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Check coolant tank level and refill if below minimum. Verify pump is running when M-code commands coolant on.

Inspect and clean or replace the coolant filters. Clogged filters are a common cause of pressure loss.

Check all coolant lines, fittings, rotary union, and through-tool connections for leaks or damage. Tighten or replace as needed.

Use proper PPE when working with high-pressure coolant systems

Verify coolant pump operation and pressure output with a gauge. Compare against machine specifications (typically 20-70 bar depending on system).

Locate the coolant pressure switch (typically mounted near pump or spindle head) and verify wiring connections are secure and not corroded.

Use a multimeter to check pressure switch continuity. Switch should change state at specified pressure threshold.

Disconnect power before checking electrical connections

Check pressure switch signal at the control (ladder or PMC diagnostics). Compare actual pressure reading with switch state.

If switch is stuck or inconsistent, replace pressure switch and verify alarm clears. Confirm replacement part matches OEM specifications.

Access PMC diagnostics and monitor the pressure switch input signal (check machine electrical drawings for specific address).

Review spindle parameters related to coolant pressure monitoring, particularly timer settings for pressure confirmation delay.

Document all parameter values before making changes

Check if recent parameter changes, battery replacement, or software updates occurred. Restore from known good backup if available.

If mechanical and electrical systems check out, contact machine tool builder for ladder logic verification and possible timer adjustment.