Hitachi RAS-(4-12)HNP(1)(E) - Abnormality of Protective Circuit for Protection (Outdoor Unit)

8 Troubleshooting
253
SMGB0087 rev.0 - 12/2013
8
Alarm code
38
Abnormality of Protective Circuit for Protection (Outdoor Unit)
RAS-(2-2.5)HVNP1 / RAS-3HVNC1
- The alarm code appears if approx. DC12V is supplied to the DIP-IPM connector when the inverter operation is
commanded (after ve seconds following activation of the remote control switch).
Place the tester as shown in the diagram below to check the connector of PCN401. The connector shall remain inserted.
DC12V will constantly be detected and disturb the diagnosis if the connector of PCN401 is pulled out.
DC 12V is detected?
Check wiring other than on
DIP-IPM (Note 2)
Yes
Faulty DIP-IPM.
Replace electrical box.
No
Voltage detected
DIP-IPM is nor-
mal
Place [+] of tester to pin number 1 of
PCN401, and [-] to pin number 3.
RAS-(3-6)H(V)N(P/C)1E / RAS-(8-12)HN(P/C)(E)
The alarm code appears if 1~ 230V is supplied to the connector on the outdoor unit PCB while Y52C (compressor relay
opened) is OFF or CMC1 (magnetic contactor for compressor is open.
Is 1~ 230V applied
between PCN9 number 1
and 3 during
stoppage?
Faulty OU PCB1
No
Check wiring connection
except OU PCB1
Yes
OU PCB1 is normal
Connector number for check
Connector PCN9
Pin number 1 and 3
Phenomenon Cause Check item
Action
(Turn OFF Main Switch)
Faulty DIP-IPM
Check DIP-IPM by
seft-checking
Replace DIP-IPM
N O T E
• This alarm may appear if the Faston terminal of the high pressure switch (63H1) is improperly connected or damaged
(open-circuit fault) when the operation is started. Besides this, check also Alarm Code: 02 Activation of Outdoor Unit
Protection Device.
• This alarm code may appear at the beginning of the operation if high pressure switch (PSH) is incorrectly connected
or fail (open fault). See also alarm 02.