Hitachi FS3 Series, Service Manual

Page: 18 / 240

1
10
TROUBLESHOOTING
1.1.7 ABNORMALITIES OF DEVICES
Phenomenon Cause Check Item
Action
(Turn OFF main switch)
Disconnected
Coil
Measure coil resistance by
tester
Failure of
Indoor Unit
Fan Motor
Burnt-Out
Coil
Measure insulation
resistance
Replace Indoor unit fan
motor
Disconnected
Coil
Measure coil resistance by
tester
Failure of
Outdoor Unit
Fan Motor
º
Burnt-Out
Coil
Measure insulation
resistance
Replace outdoor unit fan
motor
Failure of
Magnetic
Switch for
Outdoor Unit
Fan Motor
Insufficient
Contacting Measure voltage between
contacting parts
Replace PCB for outdoor
unit
Failure of Comp. Motor
Measure resistance
between two wires
Failure of Comp.
Check for abnormal sound
from Comp.
Replace compressor
Failure of
Magnetic
Switch for
Comp.
Insufficient
Contacting Check magnetic switch
activates correctly or not
Replace magnetic switch
Disconnec-
ted Wiring
to PCB
Check connections Correctly connect wiring
"RUN" light is
ON and LCD is
indicated.
However, the
system does
not operated.
(ex.The indoor,
outdoor fans or
compressor
does not
operate.)
Failure of
One of
PCBs
Failure of
PCB
Check PCB by self-
checking *1).
Replace PCB if failed
Failure of
Thermistor
Failure of Air
Inlet
Thermistor Disconnec-
tion of
Thermistor
Abnormality of Remote Control
Switch Cord
Check it by self-checking
*2).
Replace or correctly
connect wires if
abnormality exists
The Comp.
does not Stop
or Start even if
the Setting
temperature on
LCD is
Changed *3)
Failure of Indoor Unit PCB
Check it by self-checking
*1)
Replace PCB if failed.