7-51 
Cause Confirmation 
Solution 
technical alarms are 
technical alarm is 
Refer to 4.3 to clear the 
alarm. 
The problem persists. 
The problem 
persists. 
(refer to 11.5.2). 
(2) If the problem persists, 
replace the sensor adapter 
board (refer to 11.1.16). 
3. If the problem persists, 
replace the drive gas 
assembly (refer to   
 
 
7.4.8 BFCS Failures 
Cause Confirmation  Confirmation Result  Solution 
No response 
when the BFCS 
door is opened 
or closed in the 
EFCS state 
1. Open the BFCS door and 
check whether the two 
magnets near the rotating 
shaft inside the BFCS door 
The magnets of the 
BFCS door fall off. 
Replace the BFCS door 
(refer to 11.1.5). 
BFCS door assembly 
Proceed with step 2. 
2. Select Setup > Service > 
Data Monitors > FCS to 
access the flowmeter data 
monitoring screen. Open 
and close the BFCS door in 
turn, and observe the status 
of BFCS Door Switch 1 and 
BFCS Door Switch 2. 
is closed, BFCS Door 
Switch 1 or BFCS 
Door Switch 2 is On; 
or 
when the BFCS door 
is open, BFCS Door 
Switch 1 or BFCS 
(1) Reconnect the cable of 
the BFCS switch control 
board (refer to 11.1.5). 
(2) Replace the BFCS 
switch control board PCBA 
(refer to 11.1.5). 
BFCS door 
failed to open 
automatically 
upon 
switchover to 
BFCS 
1. Check the joint of the 
BFCS door for dirt and 
debris. 
There is dirt or debris 
in the joint of the 
BFCS door. 
instrument panel. 
If the problem persists, 
debris in the joint of 
Proceed with step 2. 
2. Manually open the BFCS 
door to check if it is stuck. 
stuck (possibly due to 
deformation caused 
by aging or improper 
Replace the BFCS door 
(refer to 11.1.5). 
If the problem persists, 
proceed with step 3. 
The BFCS door is not 
stuck. 
Proceed with step 3. 
3 Open the BFCS door and 
check whether the two 
electromagnets outside the 
BFCS door fall off. 
of the BFCS door fall 
Replace the BFCS door 
(refer to 11.1.5). 
The electromagnets 
of the BFCS door do 
Proceed with step 4.