Nobu NBFS-48IDU, Руководство по обслуживанию

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7. Failure display
LED
running
lamp(flicker
times)
timer
lamp(flicker
times)
Fault content
The reason of fault and solution
F1 1 light communication fault
1
、
Check whether the connection of the outdoor
unit and indoor unit is one to one, otherwise
connect the L, N and communication line of
the indoor unit and outdoor unit one to one.
2
、
Measure whether the voltage between the zero
line and the communication line is 18V-30AC
half-wave signal, check whether the
communication circuit on the indoor and
outdoor electric control board has been
damaged, otherwise replace it.
3
、
Check whether the LED on the outdoor power
board has been on, otherwise replace the
electric control board.
4
、
Check whether the unit is abnormal caused by
the external interference, if it is, then find the
interfering source, and removes it.
F2 2 light
The indoor ambient
temp. sensor fault
1
、
Check whether the resistance of sensor is
normal, otherwise replace it.
2
、
Check whether the sensor wire is short circuit
or open circuit, and whether the plug is well
contacted, whether there is welding off or
rosin joint on the electric control board, repair
it if there is any above.
3
、
When the 1 and 2 are both normal, then the
components or integrated circuit is damaged,
the electric control board should be replaced.
F3 3 light
The coil pipe temp.
sensor of indoor unit
fault(include ：inlet,
middle, outlet)
1
、
Check whether the resistance of sensor is
normal, otherwise replace it.
2
、
Check whether the sensor wire is short circuit
or open circuit, and whether the plug is well
contacted, whether there is welding off or
rosin joint on the electric control board, repair
it if there is any above.
3
、
When the 1 and 2 are both normal, then the
components or integrated circuit is damaged,
the electric control board should be replaced.
F4 4 light indoor fan fault
1
、
Check whether the contact of the plug of the
motor wire and socket is well, making sure
well contact.
2
、
Check whether the indoor motor has damaged,