Daikin R-410A Service Manual page 175

ESIEN05-04
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Part 3 – Troubleshooting
YES
Is the unit
in defrost mode?
NO
Measure the temperature of
suction air and supply air.
Temperature difference =
Suction air temp. – Supply air
temp.
Temperature
YES
difference for heating
should be between 14
and 30˚C.
NO
Is the operation
YES
current less than specified
level?
NO
Does indoor
YES
unit air flow
rate down?
NO
Is the level
YES
of high pressure lower
than normal level?
NO
∗ Insufficient compression of
compressor
∗ Insufficient circulation of
refrigerant
∗ Faulty expansion valve
Does the
YES
heat load increase after
installation of the
unit?
NO
∗ Incorrect selection of model
∗ Affection of sunlight
∗ Affection of excessive fresh
air into room
Gas shortage possibly
generates trouble.
∗ Clogged air filter
∗ Soiled heat exchanger
∗ Malfunction of indoor fan
motor (Refer error code "A6")
∗ Refrigerant overcharge
∗ Soiled heat exchanger
∗ Short circuit of discharge air
∗ Disturbing item in air flow
∗ Malfunction of fan motor of
outdoor unit
(Refer error code "E7", "H7")
Troubleshooting
Wait for a while.
No abnormality
No abnormality
Additional unit installation
should be considered
After vacuum drying, charge
correct amount of refrigerant.
Check each item
Check each item
Check each item
(S1995)
3–13
1
3 3
4
5