Abnormalities Of Devices - Hitachi FSG Series Service Manual

1
TROUBLESHOOTING
10
1.1.7

ABNORMALITIES OF DEVICES

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