6-1
6. TROUBLESHOOTING
6.1 Refrigeration system and electrical system
If the unit does not work properly, refer to the following table to find causes of trouble and provide
appropriate measures.
Symptom
Checkpoint
Remedy
Cause
D. Condenser
fan and
compressor
run, but
evaporator fan
does not run.
Faulty electrical
system of evaporator
fan
・
CTP activation
・
Motor burnt out
(disconnection)
・
Disconnected coil of
magnetic contactor
External factor
E. Compressor runs,
but evaporator fan
and condenser
fan do not run.
Not malfunction
(defrost)
Controller display
E205 (Faulty 1 unit of EFM)
E803 (Faulty 2 units of EFM)
↓
・
Motor coil resistance
・
Ensure that the magnetic contactor is turned ON
・
Voltage on secondary side of magnetic contactor
(three-phase)
Visual check for foreign matters caught in
and deformation
(including relevant parts such as controllers)
Check the lighting status of LED
(red) of DEF on control panel
A. Neither
evaporator
fan,
condenser
fan nor
compressor
runs.
Faulty power supply
Failure in running of
condenser fan
Controller
B. Evaporator fan runs,
but condenser fan and
compressor do not run.
Not malfunction
(thermo-OFF
status)
C. Evaporator fan
and compressor
run,but
condenser fan
does not run.
Not malfunction (high
pressure control)
External factor
Check the power supply
Check the power supply plug
Check for disconnection of
cable
The unit is normal if the
condenser fan is
stopped while the HPT
is 1000 kPa or more
Replace faulty device
Turn the switch ON
See the instructions for alarm code
of electronic controller in section 6.2
Replace the Fu
Replace faulty device
Replace the
transformer
See the alarm code
when ALARM is issued
Refer section 6.2
Remove foreign matters
・
Replace the fan
motor
・
Replace the magnetic
contactor
Remove foreign matters
Voltage on primary side of circuit
breaker
It should be within the voltage range
shown in page 1-1.
Ensure that the condenser fan is stopped
while high pressure is under control.
(Increase the high pressure
compulsorily, and make sure that the
condenser fan stops when the HPT is
1000 kPa or more.)
Megger check on secondary side of
magnetic contactor
(Evaporator fan motor, condenser
fan motor, compressor)
Unit switch ON/OFF check
Alarm presence (F code)
Check for disconnection of Fu1 (fuse)
Check for malfunction in object
models shown in section 7.9
Check for disconnection on secondary
side of transformer (Tr)
Connector type terminal board: Check
of 24V between lead wires 101 and 104
Display of controller
(ALARM display)
Check of operation of HPT (E101)
by controller display
Visual check for foreign matters caught in
and deformation
(including relevant parts such as controllers)
Secondary side of
power supply
transformer
Ⅰ
Unit does not operate
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