Question about Bemis 4D7-800 Humidifier

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The power light on my Bemis 4D-7800 humidifier flashes.

It will not run, even though the tanks are full and the filter is in place. The power light flashes. I tried to turn it on/off, but the controls for the humidity and speed are non-responsive. The manual doesn't give any helpful information. I just took it out of the attic to use for the first time this season. It was clean and dry.

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  • bidme2come Jan 20, 2009

    My problem is similiar. I just inherited this console humidifier, filled the tanks and plugged it in. The lights come on, adjusted speeds etc....but nothing else. the fan's not turning (not even sure it's suppose to initially cause I don't have a manual) any help will be greatly appreciated.



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On my water wheel several parameters must be met. 1. Power on, cord plugged in. 2. Water in tank, the float arm needs to move to indicate water present, the red light on the dash indicates no water. 3. Humidity controll set higher than the room atmosphere humidity, clockwise is higher on mine. 4. The fan speed selecter must be on either high or low, the fan won't run unless one position is selected. I hope this helps

Posted on Jan 31, 2009


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Posted on Jan 02, 2017


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3 year old Essick tower D46720 sat during off season. Cleaned, filled and plugged in today and will not turn on. Lights are on; nothing happens.

The red water level light was on even though both tanks were full. The white float behind the filter WAS stuck to the bottom of the tank. I just moved it to its floating position and voila! it is working.

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You should be able to get a higher humidity rate at normal settings. If you want high humidity above 40% that should be easily done with the high speed operation. The unit may need a good internal cleaning, and use a Vinegar solution to clear any Calcium or other mineral deposits from the misting ports and misting elements. You must use only Distilled or Filtered water, not tap water.

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Fan and tank lights won't run

I would look at the floating switch actuator. It's common for the float to bind up in the holder which keeps it in place. If the actuator is floating free, then look at the switch itself. Could be corroded or otherwise malfunctioning.

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These hints are from the air o swiss webpage.
Q: No mist / unit is not working / empty indicator keeps flashing
A: Fill up the water tank. Check if water is flowing through the demineralization cartridge (attached to the water tank cap). If the water tank is full but there is only little water in the base it indicates that the water is now flowing through the demineralization cartridge.

  • Wait for 15 minutes to allow the mist to come out of the unit.
  • If the unit is not working and the empty light is not flashing you might have set the desired humidity too low and the current humidity level in the room is higher. That is why the unit switches off automatically.
  • If the empty indicator continues flashing and the tank is full, water is not flowing through the cartridge. Exchange the cartridge or the granules in the cartridge after 2-3 months, in areas with hard water exchange the cartridge after 1 -2 months. However, the demineralization cartridge and or the granules must be exchanged at the latest after 6 months or the unit does not reach its full performance.
If the granules are new, see the following instructions:

  • Make sure the cartridge and/or granules were soaked for 24 hours, water takes longer to filter through dry granules in cartridge and into the base. Next, remove 2 tablespoons of granules from the cartridge, and throw them away. Too many granules in the cartridge it does not allow water to flow from the tank to the base.
If your issue is with the float and not the mister, then you have to make sure the float is tripping the micro switch that turns the machine on. Some units the filter will not allow the float to hit the switch if the filter is not installed correctly. If everything is in correctly and the float is tripping the switch, then the micro switch must be faulty.

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1 Answer

The light is on but the motor doesn't start up even with the moisture set high

Please check the switch for the water bucket that senses wether the container is in place or not. That will stop the unit from running.

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1 Answer

My Holmes HM3500 Humidifier is plugged in and full of water. Just replaced filter. Filter has soaked water all the way up to the top of filter. Both lights are lit, but fan is not turning on. I have tried...

Hi there,

The tank may be full. Your dehumidifier has a safety device that turns off the dehumidifier when the water tank is full. Usually the tank itself either presses against a switch or there's a device connected to the tank that triggers a switch when the tank is in place and full.
If you've emptied the tank and the unit doesn't run, inspect the place where the tank rests to see if there's a switch or mechanism that's not being activated. You may be able to turn it on with a simple flick of your finger.

Post comments  for more help or information .........

Good Luck!!


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Moisture not coming out

i realize this answer is a year old; but, i would guess you didn't let the wick become saturated before running. fill the resevoir with water, then let the humidifier sit idle while the wick is saturating. when it is completely saturated, the refill light will go off. refill the resevoir with additional water, as needed. then you can run the humidifier.

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sounds like new caps should solve it, but have you tried soaking the old caps in vinegar overnight? these guys are not the only ones, but they have the correct caps in stock at a pretty good price hope this helps :)

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