6-3
Symptom
Checkpoint
Remedy
Cause
Power supply
of the controller
cannot be
turned on
R or T-phase is
open
Faulty power supply
(voltage drop)
Disconnection of
power cable
Faulty power plug
Disconnection of
fuse Fu5 circuit
Faulty transformer
Is the fuse Fu5 circuit
disconnected?
Is the voltage at CN5
of TB1 20 V or less?
*
R or T-phase is open
*
Faulty power supply
(voltage drop)
*
Disconnection of power cable
*
Faulty power plug
Replace the fuse Fu5
NO
Replace the transformer TrC
Replace the controller
Is the voltage
of three-phase power supply on the
primary side of the circuit breaker
300 V or less?
NO
NO
YES
YES
YES
Defrost (normal)
The
compressor
does not
operate
Disconnection of
fuse Fu1 circuit
Faulty controller
Faulty PT/CT board
Is the fuse Fu1 circuit
disconnected?
Replace the fuse Fu1
NO
Replace the controller or
PT/CT board
YES
A. Unit
operates but
soon stops
(full stop)
E101, F101,
E103, E105,
E107, E109,
F109
See the Alarm
Code table
───
───
B. Evaporator
fan runs, but
condenser
fan and
compressor
do not run.
Thermo OFF
(normal)
───
───
C. Compressor
runs, but
condenser fan
and evaporator
fan do not run.
───
───
Ⅰ
Unit does not operate
Ⅱ
Unit operates but soon stops
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