Hitachi RWM-(H)FSN3E, Service Manual

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12 Troubleshooting
SMGB0070 rev. 1 - 08/2011
367
12
Alarm code
38
Abnormality of Protective Circuit for Protection (Outdoor Unit) (RAS-2HVRN2)
• 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 in-
verter 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.
DC 12V detected?
Check wiring other
than on DIP-IPM
*1)
Yes
Faulty DIP-IPM
Replace E-box
Voltage detected DIP-
IPM is normal
No
Place [+] of tester to Pin #1
of PCN401 and [-] to Pin #3
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Faulty DIP-IPM
Check DIP-IPM by
seft-checking
Replace DIP-IPM
*1): This alarm (Alarm Code: 38) may appear when the operation is started, if the Faston terminal of the high pressure
switch (63H1) is improperly connected or damaged (open-circuit fault). See also
Alarm Code: 02 Activation of Outdoor Unit
Protection Device .