Background
The coolant systems are controlled with the following G-code (M-code) commands:
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M08
(flood) -
M09
(deactivate all coolant)
When PathPilot identifies those commands it causes a component on the control board to power, or remove power, to the coolant pump.
Tools
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Digital multimeter
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Screw Driver
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Box Wrench or Crescent Wrench
Reseat the coolant pump power cord
Reason: The coolant pump isn't plugged in to an outlet.
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Unplug and reseat the coolant pump power cord.
Inspect the coolant pump strapping
Reason: The coolant pump isn't strapped for your machine power.
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Open the box on the side of your pump. Check the strapping compared to the diagram on your pump.


Inspect fuse FU11 on the machine control board
Reason: Fuse F11 on the machine control board is blown.
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Power off the machine.
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Locate and remove the F11 fuse from the machine control board.

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Measure the resistance across the fuse with digital multimeter set to resistance.
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Replace the fuse if the digital multimeter reads OL, shows a resistance in the MΩ, and/or doesn’t produce continuity tone.
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If the fuse measure 0-5 Ω, reinstall it into the machine control board.
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If the coolant pump shorts, the 8 A, FU11 flood coolant fuse on the control board blows before the FU1, FU2, or FU6. https://tormach.com/fuse-5x20-glass-8a-217-series-31655.html