The spindle's reference (one per turn) signal from its encoder was not seen when it should have been.
What causes Haas alarm 173?
Spindle encoder cable loose or damaged. Failed spindle encoder. Belt slipping between spindle and encoder.
How do I fix Haas alarm 173?
Check the encoder cable connections. Look for coolant at the encoder. Encoder replacement and timing is a tech job.
Alarm numbers and text can differ by control model, software version and machine builder. This page is a starting point from people who have worked on these machines, not a replacement for your machine builder's manual.
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