Daikin R71FUV1 Service Manual page 52

Symptom-based Troubleshooting
Troubleshooting
Caution
Is the unit
in defrost mode?
NO
Measure the temperature of suction air and
discharge air.
Temperature difference = Discharge air temp.
– Suction air temp.
Temperature
difference for heating
should be between
14 and 30˚C.
NO
Is the
operation
current less than
specified level?
NO
Does
indoor unit airflow
rate decrease?
NO
A
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
YES
YES
Does the
heat load increase
after installation of the
unit?
• Wrong selection of
model
• Affection of excessive
fresh air into room
YES
YES
YES
NO
Si20-701_B
Wait for a while.
Normal
Normal
Additional unit
installation
should be
considered.
Refrigerant
shortage possibly
generates
trouble.
After vacuum
drying, charge
correct amount of
refrigerant.
Check the each
item.
• Clogged air
filter
• Soiled heat
exchanger
• Defective
indoor unit fan
motor
(Refer to
troubleshooting
"A6")
45