Nobu NBFS-48IDU Service Manual page 35

FC 11
FD 13
FH 14
P1 light
P2 light
P3 light
P4 light
light compressor drive fault
light Phase fault
Outdoor DC fan fault
light
The evaporator temp.
1
protection
overheat, over current
2 protection of inverter
module
3 AC input current over
large protection
The discharge temp. of
4
compressor protection
components or integrated circuit is damaged,
the electric control board should be replaced.
1、Power on again, and check the operation of the
compressor is normal.
2、Check whether the connection of the
compressor is reliable, otherwise repair.
3、Check whether the components on the electric
control board have been damaged, if they are
damaged, the components or the electric
control board should be replaced.
1、 check whether power wire of phase is correct
2、 check outdoor of PCB whether fault
1 check whether the system pressure is normal,
whether to have the broken tube result in the
leakage of refrigerant.
2 check whether the indoor coil temperature
sensor is installed in place.
3 check whether the four-way valve runs
abnormally.
1、Check whether the filter of indoor unit is too
dirty, and it should be cleaned when it is too
dirty.
2、Check whether it has barrier around
indoor unit, it should be remove if it has.
3、 Check whether the indoor motor is damaged, it
should be replaced motor or electrical control
board when it is damaged.
1、Check whether the fixation between the IPM
module and the radiator is firm.
2、Check whether the compressor is well,
otherwise replace it.
3、 Check whether the IPM module is abnormal,
otherwise replace it.
1、Check whether the ambient temperature
exceeds the operation range for the air
conditioner
2、Check whether the current detection circuit is
abnormal, the electric control should be
replaced when it is abnormal.
1、Check whether the air condition system and
pressure are normal.
2、Check whether the sensor, connecting wire of