A chiller flow switch trip can stop a cooling system and disrupt industrial production. This condition typically occurs when the water flow through the evaporator or condenser falls below the minimum level required by the manufacturer.
For Purchasing Teams, Utility Managers, and Industrial Maintenance Teams, understanding the causes of low water flow helps speed up troubleshooting and reduce unplanned downtime.
What Causes a Chiller Flow Switch Trip?
1. Circulation Pump Problems
A malfunctioning pump, incorrect motor rotation, or damaged impeller can reduce water flow through the system.
2. Clogged Strainer or Filter
Dirt, scale, and debris in the water circuit can restrict flow to the chiller.
3. Closed or Partially Open Valves
Incorrect valve positions can limit water circulation and cause the flow switch to trigger an alarm.
4. Air Trapped in the Piping
Air pockets in the water circuit can disrupt circulation and cause unstable flow switch signals.
5. Faulty Flow Switch or Electrical Connection
If the actual water flow is normal, inspect the flow switch, installation position, wiring, and control panel signal.
How to Troubleshoot a Chiller Flow Switch Trip
Follow these inspection steps:
- Verify that the circulation pump is operating correctly.
- Check water pressure and flow rate against the manufacturer’s specifications.
- Inspect strainers, filters, and valve positions.
- Check for trapped air and water leaks in the system.
- If water flow is sufficient, have a qualified technician inspect the flow switch and electrical connections.
Important: Do not replace the flow switch before confirming that water flow is adequate. Never bypass or jumper the flow switch, as it protects the chiller from operating under insufficient water flow.
Prevent Downtime with Regular Chiller Maintenance
Routine inspection of pumps, filters, valves, piping, and flow switches helps maintain chiller performance and reduce unexpected production interruptions.
Air Hira Indonesia supports industrial equipment maintenance, including chiller and HVAC systems, to help businesses maintain reliable operations.
Air Hira Indonesia — Your Partner In Industrial Machinery
Website: www.airhira.com
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