Troubleshooting Procedure; Alarm Display; On-Screen Displays During Abnormal Operation - Hitachi RAS-(3-6)HVNC1(E) Service Manual

8 Troubleshooting
8.2 Troubleshooting procedure
8.2.1 Alarm display
On-screen displays during abnormal operation
• Malfunction
The RUN (red) indicator flashes. 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 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.
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SMGB0087 rev.0 - 12/2013
A
B
C
B
D