[8-9 Troubleshooting Problems with Major Components on BC Controller ]
Troubleshooting Problems with Major Components on BC
Troubleshooting flow chart for pressure sensor
Check whether the pressure sensor or the
connectors of P1 and P3 are connected,
Operating at the moment?
On the self-diagnosis monitor, measure
Outdoor high-pressure 63HS1
Outdoor low-pressure 63LS
BC controller pressure P1 (liquid side)
and P3 (intermediate part)
Check whether the result is
All the compressors of the outdoor units to
which the BC controller is connected are stopped.
10 minutes or longer after
the operation stops?
Check P1 and P3 on the self-diagnosis
LED, and check that the detected
pressure is 0.098MPa [14psi] or less.
Check that the difference between each
detected pressure is 0.098MPa [14psi] or less.
Both the board and the pressure sensor are normal.
Check whether the refrigerant pipe and the
transmission line are connected correctly
between the indoor unit and the BC controller.
Repair the fault.
Check whether the refrigerant pipe
and the transmission line are
connected correctly between the indoor
unit and the BC controller.
Fix the relation between the
refrigerant piping and the
- 277 -
Fix the relation between
the refrigerant piping
and the transmission line.
Check whether the contact of the pressure
sensor connector in trouble is not faulty.
Remove the pressure sensor connector
from the board, and check the pressure.
Pressure 0MPa [0psi]
Short-circuit between connecter pins #2 and #3
on the circuit board, and check the pressure.
6MPa [870psi] pressure
or more is displayed.
Replace the pressure sensor, which detects
less than 6MPa [870psi] pressure, with the
pressure sensor, which detects 6MPa [870psi]
or more pressure, check the pressure, and
check whether the detected pressure is
Replace the pressure sensor.
Restore contact failure.
Replace the board.