Daikin SkyAir RZR-TA Series Service Manual page 207

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