1
Sensor out of range
Rotary screw
CheckCheck pressure/temp sensor readings on the diagnostic screen vs known good gauge.
FixReplace transducer / RTD; verify wiring shield grounded one end only.
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2
Active alarm not yet acknowledged
CheckSome controllers require ACK + RESET.
FixPress ACK then RESET per OEM.
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3
Battery-backed memory corrupted
Rotary screw
CheckRandom faults after power loss.
FixReplace controller battery; reload parameter file.
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4
Loose I/O wiring
CheckWiggle test on terminal strip during alarm.
FixRe-terminate, torque to spec.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.