Hitachi UTOPIA RAS-4HVRP2E - Page 297

10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
295
10
Alarm code
57
Abnormality of Fan Motor
• 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 the revolution of the fan motor is less than 10rpm in 10 seconds after the fan motor starts operation, the fan motor
stops. The fan motor restarts operation automatically after 10 seconds (During this, the compressor continues to
operate).Ifthisoccursagainninetimesinthenextveminutes,thisalarmcodeisdisplayed.Thisalarmiscausedby
locking or electrical abnormality of the fan motor.
Yes
Yes
Yes
No
No
Restart operation
Does fan motor run when
inverter failure occurs?
Is the power supply voltage higher
than 85% of the rated voltage during
operation?
Turn OFF power supply and check if
the fan blade rotates smoothly
Turn OFF outdoor
unit power supply and
disconnect compressor
and fan motor wiring.
Short circuit TCN10 (FCT)
connector.
Does it fail?
Check the power supply voltage, remove
the fault to avoid the voltage too low or
too high
Yes
No
Fan motor damaged, replace fan motor
Check if there are any obstacles.
Replace the fan motor if it is damaged.
Check fan
motor if wiring
is normal
Replace driver
of fan motor
Replace fan
motor
Replace driver
of fan motor
No
No
Yes
Yes