Why is it fog machines always have issues. 1 fog machine works great the other 2 worked as I was testing then gave up. They are all 1k watts 1 pisses the fluid out won't warm up the machine is cold the other gets hot but no fluid comes out. It appears I need a pump for one and heating element for the other. Is there a place to get replacement parts? Should I even bother or just junk them for 2 new ones?