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Symptom-based Troubleshooting
SiUS28-902_a
67
Troubleshooting
1. Symptom-based Troubleshooting
Symptom
Supposed Cause
Countermeasure
1
The system does not start operation at all.
Blowout of fuse(s)
Turn Off the power supply and
then replace the fuse(s).
Cutout of breaker(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.
Power failure
After the power failure is reset,
restart the system.
2
The system starts operation but makes an
immediate stop.
Blocked air inlet or outlet of indoor
or outdoor unit
Remove obstacle(s).
Clogged air filter(s)
Clean the air filter(s).
3
The system does not cool or heat air well.
Blocked air inlet or outlet of indoor
or outdoor unit
Remove obstacle(s).
Clogged air filter(s)
Clean the air filter(s).
Enclosed outdoor unit(s)
Remove the enclosure.
Improper set temperature
Set the temperature to a proper
degree.
Airflow rate set to "LOW"
Set it to a proper airflow rate.
Improper direction of air diffusion Set it to a proper direction.
Open window(s) or door(s)
Shut it tightly.
[In cooling] Direct sunlight received
Hang curtains or shades on
windows.
[In cooling] Too many persons staying in a
room
[In cooling] Too many heat sources (e.g. OA
equipment) located in a room
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 TEMP ADJUST
button immediately resets the
system.
The remote controller displays
"UNDER CENTRALIZED
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 micro computer
operation.
Wait for a period of approximately
one minute.
5
The system
makes
intermittent
stops.
The remote controller displays
malfunction codes "U4" and
"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.
ON
OFF
Knob
Tripped
Circuit breaker
Summary of Contents for SkyAir FCQ18PVJU
Page 1: ...Split System Air Conditioners SkyAir Inverter R 410A Heat Pump 60Hz P Series SiUS28 902_a...
Page 44: ...Other Control SiUS28 902_a 37 Function...
Page 81: ...SiUS28 902_a Troubleshooting by Remote Controller Troubleshooting 74...
Page 185: ...SiUS28 902 Precautions for New Refrigerant R 410A Precautions for New Refrigerant R 410A 178...