Yes, they can be repaired but it requires electrical knowledge to track down exactly what the problem is. You need to determine if the heating element, the fluid pump, the power switch and the power adapter are working or not. If they all work, then you need to look into things like fluid line blockage or nozzle clogging.I bought a 1000w chauvet fog machine and it lasted one season. Now it does not heat up. Can these be repaired??