Hitachi EV-1.5N1, Service Manual

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8. Troubleshooting
194
SMGB0079 rev.0 - 01/2013
8.2.3 Troubleshooting by alarm code for the outdoor and indoor units
Alarm code
01
Activation of the safety device in the indoor unit
• 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.
- This alarm code is displayed when the contact between #1 and #2 of CN14 is not closed over 120 seconds during
the cooling process, the heating process or the fan operation.
Is DC12V applied between #2 of CN14
and GND?
Activation of Float Switch (FS)
or Incorrect Wiring
Faulty I.U. PCB
Yes
No
Indication of Outdoor Unit PCB
Indoor Unit No.
for Malfunction
Alarm Code
Phenomenon Cause Check item
Action
(Turn OFF the main
switch)
Activation of the float
switch
High Drain Level Clogging of the drainage Check the drain pan
Remove the clogged
foreign particles
Faulty float switch
Fault
Check the continuity when
the drain level is low
Replace the float switch
if faulty
Faulty contacting
Measure the resistance by
means of the tester
Fix the looseness and
Replace the connector
Faulty connection Check the connections Repair the connection
Faulty indoor unit PCB
Check PCB by means of
the self-check mode *1)
Replace PCB if faulty
N O T E
• *1): Refer to section Self-checking procedure of PCB by means of the Remote Control Switch in this chapter.
•
Alarm code “01” is not displayed at the RPK series.