How do I fix and clear Mazak alarm 258?

Check for chips or other foreign substances that obstruct cover open/close operation. If the alarm is not released, contact the nearest Mazak Technical Center or Technology Center. Clearing procedure: Fix cause → press RESET.

ALARMSMazatrol Assistant

WARNINGAlarm code

258

ATC COVER SENSOR(OPEN) MALF.

Q: What does Mazak alarm 258 mean?

Mazak alarm 258 is "ATC COVER SENSOR(OPEN) MALF.". The ATC cover open status sensor has not turned on within 10 seconds after the issue of an ATC cover open command. Error type: Machine (PLC) — machine failure. Machine state: Feed hold — feed stopped, machine ready.

What it means

The ATC cover open status sensor has not turned on within 10 seconds after the issue of an ATC cover open command.

What to do

1Check for chips or other foreign substances that obstruct cover open/close operation.
2If the alarm is not released, contact the nearest Mazak Technical Center or Technology Center.

Codebook — decoded

FError typeMachine (PLC) — machine failure

KStop statusFeed hold — feed stopped, machine ready

OClearingFix cause → press RESET

Still faulted after these steps? Do not restart under load — ask the Mazatrol assistant.

Still stuck? Ask the Mazatrol assistant →