Remedy
10
Remedy
Fault
Valve does not perform
the specified turning
movement, or does not
open or close
Actuator position does
not match valve position
50
Possible cause
Incorrect control pressure
level selected
Control air function and
connections do not match
Control air failure
Control air supply line or
outlet line blocked
Valve seized
Valve pin/stem broken or
twisted
Instruction manual
Remedy
Check the control pressure
Check the FC, FO, DA
functions and related
connections
Switch on the control air
again
Check that the control air is
connected correctly, see
Section 7.2
Replace the valve
Have the valve serviced or
repaired, see the user
instructions of the valve
manufacturer
Replace the valve