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 Fu6 circuit
Faulty transformer
Is the fuse Fu6 circuit
disconnected?
Is the voltage at CN1
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 Fu6
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)
Refer the Alarm list
(page 3-26)
───
───
B. Evaporator
fan runs, but
condenser
fan and
compressor
stop soon.
Thermo OFF
(normal)
───
───
C. Compressor
runs, but
condenser fan
and evaporator
fan stop.
───
───
Ⅰ
Unit does not operate
Ⅱ
Unit operates but soon stops
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