typically by fogers reach me they suffer from one or both of these problems:
1) the internal tube in the heater is completely clogged at a
bend. i have tried everything to
shift this type of blockage from vinegar to CLR. I would only recommend the vinegar at home. If vinegar does not
clear the blockage then it is type for a new heater. Be prepared for a
shock on the pricing - these items can easily exceed $100.
2) the pump is normally an electromagnetically operated piston pump that operates using 120Vac that in fogger applications is only opearting on one half of the
sine wave. The pump has become internally stuck due to dirt or biofilm. If your fogger has a tank that you refill and it has strands of thick white stuff in it this is biofilm - a large colony of bacteria, which can clog the pump. Alternatively a part in the pump may be worn and either not sealing or allowing fluid to flow past it instead of being pushed. Either of these conditions will appear that the pump is trying to work. Some pumps allow you to disassemble them for cleaning but if the problem is wear then it needs to be replaced. Again be preaperd fro sticker
shock pumps start at 430 plus shipping and can go over $100.
Cheap foggers you can just replace. Expensive foggers are worth repairing but if you keep them clean, remove the fuid when they are not being used for more than a week or two and run vinegar through them regularly you will get years of good service. I recently repaired one
unit from a nightclub that had more than ten years of service before needing a pump.
Good luck with it