Troubleshooting
SiENBE28-901
96
Air Cooled Refrigeration Condensing Unit
Troubleshooting
A
No continuity of
fuse (FIU) on the
fan inverter PCB.
YES
NO
Unable to rotate the fan
manually with ease when
removing the connector of
the fan motor.
YES
NO
Resistance value between the
power supply wire terminal of fan
motor and the motor frame (metal)
is 1M
Ω
and below.
YES
NO
Check fan motor connector (power supply wire)
The resistance value between
UVW phases of fan motor is out of
balance, or short circuit between
UVW phases.
YES
NO
Check fan motor connector (signal wire)
The signal wire short
circuits between Vcc and
GND and between UVW
and GND.
YES
NO
Put the power supply ON to check the
following LED lamps.
1) HAP lamp on the compressor PCB (A3P)
2) HAP lamp on the fan inverter PCB (A4P)
HAP lamp for the A4P does
not blink on the condition
that HAP lamp for A3P is
blinking.
YES
NO
Replace fan inverter PCB.
Replace the corresponding
fan motor.
Replace the corresponding
fan motor.
Replace the corresponding
fan motor.
Replace the corresponding
fan motor.
Replace the fan inverter
PCB.
Replace the fan motor 2.