Hitachi UTOPIA RAS-4HVRP2E - Page 269

10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
267
10
Alarm code
06
AbnormalInvertervoltage(Insufcientinvertervoltageorovervoltage)
• Thealarmcodeisashedonthe7-segmentdisplayoftheoutdoorunit.
• The alarm code is displayed on the wired controller of the indoor unit.
Ifeitherinsufcient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
Is the power supply voltage within the
range of ± 10% of the rated voltage?
Is the power supply voltage higher
than 85% of the rated voltage during
operation?
Check the power supply voltage and
remove the fault to avoid the voltage
too low or too high
Is there any other high-power
equipment start during the
operation? Is the power voltage
higher than 85% of the rated
voltage?
Is the power indicator is light on
when the main relay indicator is ON?
Check if the wiring of reactor is loose?
Fasten the wiring
Replace the damaged driver board or fan
motor driver board if faulty
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No