FAN MOTOR 0 STOP AND SHUTDOWN is a common CNC machine alarm/message indicating that Fan Motor No.1 has stopped and the control has initiated a shutdown. The exact meaning depends on the machine manufacturer, but it is usually related to cooling fan monitoring.

Possible causes

1. Fan Motor #1 failure

Cooling fan is not rotating
Fan bearing seized
Fan blades blocked by dust/chips
Fan motor burned out

2. Fan feedback/alarm signal missing

Fan has a built-in alarm output (FG/tachometer)
Fan rotates but the control does not receive the rotation signal
Broken fan cable or loose connector

3. Power supply problem

Fan supply voltage missing (commonly 12VDC, 24VDC, or 200/220VAC depending on fan)
Blown fuse
Faulty fan power board

4. Overheating protection

Fan stopped → amplifier/spindle/control cabinet temperature rises
CNC shuts down to protect servo/spindle drives

Troubleshooting steps

1. Power OFF the machine completely

Wait 5–10 minutes.
Open the electrical cabinet safely.

2. Check Fan Motor #1

Is it physically spinning?
Is there abnormal noise?
Is it blocked by dust?

3. Check the fan connector

Remove and reseat the connector.
Check for loose pins or damaged wires.

4. Measure fan voltage

With power ON (only if safe):
Check whether the correct voltage reaches the fan.
If voltage exists but fan does not run → replace fan.
If no voltage → check fuse, relay, power supply, or control board.

5. Check alarm reset

After replacing/repairing the fan:
Turn power OFF.
Wait.
Turn ON again.
Clear alarm.