Troubleshooting for high coolant flow

Diagnostic codes 543, 544

The high coolant flow diagnostic codes (543 and 544) can occur because of a failed coolant pump. Do these steps to make sure that the coolant pump is operating correctly.

Symptoms


Code	Symptoms	XPR® models	XPR action	Code cancels with...
543	After the coolant pump stops, the coolant flow rate is more than 3.03 L/min (0.8 gal/min).	All models	Shut down	Set process Remote on-off
544	For a minimum of 1 second, the coolant flow rate is more than 11.36 L/min (3.0 gal/min). This code can also occur when air is in the line or when there is a torch blowout.	All models	Shut down	Remote on-off

Corrective action

Look at the Computer Numerical Control (CNC) or XPR web interface to make sure that the coolant pump is operational.
For diagnostic code 543, examine the coolant hoses.
1. Make sure that you have Hypertherm®-supplied coolant hoses.
2. Replace the bad hoses with Hypertherm-supplied coolant hoses, if necessary.
For diagnostic code 544, do the following steps to reset the cutting system:
1. Set the line-disconnect switch to the OFF position.
2. Examine the torch for consumables that are missing or that have severe damage, which can cause the flow meter to give a higher flow value.
  
  A missing water tube can also have an effect on coolant flow.
3. Set the line-disconnect switch to the ON position.
4. Use the CNC or XPR web interface to send a process command to the cutting system.
  
  The coolant pump starts automatically when it receives a process command.
5. If the code continues:
  - Examine the flow meter. Look for air bubbles in the sight glass. Air bubbles can cause the flow meter to give a higher flow value.
  - Make sure that the coolant level is slightly more than the level switch.
  - Examine the hoses and hose fittings. Look for damage or loose connections.
If you cannot find or correct the problem, speak to your cutting machine supplier or regional Hypertherm Technical Service team.