Daikin R71FUV1 Service Manual page 49

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