Pump Runs, But Neither Fan Nor Compressor Run; Pump And Compressor Run, But Fan Does Not Run; Pump And Fan Run But Compressor Does Not Run; Unit Stops During Cooling Operation - Hitachi RCUE40AG1-400AG1 Service Manual

TROUBLESHOOTING
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Printed Circuit Board
Pump runs,
but neither
fan nor
compressor
run.
Fan Magnetic Contactor
Failure (Cooling
Operation)
Pump and
compressor
run, but fan
does not run
Printed Circuit Board
Pump and
Compressor Magnetic
fan run but
Contactor Failure
compressor
does not run.
Discharge pressure is
excessively high, so that
Unit stops
high pressure switch
during
activates.
cooling
(C1-H1)~ (C6-H6)
operation
Discharge gas control is
activated
Wiring Connection Failure
Failure
Printed Circuit Board
Remote Control Switch Failure
Coil Broken
Contact Point Failure
Fan Motor Failure
Wiring Connection Failure
Printed Circuit Board
Failure
Thermistor Malfunction
Coil Breaking
Contact points Failure
Thermostat is activated. (Thermo-Off)
Compressor Motor Failure
Compressor Failure
Voltage at starting up is low.
Insufficient air in air side
heat exchanger
Air temperature through air
side heat exchanger is
excessively high
Refrigerant excessive
Non-condensable gas in
the refrigerant cycle
High pressure pipe
Expansion Valve clogging
Check Valve (Air side heat
exchanger side) clogging
Strainer Clogging
Chilled water inlet
temperature of Water side
heat exchanger is
excessively high
Suction gas temperature is
excessively high
(Excessively super heat)
Check circuit by tester
Check circuit by tester Check
Printed Circuit Board by self-
Failure
checking function
Operative by the unit side
Check circuit by tester
Measure the voltage between
contact points of magnetic
Measure the interphase
Check circuit by tester
Failure
Measure the thermistor resistance
Check circuit by tester
Measure the voltage between
contact points of electromagnetic
Change water temperature or
change the setting temperature.
Measure the interphase
Beat noise from compressor
Measure the voltage
Excessive dust in air side heat
Inlet or outlet of air side heat
exchanger is clogged
Shortage of Service Space for
Reverse Rotation of Fan Motor
Air Short Circuits in Chiller Unit
Another heat source around
Check cycle temperature.
charge
Turn off the unit and check the
relation between water
temperature and pressure.
clogging
Check clogging
Check the difference of
temperature before and after of
Confirm if it is within the working
Gas leakage or refrigerant
Repair the wiring
Replace Printed Circuit
Replace remote
Replace magnetic
contactor.
Replace fan motor
resistance
Repair the wiring
Replace thermistor
Replace magnetic
contactor
resistance
Replace compressor
Consult with electric
power company
exchanger
Secure the service
Chiller Unit
Change wiring for fan
Remove short-circuits
Remove heat source
chiller unit
quantity of refrigerant
Charge refrigerant
Check clogging
Remove clogging, or
replace check valve
Replace or clean the
strainer.
Check the status of
heat load in detail and
range
take a countermeasure
quantity of refrigerant
shortage after checking gas
connection
Board
control switch.
contactor.
connection.
contactor
It is not failure
Remove it.
space
motor
Charge correct
again after the
evacuation
strainer
Charge correct
leakage