Technical Alarms Check Repair and Troubleshooting
5 - 14 046-006272-00 A7™ Service Manual
5.2.4.2 BFCS Failure Alarm Numbering Conventions
0x01000000
Balance Gas N2O
Branch Flow Not
Achieved exceeds
0.4LPM
1. Select [Setup]?[Service]?[Review Logs]?[Alarms]. Observe if there is "FPGA
FAIL" item available (ID:1000 0000) triggering "Electronic Flow Control Error"
alarm.
2. If this item is available, it indicates that there is problem with the
communication between FPGA and CPU. Or FPGA stops running, restart the
machine. If the problem still persists after restarting the machine, replace 0632
EFCS VCM board PCBA.
3. If there is no "FPGA FAIL" item available, the part of flow sensor in N2O limb
may have problem. In this case, turn off the machine and check flow sensor
cable connection. If cable connection is in good condition and the problem
still persists after restarting the machine, it can be considered that the flow
sensor is fault. Replace the flow sensor.
4. Return the faulty board or flow sensor to R&D.
0x02000000
O2 temperature
limit
1. Make sure that the temperature of O2 supply gas does not exceed 50?. If
excess temperature does not occur to the gas supply, it is probably Sensirion
flow sensor failure in O2 limb.
2. Turn off the machine. Restart the machine after making sure that cable
connection is normal. If the problem still persists, consider replacing the O2
flow sensor.
0x0400000
Balance gas AIR
temperature limit
1. Make sure that the temperature of AIR supply gas does not exceed 50? (the
possibility is very small). If excess temperature does not occur to the gas supply,
it is probably Sensirion flow sensor failure in AIR limb.
2. Turn off the machine. Restart the machine after making sure that cable
connection is normal. If the problem still persists, consider replacing the AIR
flow sensor.
0x0800000
Balance gas N2O
temperature limit
1. Make sure that the temperature of N2O supply gas does not exceed 50? (the
possibility is very small). If excess temperature does not occur to the gas supply,
it is probably Sensirion flow sensor failure in N2O limb.
2. Turn off the machine. Restart the machine after making sure that cable
connection is normal. If the problem still persists, consider replacing the N2O
flow sensor.
0x1000000 FPGA FAIL
Restart the machine. If the problem still persists, it belongs to hardware failure.
It may be board failure. Replace with a new EFCS board.
0x2000000
Flow sensor single
selftest error
1. Alarm mechanism: open a certain flow. Compare the measured values of O2
and N2O flow sensors in the respective limb with those of O2 flow sensor in the
total limb. This alarm is triggered only when the measured values of flow
sensor in the limb is not consistent with those of O2 flow sensor in the total
limb. It is not a problem with proportional valve or EFCS board.
2. Restart the machine. Conduct flow sensor single selftest again. If the
problem still persists, check if the cable connection between the flow sensor in
each limb and that in the total limb, and tube connection between the flow
sensor in the total limb and the EFCS module are normal.
3. If the problem still persists with normal cable connection and tube
connection, replace the flow sensor in O2 or N2O limb according to the
prompt message of selftest result and return the faulty flow sensor to R&D.
ID No Cause Solution
ID No Cause Solution
0x00000001
LED Power Voltage Too
Low
1. Restart the machine. If the problem still persists, it belongs to hardware
failure. It may be cable failure or 0632 EFCS VCM board PCBA failure.
2. If the problem still persists after re-plugging the cable, replace with a new
board and return the faulty board to R&D.
0x00000002
LED Power Voltage Too
High
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