Daikin SkyAir FHQ24PVJU - Page 207

SiUS281811EA Symptom-based Troubleshooting
Part 6 Service Diagnosis 201
4 The system
does not
operate.
The system stops and
immediately restarts
operation.
If the operation lamp on the
remote controller turns ON, the
system will be normal. These
symptoms indicate that the
system is controlled so as not
to put unreasonable loads on
the system.
Normal operation. The system
will automatically start
operation after a lapse of five
minutes.
Pressing the temperature
setting button immediately
resets the system.
The remote controller
displays CENTRAL
CONTROL, which blinks for
a period of several seconds
when the OPERATION
button is depressed.
The system is controlled with
centralized controller. Blinking
display indicates that the
system cannot be operated
using the remote controller.
Operate the system using the
COOL/HEAT centralized
remote controller.
The system stops
immediately after turning ON
the power supply.
The system is in preparation
mode of microcomputer
operation.
Wait for a period of
approximately one minute.
5 The system
makes
intermittent
stops.
The remote controller
displays error codes U4 or
U5, and the system stops
but restarts after a lapse of
several minutes.
The system stops due to an
interruption in communication
between units caused by
electrical noises coming from
equipment other than air
conditioners.
Remove causes of electrical
noises.
If these causes are removed,
the system will automatically
restart operation.
6COOL/HEAT
selection is
disabled.
The remote controller
displays CENTRAL
CONTROL.
This remote controller has no
option to select cooling
operation.
Use a remote controller with
option to select cooling
operation.
The remote controller
displays CENTRAL
CONTROL, and the COOL/
HEAT selection remote
controller is provided.
COOL/HEAT selection is made
using the COOL/HEAT
selection remote controller.
Use the COOL/HEAT selection
remote controller to select cool
or heat.
7 The system
conducts fan
operation but
not cooling or
heating
operation.
This symptom occurs
immediately after turning ON
the power supply.
The system is in preparation
mode of operation.
Wait for a period of
approximately 10 minutes.
The remote controller
displays CENTRAL
CONTROL; no cooling or
heating operation is
performed.
Switch to fan operation.
In thermal storage operation,
the unit is set to fan operation in
cooling or heating operation,
and the remote controller
shows CENTRAL CONTROL.
Normal operation.
8 The airflow rate
is not
reproduced
according to the
setting.
Even pressing the airflow
rate setting button makes no
changes in the airflow rate.
In heating operation, when the
room temperature reaches the
set degree, the outdoor unit will
stop while the indoor unit is
brought to fan LL operation so
that no one gets cold air.
Furthermore, if fan operation
mode is selected when other
indoor unit is in heating
operation, the system will
be brought to fan LL operation.
Normal operation.
9 The airflow
direction is not
reproduced
according to the
setting.
The airflow direction is not
corresponding to that
displayed on the remote
controller.
The flap does not swing.
Automatic control Normal operation.
Symptom Supposed Cause Countermeasure