Technical Information

Troubleshooting
TCGB0079 rev.0 - 01/2013
148
11.1 On-screen displays during abnormal operation
Abnormal operation can be produced due to the following reasons:
• Malfunction
The RUN (red) indicator ashes.
The ALARM indicator appears on the liquid crystal display.
The screen also displays the following items:
- A: indoor unit address.
- B: Refrigerant cycle number.
- C: Alarm code.
- D: Model code.
- E: If there are various indoor units connected, the above mentioned informa-
tion is shown for each one of them.
Write down the indications and contact your HITACHI service supplier.
• Power supply failure.
All displays disappear.
If the unit stops due to a power shortage, it will not start again, even though the power
comes back on. Carry out the start-up operations again.
If the power failure lasts less than 2 seconds, the unit will start again automatically.
• Electrical noise
The displays can disappear from the screen and the unit can stop. This is because the
microcomputer has been activated to protect the unit from electrical noise.
N O T E
Ifthewirelessremotecontrolisusedforthewall-typeindoorunit,removetheconnec-
tors(CN25)thatareconnectedtotheindoorPCB.Otherwisetheunitwillnotwork.
Thestoreddatacannotbeerasedunlesstheremotecontrolisinitialised.
A
B
C
C
D
E
(PC-ART example)
Model code
Indication Model
H
Heat pump
P
Inverter
F
Multi (SET-FREE)
C
Cooling only
E
Other
b
IVX, individual operation
L
KPI
11.1.1 PC-ARF Troubleshooting help menu
PC-ARF remote controller have a Troubleshooting function in Help Menu.
Make sure that the troubleshooting is read carefully before requesting for repairs.Select “Troubleshooting” from the help
menu and press “OK”. The list of troubleshooting will be displayed.
TCGB0079_rev0_11-2012.indb 148 29/01/2013 14:27:45