Make sure the connectors for the P-COOL cable that connects through the connector bracket at the spindle head, and to P35 on the I/O PCB, are not contaminated and are properly seated. Check for damage to the cable. Run the program for 12 seconds. If the program is not working, reset the machine.

Run this program in MDI mode:

M34 G04 P1. ;

M35 G04 P1. ;

M99 ;

Find the connection for the P-COOL on the spindle-head connector bracket. While the program runs, use a multimeter with needle-tip probes to measure the voltage across pins 1 and 2, and pins 3 and 1. The voltage must measure 12 VDC. Do not measure the voltage with the cable disconnected.

If there is voltage, check for continuity in the cable between the P-COOL and the connector bracket. If there is no continuity, the cable is at fault. If there is continuity, the P-COOL assembly is at fault.

If there is no voltage, refer to:

• Next Generation Control - I/O PCB - Troubleshooting Guide
  
• Classic Haas Control - I/O PCB - Troubleshooting Guide
  

Make sure the ball valve for the coolant loop on the spindle head is fully open.

Remove any chips that are stuck in the P-COOL nozzle.

Clean or replace the filter element. Check the area around the coolant pump intake for chips.

1. Auxiliary Filter - The bag filters in the Auxiliary Filter tanks need to be cleaned or replaced. The Auxiliary Filter is an option. Your machine might not have this option.
2. Standard Filter - The Standard Filters need to be cleaned. Remove chips from the basket filter in the coolant tank.

Remove the coolant check-valve. Check it for blockage [1]. Make sure the trap door opens and closes freely. If the trap door does not close, coolant flows back into the tank. This delays the flow of coolant by a few seconds.

Disconnect both ends of the coolant hoses. Remove any kinks. In the opposite direction of the coolant flow, blow air through the hoses to remove any chips. If you find chips in the hoses, check the coolant nozzles and washdown hoses for chip buildup. Connect the coolant hoses.

Refer to the Standard Coolant - Tank - Maintenance procedure.