Hitachi RAS-18FSXN - Page 183

Alarm code
03
Abnormal transmission between the indoor and outdoor units, heat recovery system (3
pipes).
• The RUN indicator flashes and the ALARM indication is displayed on the remote control switch.
• The unit no., the alarm code and the unit code are alternatively displayed in the temperature setting section and the unit
no. and alarm code are displayed on the outdoor unit's PCB1 display.
* This alarm is indicated when an anomaly is maintained for 3 minutes after the normal transmission between indoor,
CH units and outdoor units, and also if the anomaly is maintained for 30 seconds after the microcomputer is automatically
reset.
The alarm is indicated when the abnormal transmission is maintained for 30 seconds from the start up of the outdoor
unit.
* Investigate the cause of the excessive current consumption and take the necessary measures when fuses are blown
or the circuit breakers for the outdoor unit are activated.
PCB1: Control PCB in Outdoor Unit
PCB: Indoor Unit PCB
PCB(1): CH Unit PCB
Is LED1 (red) on
PCB(1) ON?
Is LED3 (green) on
PCB(1) ON?
Yes
Yes
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NoNo
Check CH unit wiring.
Check wiring between
outdoor unit and indoor
units.
No
Is LED2 (yellow)
on PCB(1) flashing
more than once in
10 seconds?
No
Replace fuse.
Check other CH units.
Yes
Is the fuse for
PCB(1) melted?
Yes
Is voltage between
"L1" and "N" of
PCN1 on PCB(1)
220V or 240V?
Faulty PCB(1)
No
CH
Unit
Yes
Outdoor
Unit
Is LED3 (yellow)
on PCB1 ON?
No
No
Yes
Yes
Yes
Is DSW10-1P
(T
erminating Resistance)
on PCB1 ON?
Is LED3 (yellow)
on PCB1 flashing
more than once in
10 seconds?
Is LED1 (red) on
PCB1 ON?
Set it correctly
.
No
Remove terminals of
#1 and
#2 on TB2. *1)
Yes
Connect terminals of
#1 and
#2 on TB2.
Replace fuse.
No
Check the fuses of
outdoor unit power
suppl
y
.
Faulty PCB1
No
No
Is the fuse for
PCB1 melted?
Yes
Yes
Is the voltage
between faston terminal
"R1" and "" of PCB1
220V or 240V?
8 Troubleshooting
177
SMGB0065 rev. 1 - 12/2010
8