11 Troubleshooting
On-screen displays during abnormal operation
TCGB0136 rev.1 - 05/2021
118
11.1 On-screen displays during abnormal operation
Abnormal operation can be produced due to the following reasons:
• Malfunction
TheRUN(red)indicatorashes.
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
information 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.
? NOTE
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.
B
A
SEL. OP MODE
MODEL : b .02
Alarm Code:
22
01-02
ALM RST
ADDR
ENT.
OK
C
E
D
(PC-ARFP1E example)
Model code
Indication Model
H
Heat pump
P
Inverter
F
Multi (SET-FREE)
C
Cooling only
E
Other
b
Prime and IVX Prime
L
KPI
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