Hitachi RAS-(4-12)HNP(1)(E) - Troubleshooting by Alarm Code for the Outdoor and Indoor Units

8 Troubleshooting
219
SMGB0087 rev.0 - 12/2013
8
8.2.3 Troubleshooting by alarm code for the outdoor and indoor units
Alarm code
01
Activation of the safety device (ow switch) in the indoor unit (except RPK series)
- 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.
Faulty IU PCB
Is DC12V applied
between #2 of CN14 and
GND?
Activation of oat switch
(FS) or incorrect wiring
No
Yes
Indication of Outdoor Unit PCB
Indoor Unit No.
for Malfunction
Alarm Code
Indoor unit number
for malfunction
Alarm code
Indication of outdoor unit PCB
If all the above checks have been overcome, see the status
of the following item:
• Check if oat switch (FS) connected to the CN14 is
open/activated by using a tester.
CN14: Safety devices line scheme
Phenomenon Cause Check item
Action
(Turn OFF the main
switch)
Activation of the oat
switch
High Drain Level Clogging of the drainage Check the drain pan
Remove the clogged
foreign particles
Faulty oat switch
Fault
Check the continuity
when the drain level is
low
Replace the oat 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 (except RPC)
Check PCB by means of
the self-check mode *1)
Replace PCB if faulty
Faulty wiring (RPC only)
Check wheather short-
circuited connector is
connected to CN-14)
Connect it correctly
N O T E
• *1): Refer to section “Self-checking procedure of PCB by means of the Remote Control Switch” in this chapter.