Hitachi RAS-2-HVNP Service Manual page 240

8. Troubleshooting
38
Alarm code
• The RUN LED flickers and "ALARM" is displayed on the remote control switch.
• The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit
number and the alarm code are displayed on the display of the outdoor unit PCB.
- The alarm code appears if approx. DC12V is supplied to the DIP-IPM connector (see table below) when the inverter
operation is commanded (after five 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.
RAS-(2-2.5)HVNP / RAS-3HVNC
RAS-(3-6)H(V)N(P/C)E / RAS-(8-12)HN(P/C)(E)
• The alarm code appears if AC 200V or AC 240V is supplied to the connector on the outdoor unit PCB (see table below)
while Y52C is OFF or CMC1 is open.
Connector
Pin No.
Phenomenon
Faulty DIP-IPM
N O T E
This alarm may appear if the Faston terminal of the high pressure switch (63H1) is improperly connected or da-
maged (open-circuit fault) when the operation is started. Besides this, check also "Alarm Code: 02 Activation of
Outdoor Unit Protection Device".
226
SMGB0079 rev.0 - 01/2013
Abnormality of Protective Circuit for Protection (Outdoor Unit)
Connector No.
for Check
PCN9
#1 and #3
Cause Check item
Check DIP-IPM by seft-checking
Action
(Turn OFF Main Switch)
Replace DIP-IPM