"If you get this alarm, and you don't do anything else, like hit reset, and just turn the key off, that alarm goes away and no others are present, its probably an e-stop.
I am sure if you look at the H/V light under the Laser key switch its out. If you look at diagnostic 908 (i think) "laser sequence" = 20. That would mean you laser is in "stand-by". And more than likely a E-stop has caused it."
Laserninja, SPOT ON!
That is the exact scenario.
When it does this, we have to power down the machine and power it up again. The time loss is hugely frustrating.
Thanks for your advice. I'll try to trace the wiring for the limit switches in the morning.
This has been a problem for about a year now. It used to happen once a month, then once a week. Now it's every ten minutes, rendering the machine unusable.