How to Repair Fog Machines

Written by alex smith
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How to Repair Fog Machines
Fog machines can be used to create a realistic mist. (girl on bike in mist image by Maxim Petrichuk from

Theatrical fog machines, which are very popular around Halloween, use a mixture of water and glycol. When the mixture is heated it turns into a dense, foglike haze that can be pumped into the air. Like all electronics, a fog machine will eventually need repair. Before taking it to a repair shop, you can check for a number of simple problems yourself.

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Things you need

  • Water
  • Soap
  • Toothbrush

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  1. 1

    Check that the fog machine is plugged in, turned on and filled with fog juice. It seems basic, but these can often be the cause of your problems.

  2. 2

    Check the fuse if the machine comes with one. If the fuse has died, the entire machine will not work. Unplug the machine and replace the fuse if needed.

  3. 3

    Turn off the fog machine and allow it to heat up. A fog machine won't work unless it's already hot. Some fog machines need as much as 10 or 15 minutes, so if you plug it in and try to use it right away it will appear to be broken. In general, the higher the wattage, the faster it will heat up.

  4. 4

    Clean the fog machine. Many problems with limited fog production are the result of residue build-up. Begin by running water through the machine instead of fog juice (careful, the steam will be hot). If that doesn't help, unplug the machine and unscrew the nozzle that the fog comes out of. Give it a good scrubbing with a toothbrush and soapy water, then reassemble the machine.

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