Symptom-Based Troubleshooting; General Troubleshooting - Daikin VRV EMERION RXYQ-AATJA Service Manual

SiUS342303E

1. Symptom-based Troubleshooting

1.1

General Troubleshooting

Symptom
1 The system does not start operation at all.
2 The system starts operation but makes an
immediate stop.
3 The system does not cool or heat air well.
4 The system does The system stops and
not operate. immediately restarts 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 displays
makes error codes U4 or U5, and the
intermittent stops. system stops but restarts after
a lapse of several minutes.
Part 6 Service Diagnosis
Supposed Cause
Blowout of fuse(s)
Cutout of breaker(s)
Power failure
The connector loose or not fully
plugged in
Blocked air inlet or outlet of indoor or
outdoor unit
Clogged air filter(s)
Blocked air inlet or outlet of indoor or
outdoor unit
Clogged air filter(s)
Enclosed outdoor unit(s)
Improper set temperature
Airflow rate set to LOW
Improper direction of air diffusion
Open window(s) or door(s)
IN COOLING
Direct sunlight received
IN COOLING
Too many persons staying in a room
IN COOLING
Too many heat sources (e.g. OA
equipment) located in a room
IN DRYING
The reason is that the dry operation
serves not to reduce the room
temperature where possible.
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.

Symptom-based Troubleshooting

Countermeasure
Turn OFF the power supply and then
replace the fuse (s).
• If the knob of any breaker is in its
OFF position, turn ON the power
supply.
• If the knob of any circuit breaker is
in its tripped position, do not turn ON
the power supply.
ON
Knob
Tripped
OFF
Circuit breaker
After the power failure is reset, restart
the system.
Turn off the power supply to verify the
connection of the connector.
Remove obstacle(s).
Clean the air filter(s).
Remove obstacle(s).
Clean the air filter(s).
Remove the enclosure.
Set the temperature to a proper
degree.
Set it to a proper airflow rate.
Set it to a proper direction.
Shut it tightly.
Hang curtains or shades on windows.
The model must be selected to match
the air conditioning load.
Change the system to cooling
operation.
Normal operation. The system will
automatically start operation after a
lapse of five minutes.
Operate the system using the
COOL/HEAT central 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.
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