Hitachi RAS-4-HNCE - Troubleshooting Procedure; Alarm Display

8. Troubleshooting
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SMGB0079 rev.0 - 01/2013
8.2 Troubleshooting procedure
8.2.1 Alarm display
On-screen displays during abnormal operation
• Malfunction
The RUN (red) indicator ashes.The ALARM indicator appears on the liquid crystal display.The screen
also displays the indoor unit number -A-, the alarm code -B- and the model code -C-. If there are various
indoor units connected, the above mentioned information is shown for each one of them -D-.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 sec-
onds, 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connectors(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



