Unplug the machine and take both the water jugs off. Take the motor unit off and flip it over. Plug it into an outlet and press down the small silver contact at the bottom of the motor. When you press this down, a connection is made and the motor should turn on (Don't worry about being electrocuted, this is perfectly safe). If the motor turns on and runs at various fan speeds, you know it's not an issue with the main unit.
When looking at the base, on the left side you'll notice a plastic piece sticking up that's held down with a plastic shroud and 2 screws. This is you water level sensor. When the water level raises up, this also rises and hits the silver contact on the bottom of the motor. Make sure this isn't binding up(I suggest you clean it) I had the same issue with my HMC-6012i, lights were on at the indicated humidity level but the motor would never run. Take the unit apart, clean it out and follow my instructions. It should fire up (Mine is running right now :) )
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"Take the humidistat out of the humidifier and look for the 3 slits below the restart button, take a hair dryer and send some warm air into those slits for 5 minutes. That usually recalibrates the humidifier."
Found a hairline crack in the water canister. Had to locate by filling the canister and waiting for a couple of minutes for water droplets to form outside the canister. This ever so slight crack allowed air to enter the chamber and made changes to water dispensing rate which overfilled the resevoir over time ( hours). The cracks were not visible under 10X magnification without the water droplets.
I found a solution to our problem with the fill cap failing/leaking. It was/is not the cap, it’s the gasket/grommet/o-ring. Remember “THE MAGIC BULLET”, well the gasket, that’s where you tighten the top to the bottom, some are white and some are black, THEY FITthe Honeywell HWM450!!! ------- Problem solved. SEE EBAY: NEW AUTHENTIC MAGIC BULLET 4 REPLACEMENT GASKETS SEALS
Turn on furnace and urn up humidistst to call for it. Tube from solenid to the filter should have water running if water is up to the valve and solinoid is opening . It should be warm to your touch., Using an ohm meter you can sheck the coil it shuold have continuity.
Thanks for your question, Sounds to me like you have something partially cloging the misting nozzle, if you can take the nozzle off, and check it I would bet there is something that got in there, if you cant, it might be better to just return the Humidifier where purchased for an exchange, if you can get the nozzle off, if you have a can of compressed air like they sell for dusting off computers, I would use a very short burst of that in the nozzle, and in the feed line, thanks again for your question, let me know how it works out, mr.grzz
Unplug the unit (safety first), remove the two water jugs at the back lay them down. Find a tray large enough to fit the motor and filter inside of it put it next to the unit. Lift off the motor and set it next to the tray, lift out the filter and set it into the tray (in might be wet, and we wouldn't want a mess). Look for a small plastic tower in the base, inside that tower is supposed to be a float with a screw threaded into the top. If there is no screw, grab a small one that is about 5/8" long and screw it in about 1/4" put the filter and motor on, verify that the motor is sitting evenly on the base. If it isn't, turn the screw colckwise 1 full turn and recheck the motor/base fit. When it looks even, put the motor back on, plug it in and hope for the best!!
Take your time and don't forget that this is not a precision machine, so some 'adjustments' are necessary
The filter should be located below the tank. the tank should lift off of the unit and there should be a rectangular cavity where the filter fits. You will most likely find the old filter dried up and filled with a white crust. That is salt and other minerals in the tap water that the filter catches.