Hitachi mini-HNRQ1 Series Service Manual page 85

TROUBLESHOOTING
Alarm
06
Code
● The alarm code is flashed on the 7-segment display of the outdoor unit.
● The alarm code is displayed on the wired controller of the indoor unit.
★ If either insufficient voltage or overvoltage is detected between the terminal R-S on the inverter PCB (Driver
Board) three times in 30 minutes, the operation stops and this alarm code is displayed. If this occurs less than
three times in 30 minutes, the operation is automatically retried.
Start Operation
Yes
Is the power supply voltage
within the range of ± 10% of
the rated voltage?
Yes
Is the power supply
voltage higher than 85%
of the rated voltage
during operation?
Yes
Is there any other high-
power equipment start
during the operation? Is
the power voltage higher
than 85% of the rated
voltage?
Yes
Is the power indicator is
light on when the main
relay indicator is ON?
Yes
Abnormal Inverter Voltage
(Insufficient Inverter Voltage or Overvoltage)
No
No
No
No
Check if the wiring of
reactor is loose
Replace the damaged driver
board or fan motor driver
board if faulty.
Yes
No
78
Check the power supply
voltage and remove the
fault to avoid the voltage
too low or too high.
Fasten the wiring.