Any fog machine has to reach a certain temperature before it will produce fog. Once the fog sprays out, it may need to warm up again, so it may pause, so a short pause can be normal. If, however, your machine completely shuts down, there may be a malfunction. Please contact Home Depot support if you think your machine or the Timer aren't operating as they should.
Yes. These timers are typically universal and can be used with numerous types of fog machines. It has been my experience that the fog machine switch port has not changed and is universal between models.
The timer replaces the manual switch which is not hardwired into the unit but rather a 3-prong plug. Most fog machine switch plugs are universal and can be used on any unit. I bought this timer for one of my older machines (bought 5 years ago) and it works.