Okuma Alarm A-8645 – Fire Extinguishing Unit Error
Alarm A-8645 indicates that the fire extinguishing unit has reported a fault condition.
This alarm is triggered when the fire protection system detects an internal error or an abnormal operating state. The CNC receives a fault signal from the extinguishing unit and may restrict machine operation for safety reasons.
Typical causes include:
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Empty extinguishing agent cartridge
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Low pressure in the suppression system
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Faulty pressure sensor
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Internal control error in the fire unit
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Power supply instability
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Wiring or signal failure between the fire unit and CNC
Unlike A-8646 (power OFF), this alarm usually means the unit is powered but reporting a malfunction.
Recommended checks:
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Inspect the status indicator on the fire extinguishing unit.
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Verify extinguishing agent level and system pressure.
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Check power supply and fuses.
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Inspect signal wiring to the CNC.
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Reset the fire suppression unit if applicable.
Because this is a safety-related system, the machine may not allow automatic operation until the issue is resolved.
