Daikin FTX25JVEA9 Service Manual page 274

Si18-201
Troubleshooting
Service Diagnosis
1
Cooling
What operation
mode is applied?
Heating
Is stop valve open?
YES
Are
the heat
exchanger
intermediate
temperature and the
liquid pipe temperature in
the room with unit run excessively
close to the saturated
temperature equivalent
to the high
pressure?
NO
Does
the refrigerant
passing noise always
come from EVH of
BP unit?
NO
Does the
refrigerant passing
noise always come
from EVP?
NO
Does
the refrigerant
passing noise always
come from EVH of
BP unit?
NO
Is the gas
pipe in the room
with unit run frosted
resulting in the discharge
pipe temperature lower than
its target temperature
and in the minimum
opening of
EVn?
NO
Is the gas
pipe in the room
with unit stopped
frosted resulting in
the discharge pipe
temperature lower
than its target
temperature?
NO
Is the
suction pipe
temperature
abnormally
high?
NO
Does the
refrigerant passing
noise always come
from EVP?
Troubleshooting - Outdoor Unit Related
NO
YES
YES
YES
YES
YES
YES
YES
YES
Open the stop valve.
There is possibility of EVn
malfunction.
EVn connector connection
wrong
EVn coil disconnected
EVn clogged with dust,
defective
There is possibility of EVH
malfunction.
EVH coil disconnected
EVH clogged with dust,
defective
There is possibility of EVP
malfunction.
EVP coil disconnected
EVP clogged with dust,
defective
There is possibility of EVH
malfunction.
EVH coil disconnected
EVH clogged with dust,
defective
There is possibility of EVH
malfunction.
EVH coil disconnected
EVH defective
There is possibility of EVH
malfunction.
EVH coil disconnected
EVH defective
There is possibility of EVH
malfunction.
EVH coil disconnected
EVH clogged with dust,
defective
There is possibility of EVP
malfunction.
EVP coil disconnected
EVP clogged with dust,
defective
(MF019)
261