Si20-701_B Symptom-based Troubleshooting
42
Troubleshooting
YES
NO
NO
YES
Temperature
difference for cooling
should be between
8 and 18˚C.
Normal.
Additional unit
installation
should be
considered.
Refrigerant
shortage possibly
generates
trouble.
After vacuum
drying, charge
correct amount of
refrigerant.
Measure the temperature of suction air and
discharge air.
Temperature difference = Suction air temp.
– Discharge air temp.
• Wrong selection of
model
• Affection of direct sun
NO
YES
YES
YES
Check the each
section.
• Clogged air
filter
• Soiled heat
exchanger
• Defective fan
motor
(Refer to
troubleshooting
“A6”.)
Does
any frost
generate
around inlet port of
indoor unit heat
exchanger or outlet
port of electronic
expansion
valve?
NO
NO
A
Caution
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
Does
the heat load
increase after
installation of the
unit?
Is the
operation
current less than
specified level?
Does indoor
unit airflow rate
decrease?
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