Symptom-based Troubleshooting
SiBE281013
92
Service Diagnosis
Troubleshooting
Normal.
Additional unit installation
should be considered.
YES
YES
YES
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Measure the temperature of suction
air and discharge air. Temperature
difference = Suction air temp. –
Discharge air temp.
Possible causes as follows
* Insufficient compression of
compressor
* Insufficient circulation of refrigerant
* Defective electronic expansion valve
Possible causes as follows
* Incorrect selection of model
* Affection of direct sun
Check the each section.
* Clogged air filter
* Soiled heat exchanger
* Defective fan motor
(Refer to troubleshooting “
A6
”.)
Check the each item.
Check the each item.
Possible causes as follows
* Refrigerant overcharge
* Air in refrigerant system
* Soiled heat exchanger
* Short circuit of supply air
* Disturbing item in airflow
* Defective fan motor of outdoor unit
(Refer to troubleshooting “
E7
”.)
Refrigerant shortage possibly
generates trouble.
NO
NO
NO
YES
NO
NO
YES
YES
NO
After vacuum drying, charge
correct amount of refrigerant.
Temperature
difference for cooling should be
between 8 and 18˚C.
Does
any frost
generate around inlet
port of indoor unit heat exchanger
or outlet port of electronic
expansion
valve?
Does the heat
load increase after installation
of the unit?
Is the
operation current less than
specified level?
Does indoor unit
airflow rate down?
Is the
level of high pressure higher
than normal level?
