5 Common Cooling System Issues Causing Fiber Laser Overheating

Continuous overheating is a frequent breakdown of fiber laser cutters and welders, mostly triggered by abnormal operation of the supporting cooling chiller. Below are the five most common cooling system issues to inspect first when thermal alarms pop up:

1. Insufficient or Degraded Cooling Water
Long-term use causes coolant loss, water scaling or coolant deterioration. Reduced liquid volume lowers heat exchange efficiency, while scale blocks internal laser heat exchangers.
Solutions: Refill deionized cooling water to the standard liquid level; drain old coolant and clean scale inside pipelines, then replace with new dedicated laser coolant.
2. Blocked Water Filters & Clogged Heat Exchangers
Dust, metal powder and impurities accumulate in water filters, condenser radiators and heat exchange cores. Air-cooled chillers with dusty condensers cannot dissipate heat outward normally.
Solutions: Remove and clean water filter cartridges; blow dust off the condenser fan and radiator with compressed air regularly.
3. Malfunction of Cooling Water Circulation Pump
A worn, aging water pump leads to weak water flow or intermittent circulation. Without stable coolant flow, laser internal heat cannot be transferred out in time.
Solutions: Check pump running noise and water flow meter readings; repair or replace the circulation pump if flow pressure is below the factory standard.
4. Failed Cooling Fan & Abnormal Temperature Sensors
Condenser cooling fans stuck or damaged reduce heat dissipation capacity. Damaged temperature probes transmit inaccurate temperature data, triggering false overheating alarms or delayed temperature protection.
Solutions: Test fan rotation and power supply; calibrate or replace faulty temperature sensors matching the chiller model.
5. Improper Chiller Parameter Setting & Poor Ventilation Environment
If the set cooling water temperature is too high, the chiller cannot reach the target cooling effect. Besides, placing the laser chiller in a closed, unventilated workshop causes hot air recirculation.
Solutions: Reset the chiller temperature to the manufacturer's recommended range; reserve sufficient space around the chiller for air convection, avoid direct sunlight and enclosed corners.

Regular weekly maintenance of the cooling system can effectively avoid fiber laser overheating faults and extend the service life of laser generators.