Daikin VRV EMERION RXYQ-AATJA, Service Manual

Page: 354 / 429

Troubleshooting by Error Code SiUS342303E
347 Part 6 Service Diagnosis
Indication after
la u nch test
operation?
U4-03
The PCB of indoor u nits
displaying U9 are normal.
Check for indoor u nits of
other systems to tro ub leshoot
them according to rele v ant
error codes.
NO
YES
Check controller indoor u nits :
(1) Some error a b o u t
thermistor, or fan motor
(M1F, M2F), electronic
expansion
v al v e, or
defecti v e PCB.
(2) Test operation was
interr u pted b y the MODE
(BS1) bu tton.
YES
Check all indoor error
indication.
NO
Operate all indoor u nits.
YES
Do all u nits display U9 ?
Carry o u t the diagnosis again
after a lapse of 2 min u tes or
more.
NO
Did 2 min u tes or more
elapse after U9 is
displayed?
Are the
indoor-o u tdoor
and o u tdoor-o u tdoor
transmission wirings
normal?
Disconnect
the o u tdoor-o u tdoor
transmission wiring.
Does the system normally
operate with a single
transmission
line?
Modify the transmission
wirings.
Replace the o u tdoor u nit main
PCB (A1P).
Mo u nt the DIII-NET extension
adaptor.
NO
NO
YES
YES
A