We had this issue the other week, @RichardC a little while after turning on the laser cutter, and Oliver also had the same problem - the space is quite cold when you first arrive. On the advice of @9600, who has a similar machine, there are 2 options BEFORE STARTING TO LASER CUT:-
- either just leave it beeping & eventually it should stop, when it warms up enough;
- or after a few mins of beeping, turn it off & on again (yes, really!), and then wait for the temperature to settle to see if it dips too low again or not.
When it happened to me, I tried the 2nd method. The 2nd time it was switched on, the temperature started falling, but eventually settled without further alarms. ONLY THEN DID I START LASER-CUTTING.