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My h800b humidistat like blinks and will not allow the unit to run yett the tank is full

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How to stop it from spluttering


The sputtering may be caused by a calcium build up the water system. To solve the problem do the following.

Turn the unit OFF and unplug it.

Empty any remaining water from the tank.

Mix a 50/50 solution of Distilled White Vinegar and Bottled Distilled Water (enough to fill the tank).
Pour solution into the tank and allow it to sit for 1 - 2 hours.

Plug the humidifier in and turn it ON. Allow it to run until the tank is only half full. If the sputtering has not stopped, turn the unit OFF and allow the unit to soak over night.

The next morning, turn the unit On and run for 20 minutes. Turn the unit OFF & unplug it. Pour out the remaining solution and refill with Bottled Distilled Water. Run the unit for an hour. This will flush out the lines. After that, it should run normally.

I would highly recommend using Bottled Distilled Water in the future, rather than Tap Water.

Hope this helped you to solve the problem.

Jul 11, 2011 | Vicks V150SG 1 Gallon Humidifier

1 Answer

Hi, We have a new house fitted with a Honeywell HE225 humidifier. It does not seem to work. Doesn't matter what we set it to, there is still way too much condensation on all the windows. We ended up...


Cut the power to the whole house humidifier and turn off the water pipe to it. If you want it running in the winter, put the water back on, but put a timer or a humidistat on the power cable to only allow it to run a certain amount of time per day, or to only run it the humidistat shows an RH lower than 45 percent (or whatever your comfort level is).

May 27, 2017 | Honeywell HE225B Humidifier

1 Answer

Aprilaire 600 problem


It sounds like you got it...

The solenoid will not open with only 13 volts to it. Jump or apply the full 24-27 volts to the solenoid and see if it clicks and opens and allows water to flow.

If the valve still won't open or pass water, start looking for a plugged inlet solenoid inlet screen or a faulty solenoid valve as well as a faulty humidistat.

Jan 06, 2010 | Aprilaire 600 Humidifier

1 Answer

I have a model #560..turning the humidistat forward until it "clicks" would cause the water to begin flowing..now, after the "click" is heard, the water does not flow into the reservoir. Do you think it's...


turn the saddle valve in and back out. sometimes the small pin hole for the water gets plugged with something over the summer when the units aren't running and just turning the valve in and back out clears it out and allows the water to flow. check to see that you have water flow at the solenoid and if you do then it is probably the solenoid that is bad.

Dec 07, 2009 | Aprilaire Humidifiers

1 Answer

Aprilaire humdiifier not working


Does your humidistat have any dip switches or a small jumper wire? if it does try switching positions of the jumper or change dip switch. hope this helps

Jan 29, 2009 | Aprilaire 700 Humidifier

1 Answer

Fan running but no water flow


the humidistat on this unit just acts as a set of dry contacts. with the humidifier plugged in, you should be able to touch the 2 brown wires by the water solenoid together and get the power fan to run and the water solenoid to enrgize. if you do this and water does not flow, you most likely have a bad water soenoid. it is either electrically bad, or just plugged with water deposits. sometimes you can pull it apart and clean it, sometimes you just have to replace the solenoid.

Jan 26, 2009 | Aprilaire 700 Humidifier

1 Answer

No water to my Aprilair model 550.


Some sump pump have a safty switch that will not let the hum. come on if the tank is full of water, I,m not sure if this is the type that you have but make sure that the pump is pumping water. Also your humidistat have an internal switch that it should be set to bypass not to power Note: some humidifier have their own power supply the 550 dose not

Jan 26, 2008 | Aprilaire 550 Humidifier

2 Answers

Humdifier on furnace


I have the exact same problem. At this time I am looking for a new solinoid (part on the bottom) to install. Anyone else having this problem and know where to find replacement parts

Jan 22, 2008 | Aprilaire 700 Humidifier

1 Answer

Not getting enough humidity in the air


There are 3 things to check on the humidifier. Check the metal mesh screen, is it wet after the humidistat is call? If it is dry the water solenoid my not be opening or the nozzle is plugged. The circulating fan blows air through the wet screen to add humidity. Does the fan spin when the humidistat is calling? There is an intake and exhaust on the humidifier. Check that the metal was cut out properly when the humidifier was installed to allow air to feely circulate?

Mar 06, 2007 | Aprilaire 600 Humidifier

3 Answers

Doesn't run


When a humidifier doesn't run, it generally means it isn't receiving electrical power or the controls have automatically shut it off. 1) Be sure it's plugged in to an outlet that works and that it's turned on. Check the electrical receptacle for power, using a working lamp, appliance, or voltage tester. 2) If the receptacle seems to be dead, check the circuit breaker or fuse that serves the humidifier's circuit. 3) Check the setting on the humidistat. If it's set lower than the room's relative humidity, the humidifier won't go on; in fact, it may take several hours for the humdistat to respond to the room's changing humidity. 4) Be sure the humidifier's reservoir is full of water. 5) Unplug the humidifier unit. 6) Check the power cord. If necessary, repair the cord. 7) Remove the humidifier's cover panel. 8) Remove the humidistat and check it (as shown below). Replace it if necessary. 9) If it still doesn't work, call an appliance repairperson, take the unit into an appliance repair shop, or replace the unit. To check the humidistat, you?ll need a volt-ohm meter. A humidifier?s fan vaporizes the water in the reservoir and blows the water vapor into the house or room. If you need to check the fan, unplug the humidifier, remove the control panel, and lift the lid. Tighten the fan hub with pliers if it is loose; this should take care of rattles. If the fan doesn?t spin easily when you try to move the blades by hand or if it is still noisy, lubricate the motor bearings with oil. To establish whether power is reaching the humidistat when you know there are no problems with the plug or switches, unplug the humidifier, remove the control panel, and lift the lid. Test it with a volt-ohm meter set to the RX1 scale (or to K[omega symbol] or [omega symbol] resistance on a digital meter). Clip the meter to the humidistat terminals. The meter should jump if you turn the humidistat from high to low. If it doesn?t, you?ll need to replace the humidistat or return it to the manufacturer.

Jan 18, 2006 | Honeywell HCM530 Humidifier

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