Hitachi RAF-25NH5 Instructions De Service page 282

ERVICE CALL Q&A
COOLING MODE
1
The compressor has stopped
suddenly during cooling
operation.
DEHUMIDIFYING MODE
1
Sound of running water is heard from
indoor unit during dehumidifying.
2
Compressor occasionally does not
operate during dehumidifying.
3
Cold air comes out during a
dehumidifying operation.
4
The operation does not stop even by
setting the temperature higher than
room temperature on the remote
controller.
HEATING MODE
1
The circulation stops occa-
sionally during Heating
mode.
2
When the fan speed is set
at HIGH or MED, the flow
is actually Weak.
3
Heating operation stops
while the temperature is
preset at "30".
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A1
Check if indoor heat
exchanger is frosted.
Wait for 3-4 minutes until
it is defrosted.
A1
A2
A3
A4
A1
It occurs during defrost-
ing
Wait for 5 -10 minutes
until the condenser is
defrosted.
A2
At the beginning of
heating, the fan speed
remains LOW for 30
seconds. If HIGH is
selected, it switches to
LOW and again to MED
after additional 30
seconds.
A3
If temperature is high in
the outdoor, heating
operation may stop to
protect internal devices.
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If the air conditioner operates
in cooling mode when it is
cold, the evaporator may get
frosted.
Normal sound when refrigerant flows in pipe.
Compressor may not operate when room
temperature is 10 or less. It also stops when the
℃
humidity is preset humidity or less.
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.