Hitachi YUTAKI Series - Page 173

171
Initial troubleshooting
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7
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  



Over current compressor
Failure compressor
bearing
Check bearing seal state Replace the compressor
Failure in the compressor
motor insulation
Check insulation
resistance
Replace the compressor
(option "replace the
insulation")
Failure current sensor for
compressor
Check the connector
Repair the wiring
connection or replace
the current sensor
Blown out fuse at the
pump circuit
Blocked pump
Check if there exist any
solidparticle,oricedwater
Chemical cleaning of the
foreign particle
Failure of the magnetic
contact of the pump
Check the magnetic
contact
replace the magnetic
contact
A lot of ice is attached on
the airside
(heating mode heat
exchanger)
Automatic defrost is de-
activated
Failure of the thermistor
Measure the resistance of
the thermistor
Replace the thermistor
Failure of the 4-way valve
Check the activation 4-way
valve
Replace the 4-way valve
Short circuited
Check obstacles around
the unit
Remove the obstacles
Failure of the low pressure sensor
Check the display
pressure and actual
pressure
Remove the low
pressure sensor
Unit is in ice condition -
Perform manual
defrosting
Unit is stopped by highcut
in defrost operation
Failure of high pressure sensor
Check the pressure &
actual value of the high
pressure sensor
Replace high pressure
sensor