room temperature
is compared with the room
t e m p e r a t u r e s e t t i n g w h e n
starting the operation and the
operation is as follows.
1) W h e n a c t u a l
t e m p e r a t u r e
temperature setting.
The operation is according to
the room temperature setting
on the remote controller.
2) * W h e n a c t u a l r o o m
t e m p e r a t u r e
temperature setting
Regardless of the room
temperature setting, the
temperature is automatically
set slightly lower than the
room temperature.
In this case, the status is as 2)
and, therefore, the operation by
the room temperature control
is impossible. Turn off the On
/ OFF switch, set the room
temperature to a new value and
turn on the operation by the On
/ Off switch.
This is the status in 2) of
A5
(A4). The temperature is set
a little lower than the room
temperature to carry out a
dehumidifying operation as
far as possible.
– 59 –
If cooling is performance
when the room tempera-
ture is low, frost may stick
on the heat exchanger of
indoor unit.
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