- 21 -
4-2-3 E-21
YES
NO
NO
YES
NO
YES
NO
Sensor Open Error (E-21)
Perform the operation again and check if it
is working properly.
: Check if the sensor housing
is inserted into the connector
of the main PCB.
The sensor is out of order.
Is the sensor disconnected?
Is the sensor wire
connected properly?
Does the voltage change
as the humidity, temperature
and weight change?
Replace the sensor.
: Check if the sensor wire is damaged, if the
housing is loose and if the sensor and the
wire are properly connected.
: Check if the voltage of the GND and sensor
changes using a digital multi-meter
by forcefully changing the humidity, temperature
and weight.
Connect the sensor.
Connect the
wire properly.
S/W Error
After Power -> On, does
the symptom continue?
Replace the PCB.
connector
connector
BF641FST_XFA_05291A.indb 21
2011-10-31 �� 1:33:35
