Hitachi RAS-(3-6)HVNC1(E) Service Manual page 234

8 Troubleshooting
01
Alarm code
Is alarm code "01" indi-
cated on LCD or 7-seg-
ment of O.U. PCB?
02
Alarm code
This alarm is indicated when one of safety devices is activated during compressor running.
-
Is it connected to connector
PCN401 of PCB1?
Is there the continuity between termi-
nal #1 and #3 of connector PCN401
during operation stop? (Y52C: OFF)
Yes
Faulty PCB
220
SMGB0087 rev.0 - 12/2013
Activation of the safety device (flow switch) in the indoor unit (RPK only)
Indication of Outdoor Unit PCB
Yes
Is DSW2-1P on O.U.
No
Activation of the safety device (high pressure switch) in the outdoor unit
(Except Alarm codes 41 and 42) (For RAS-(2/2.5)HVNP1 and RAS-3HVNC1)
No
Yes
No
Alarm code
Indoor Unit No.
for Malfunction
Yes
PCB ON?
No
Is faston terminals
for PSH connected
to PSH correctly?
Yes
Faulty O.U.
PCB1
Turn OFF the power
source and then turn
OFF DSW2-1P on O.U.
PCB
Failure of I.U PCB or
disconnection of wir-
ing between PCB1 and
PCB2
Plug connector correctly
Plug faston terminals to
PSH correctly
Check activation of the follow-
ing safety devices. Remove
the cause after checking.
PSH: 4.15MPa (R410A)