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Check Pump Motor Power

Navigate to CURRENT COMMANDS and verify M08 coolant on command is active. Check electrical panel for blown fuses on coolant pump circuit.

Lock out main power before checking electrical connections

Test Pump Operation

Manually activate coolant using M08 command in MDI mode. Listen for pump motor operation and observe coolant flow from spindle nozzles.

Pump should start within 2-3 seconds of M08 command

Inspect Pump Motor Connections

Check pump motor wiring harness connections at motor and in electrical cabinet. Look for loose connections, corrosion, or damaged wires.

Coolant contamination can cause electrical connection corrosion

Replace Pump Motor

If motor tests show no operation with proper voltage, replace coolant pump motor assembly per Haas service manual procedures.

Check Coolant Tank Level

Visually inspect coolant tank level. Tank should be filled to minimum level mark or above low-level sensor probe.

Tank level should be visible through sight gauge on tank side

Refill Coolant Tank

Add appropriate coolant mixture to tank, filling to proper level mark. Use manufacturer-recommended coolant concentration ratio.

Never use straight water - always maintain proper coolant mixture ratio

Test Level Sensor

After refilling, clear alarm using RESET button and test coolant operation with M08 command to verify level sensor is functioning properly.

Check for Leaks

Inspect coolant lines, tank, and machine base for leaks that may have caused low level condition. Repair any found leaks before operation.

Check Coolant Flow

Activate M08 and observe coolant flow from all nozzles. Weak or no flow indicates blockage in filter or lines.

Normal flow should be steady stream, not dripping or weak spray

Inspect Coolant Filter

Remove and inspect coolant tank filter element. Clean or replace filter if clogged with chips or debris.

Turn off coolant pump before removing filter to prevent contamination

Clear Supply Lines

Disconnect coolant lines at pump outlet and blow out with compressed air to remove any blockages. Check nozzles for chip buildup.

Use low pressure air (30 PSI max) to avoid damaging seals

Test System Pressure

Reconnect lines and test coolant flow. If flow remains poor, check for kinked or damaged coolant hoses throughout system.

Verify Actual Coolant Flow

Check if coolant is actually flowing properly from nozzles when M08 is commanded, despite alarm condition.

If flow is good but alarm persists, suspect pressure switch failure

Locate Pressure Switch

Find coolant pressure switch in electrical cabinet or on coolant manifold. Check wiring connections for tightness and corrosion.

Pressure switch contacts can be damaged by coolant contamination

Test Switch Continuity

Using multimeter, test pressure switch continuity with coolant pump running. Switch should close contacts when proper pressure is achieved.

Normal operating pressure switch closes at 15-20 PSI

Replace Pressure Switch

If switch tests show no continuity change with pressure, replace pressure switch with Haas OEM part number per service manual.

Check System Diagnostics

Navigate to SETTINGS > PARAMETERS and check coolant-related parameter status. Look for input signal anomalies in diagnostic screens.

Parameter 37 controls coolant pump delay timing

Verify Input Signals

Access DIAGNOSTICS > INPUTS screen and monitor coolant pressure and pump feedback signals while operating system manually.

Document all parameter values before making changes

Test Input Module

Check input module LED indicators for coolant circuit inputs. LEDs should change state when coolant system operates properly.

Consistent LED states regardless of actual coolant operation indicate module failure

Contact Haas Service

If input module failure is confirmed, contact Haas technical support for NGC control module replacement and calibration procedures.