Hitachi YUTAKI Series - Page 217

215
Troubleshooting procedure
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7
 
,b

• Thisalarmisindicatedwhentherevolutionpulseoutputfromthefanmotoristhereverserevolutionsignalisdetected.
Thefanmotorisstoppedonce,andrestartedafter10seconds.Ifitoccursmorethan10timesin30minutes,this
alarm is indicated.
 

MF1
b
MF2

note
Check to ensure that DC Fan Motor is checked according to the -
section "Fault diagnosis of DC fan motor".
In the case that the fan motor does not run
eventhePCB1isreplaced,replacefaninverter
PCB(PCB4,5).
Yes
This alarm is indicated due
to detected overcurrent by
the contrary wind. This is
normal.
Doesthemotorrun?
Check the connector connection
of CN14 and CN15 (on PCB1) and
CN201,CN202,PCN201,PCN203(on
PCB3,4).
Faulty
Restart operation
No
Alarm code is not indicated
Aretheconnectorsabnormal?
Connect it correctly.
Restart operation
Doesthemotorrun?
This is normal
Replace the fan motor
Restart operation
Doesthemotorrun?
Yes
Good
This is normal
Yes
No
Alarm code is not indicated
Replace the PCB1
No