Cooling Operation; Dehumidification; Heating Operation; Service Call Q & A - Hitachi RAC-18WEC Service Manual

SERVICE CALL Q&A

Cooling operation

Q1 The compressor sometimes
stops during cooling.

Dehumidification

The indoor unit produces a noise that
Q1
goes "shaaahhh" during
dehumidification.
Cold air comes out during a
Q2
dehumidifying operation.
Q 3
The operation does not stop even by
setting the temperature higher than
room temperature on the remote
controller.

Heating operation

Q1
The product sometimes fails to
produce a wind during heating.
The product begins with a slight fan
Q2
speed during heating even though set
to "Hi fan" or "Med fan" or "Low fan" or
"silent fan".
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.
A1
A1
A2
A
A1
A2
A3
."
A1
Check if the heat
exchanger of the indoor
unit is covered with frost.
Wait for 3 to 4 minutes
until the frost disappears.
That is a noise produced by refrigerant flowing through
the pipe.
To improve the dehumidification efficiency performs
quiet fan operation. Therefore the air is cold and it is
not a malfunction.
3
It sets to perform dehumidifying operation by setting
the temperature slightly lower than remote controller
setting.
Defrosting is in progress. Wait 5 to 10 minutes until
the frost on the outdoor unit disappears.
At the first of the heating, the product will run for 30 seconds
with a slight fan speed. When set to strong fan speed, the
product will begin with a slight fan speed operation, producing
a weak fan speed for 30 seconds, and then switch to strong
speed .
fan
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 frost
and, if there is any frost, conduct defrosting and then
stop operating.
Cooling when the room
temperature is low may
cause the heat exchanger
of the indoor unit to gather
frost.