1302

Check Physical Coolant Level

Visually inspect the chiller reservoir tank and verify coolant level against the minimum fill line marked on the tank.

Ensure spindle is stopped and cooled before opening chiller access panels.

Add Coolant if Low

Add appropriate coolant mixture (typically 50/50 glycol/water) to bring level to maximum fill line. Use only Haas-approved coolant types.

Always use distilled water when mixing coolant to prevent mineral buildup in the system.

Reset Alarm and Test

Press RESET to clear alarm 1302, then test spindle operation at low RPM to verify proper chiller function and alarm clearance.

Check for Leaks

Inspect all chiller hoses, fittings, and connections for coolant leaks that may have caused the low level condition.

Locate Level Sensor

Access the chiller reservoir and locate the float switch level sensor, typically mounted on the side of the tank.

Disconnect electrical power to chiller before accessing sensor connections.

Test Sensor Operation

Manually lift the float switch and verify it moves freely. Check for debris or coolant residue preventing proper float movement.

Clean float mechanism with isopropyl alcohol to remove any sticky residue.

Check Electrical Continuity

Using multimeter, test sensor switch continuity with float in up and down positions. Should show open circuit when float is down (low level).

Replace Sensor if Faulty

If sensor fails continuity test or mechanical operation, replace with Haas OEM level sensor and reconnect wiring harness.

Inspect External Connections

Check all visible coolant hoses, quick-disconnect fittings, and connections between chiller and spindle for signs of leakage.

Look for white residue or staining around fittings which indicates dried coolant from small leaks.

Check Chiller Pump Area

Inspect around the chiller pump housing and motor for coolant leaks from pump seals or gaskets.

Examine Heat Exchanger

Check heat exchanger coils and connections for leaks. Look for coolant dripping or pooling beneath the chiller unit.

Pressure Test System

If leak source is not obvious, perform pressure test on chiller system to isolate leak location before repair.

Check Sensor Wiring Connections

Inspect wiring connections at the level sensor for corrosion, looseness, or damage. Clean and tighten connections as needed.

Power down chiller system before working on electrical connections.

Trace Wiring to Control

Follow sensor wiring harness from chiller to NGC control cabinet, checking for pinched, cut, or damaged wires along the route.

Test Signal at Control

At the NGC control input terminals, verify proper voltage signal from level sensor using multimeter while manually operating float switch.

Repair or Replace Wiring

Repair any damaged wiring or replace entire harness if multiple wire damage is found. Ensure proper routing and strain relief.

Check Pump Operation

Verify chiller pump is running when spindle operates. Listen for pump motor noise and check for coolant flow through sight glass if equipped.

Pump should start automatically when spindle is commanded on and chiller temperature rises.

Test Pump Motor

Check pump motor electrical connections and test motor operation. Verify proper voltage supply to pump motor terminals.

Inspect for Pump Blockage

Check pump inlet strainer and coolant lines for blockages that may prevent proper circulation and cause pump cavitation.

Replace Pump if Necessary

If pump motor or impeller is failed, replace with Haas OEM pump assembly and refill system with fresh coolant mixture.