Question about Bemis 4D7-800 Humidifier

1 Answer

Motor replacement My motor stops running and gets hot. I oil it and turn the blade and it will run for a few hours and stops again. I assume I need to replace the motor. Any idea on the part number for the motor replacement?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 625 Answers
Re: Motor replacement

Probably a fractional horsepower open frame motor - go to grainger dot com and see if you can find a replacement

Posted on Jan 20, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Fan works for short periods

Sounds like the fan is overheating- these are typically 1/20th HP motor- VERY weak! Try cleaning/ blowing the motor out to get rid of dust/ hairs/ grime/ etc. then oil the bearings with 3-in-1 oil like sewing machine oil, spin it a few times by hand to free it up & try using again.Short of that, get a new motor for it- if you can't find one, believe it or not most bathroom exhast fans are the same motor, and if you look at a few in Home Depot, you'll find one that will be almost a direct fit!

Mar 30, 2013 | Humidifiers

1 Answer

Only one fan working

There are two causes of your problems:
1. The fan needs you to manually turn it to start running.
Problem: The motor bearings both ends are dried out.
1. Remove the motor/fan from the motor housing (there are two screws that hold the motor to the housing. The only way I know how to get to the screw is to bend one of the fan blade up and use a long screw driver to get to the screws.
2. Remove the two screws that hold the bearings to the motor.
3. Detach the bottom bearing (opposite of the fan end.) You might have to use a flat screw driver to pry the bearing off.
4. Use a Q-tip and soak it with motor oil or grease then lubri- cate the fan end shaft/bearing.
5. Use a Q-tip + alcohol to clean up the bottom bearing hole, then lubricate it with grease or motor oil.
6. Put the motor and bearings back together and make sure that the fan can turn freely now.
7. Install the motor/fan back into it housing.
The fan should turn on its own without you helping it.
If the fan won't turn, you have a bigger problem. See below.

2. The fan won't turn at all and is really tight even when you try to
turn it by hand.
Problem: The transformer coil(s) is/are burnt out. Chances are you let the fan run dry to a point that it squealed and started to smell like it was burning before it quit all together.
Solution 1:
1. Remove the filters and their housing on the bad fan side.
2. Duct tape a piece of plastic over the bad fan opening.
3. Run the humidifier with one fan. It works just as well.

Solution 2:
1. Buy a new humidifier.
2. Make sure you lubricate the bearings as soon as the motor begins to squeal.

Solution 3: You need knowledge of electricity
1. Take the motor/fan out from the housing.
2. Use a vote meter to check the resistance in both coil of the transformer; should read about 17 ohms. The coil(s) that has a high reading or if the meter shows 'OL' is bad. Remove the Yellow tape from the coil to see if you have a loose soldering joint between the coil wiring the electrical cord. If yes, solder the joint back together, check the resistance again to make sure you have about 17 ohms. If the answer is yes, put the yellow tape back on the coil and use electrical tape to secure the tape. Hopefully, the fan should work now. Good luck!

Feb 03, 2013 | Kenmore 14417 Humidifier

2 Answers

Kenmore Humidifier 14114 - the fan suddenly stopped running. Changed fliter and water, unplugged the unit, changed dial to highest humidity level - the unit will not run.


Please turn off the power to the unit and unplug it. Now check the fuse inside the unit, make sure its fine and not burnt If fuse seems OK then inspect the connections to the fan and make sure the wires are not cut. Also, inspect the control for any burnt components, use a multimeter to confirm. Hope this helps... Please post back with complete model# if you need more information.


Jan 04, 2011 | Kenmore Humidifiers

1 Answer

When I turn on the unit, it humms and the fan doesn't turn. Help.

If you can easily get to motor I would unplug unit and check motor to see if it turns freely. If it does I would plug the unit back in and see if the humming noise is coming from motor. Ifyou decide that the motor is the source of the noise and you can do so safely spin the fan and see if it will try to run, If it does I would unplug unit and give fan motor and blades a thorough cleaning. Clean any hair,lint or dust from aaround motor shaft. A small motor like these does not take much to slow or stop them. Plug it back in and try it. If it stiil does not work I would replace the motor. Hope this helps. Thanks

Nov 19, 2010 | Bemis 697 400 Humidifier

1 Answer

Am repairing this a/c split unit .whirlpool As-12cr3fd initially the evaporator motor was not starting up, the cap was changed and only when the rpm sensor jack was unplug the motor would spin. the...

sounds like 1 of a few issues here. Either the run capacitor is incorrectly sized with a capacitor that is too large. The motor may also be receiving the incorrect voltage. Or the motor may not have been oiled as needed and now the bearings are heating up and overheating...and possibly swelling up and slowing the motor down, which will affect any sensor hooked into is as this will cause a dramatic increase in amp draw to get the motor to run as designed.

Best bet at this point is to replace the motor and capacitor. Make sure the fan blades are clean and free of obstruction.

May 19, 2010 | Humidifiers

2 Answers

My aprilair's humidifier motor began to make loud squealing noise

Put some lubricant, oil, WD40, etc. on shaft of fan. Spin the fan with your finger and work the oil into the shaft until the fan spins freely again. Reassemble and problem will be gone for 2-3 weeks. Repeat again until you want to replace the fan motor.

Dec 31, 2009 | Aprilaire 700 Humidifier

1 Answer

General Aire 1137 Humidifier fan won't engage.

the lubracation used in the fan motor has an expected life of 5 years... once the lub is gone from the oillite bearings then the fan will stop .. you can put a couple of drops of oil on the motor bearings if you can get to them .. spin it by hand a few times to distribute the oil ... dont use WD40 or Teflon filled Oil .. use a light non gumming machine oil .. since you cant get that oil to permiate the porous bearings (done in a vacuum) then you will have to relube every year or so to keep it going .. you could replace the motor but that might not save much over a new unit .

Dec 23, 2009 | Humidifiers

1 Answer

Squeeky humidifier when turn on . Squeaks at random times. Sometimes we have to completely turn it off because it is so bothersome.

Hard water particles will build up in the fan bearings and cause the squeaking. Unplug the thing, and locate the fan motor(s). Place a few drops of 3-in-1 oil on the bearings where end of the shaft is mounted on the motor. This will lubricate motor, making not only run quieter, but faster, cooler, and more efficient.

Nov 02, 2009 | Humidifiers

1 Answer


Sounds like your motor bearings are going bad. If at all possible lubricate the motor bearings using a few drops of a NON detergent oil. If the motor has sealed bearings with no oil ports then you should replace the blower motor.
Good luck

Mar 29, 2009 | Essick Air 447 302 Console Whole House...

1 Answer

Furnace blower blows cold air

It is possible that you did not set the new blower on the proper speed. Black wire is high. Blue is medium. Red is low. If the fan is operating to slow it can run to hot and trip the high limit control. Make sure the filters are clean. When the old motor went bad, the problem might not have been discovered rite away your high limit control might need to be changed.
Also anytime you work on a furnace you can kick up some dust. Always clean the flame sensor.
Good Luck
HVAC Teacher

Mar 08, 2009 | Honeywell Power Humidifier: Furnace...

Not finding what you are looking for?
Bemis 4D7-800 Humidifier Logo

Related Topics:

297 people viewed this question

Ask a Question

Usually answered in minutes!

Top Bemis Humidifiers Experts


Level 3 Expert

1033 Answers


Level 3 Expert

1751 Answers

Barrett Palumbo
Barrett Palumbo

Level 2 Expert

1772 Answers

Are you a Bemis Humidifier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides