A7™ Service Manual 046-006272-00 3 - 19
Periodic Maintenance Functional Tests
The BFCS fails to retract
during automatic backup
flow control test.
The stepper motor of BFCS is faulty.
1. Re-start the machine.
2. Replace the parts of backup
flow control system.
The three-way valve is
faulty.
When the three-way valve is switched to
BFCS limb during BFCS automatic test, the
measured flow of total flow meter is less
than 0.2L/min.
1. Check if the gas supply
connection and supply gas
pressure are normal.
2. Replace the three-way valve.
Failure description Possible cause Recommended action
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