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Aprilaire 600 "on" light doesn't come on

I changed the media when the humidistat said to change it. I turned off the humidistat, removed the old media, put new media in, and turned on the humidistat. I noticed that the "on" light ...
Eddy's user avatar
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Is this mold in my furnace humidifer?

I recently purchased a home and noticed this inside my furnace's humidifier: The home has been vacant for at least 6 months, and I hope that this is only due to it sitting unused for so long. It is ...
PenMonk's user avatar
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1 answer
25 views

How do I fix a noisy humidistat/relay?

I have a Rudd furnace with a Honeywell home humidistat. It seems like when the humidity in the house get to the same setting that the humidistat is set to, that the relay opens and closes about a ...
Keith Miller's user avatar
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Aprilaire 600M wiring help

I'm new to the forum and I noticed that this is the place where people ask for tips and instructions with anything to do with HVAC... I figured I would give it a shot since it seems everyone is ...
syncmastet's user avatar
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1 answer
91 views

Is it acceptable to wire a humidifier to my gas furnace using just the W & C wires in the control board?

I'm looking to install a AprilAire 500M humidifier on to my furnace with the main goal that the humidifier switches on only when the heating switches on. I'm not looking to have the humidifier work ...
Anton's user avatar
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1 answer
130 views

How to wire AprilAire 500

I replaced my AprilAire 500 with a new one of same model. I can’t remember how to connect the yellow wires from the humidifier. I’m uploading a picture of all the wires coming to the circled area ...
Sue's user avatar
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1 answer
92 views

Aprilaire 56 humidistat not turning on for low humidity

My humidifier is mounted in the return air duct and the humidistat is mounted in the same duct a few feet before the humidifier. I did two tests while the air handler was running and calling for heat: ...
Debugger89's user avatar
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0 answers
151 views

Whole house humidifier not operating

I have a two part question focused to get my Aprilaire 560 humidifier operating. First, I've deduced that the solenoid valve is not getting power. During furnace operation (carrier heat pump and gas ...
Patrick's user avatar
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1 answer
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Furnace wiring diagram: HUM 120 VAC or 24 VAC can be used

On my furnace wiring diagram located on the inner cover, it states that the HUM dry contact terminals can use either 120v or 24v. How is this possible? There is no reference to how to switch this. ...
Robert Kearns's user avatar
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1 answer
56 views

Is there a category of ducted HVAC/IAQ parts but sized for what is typical for ductless systems? [closed]

There's old houses with extensive remodels that are in need of some kind of "zoned" help in interior air quality (or "IAQ", I'm not sure how common this acronym is just yet), ...
MacGuffin's user avatar
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379 views

How should I connect a humidifier to a furnace and Ecobee smart thermostat?

I have a Goodman GMVC950704CXAB furnace connected to “humidistat HSA 100 humidity dialer” which then connects to HSA 044 then connects to humidifier water valve. I would like to replace HSA 100 with ...
Glabella's user avatar
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1 answer
97 views

Humidifier Fill indicator blinking when it has plenty of water [closed]

I have a Kenmore Quiet Comfort humidifer that I've had for I don't know how many years. Today I replaced the filter, and after I restarted it the F indicator was flashing, which is supposed to mean ...
Barmar's user avatar
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2 votes
3 answers
1k views

Should my humidifier be able to maintain 38% humidity in the winter?

I had an Aprilaire AA700M humidifier installed on my gas furnace last year. Everything worked fine from what I could tell. Fast forward to this winter, and the humidifier isn't keeping up with the ...
mmathis's user avatar
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1 answer
155 views

Shower as humidifier -- yea or nay?

During the winter I often do not run the bathroom fan during/after a shower, figuring the house can use the additional humidity. Of course that means waiting for the water vapor to diffuse out of this ...
keshlam's user avatar
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2 votes
2 answers
2k views

How to connect water supply to central humidifier

Upon troubleshooting the central humidifier, I realized that it isn't connected to a water supply line (new property woes). One end of the flexible copper pipe is connected to the humidifier and the ...
eszed's user avatar
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1 answer
138 views

I have a propane-fired forced air heating system. Is there any reason why I shouldn't install a humidifier in the air duct?

"A friend" said that installing a whole-house humidifier in the forced air ducts of a propane-fired was no-no. I'm imagining that the humidifier can't tell whether the passing air is heated ...
Arlo Gueswith's user avatar
2 votes
1 answer
2k views

Does my furnace humidifier need a transformer?

I'm installing an Aprilaire 700M Humidifier in a Bryant 340MAV Furnace. I looked up the furnace manual and it states: A quick-connect terminal (HUM) and screw terminal (COM24-v) are provided for 24-v ...
kthornbloom's user avatar
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0 answers
507 views

No Power To Humidifier

Hoping an expert here can help me out with an issue. I have a Goodman GMV9/GCV9 furnace and a General Aire 1042-L humidifier. When I went to replace the filter for the humidifier, I noticed it was dry ...
johnnyb17's user avatar
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1 answer
636 views

What happens to quarter valve when I don't turn it on/off completely?

I have a quarter valve for the supply line to my whole house humidifier (fan-powered, by-pass type). It is on when pointing up (i.e. 12 o'clock) position and off when pointing to the right (i.e. 3 o'...
Tony B's user avatar
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1 answer
929 views

Water in duct after installing steam humidifier [closed]

I had a steam humidifier (Aprilaire 800) installed a few weeks ago. It's controlled by an Ecobee thermostat. The steam dispersion tube is in a vertical return duct, above the air filter. Below the ...
mrog's user avatar
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-1 votes
1 answer
442 views

How do I know if humidistat is working?

Is there a way to test an Aprilaire humidistat to see if it works? I switched out the solenoid and it still does not work.
Douglas's user avatar
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1 answer
339 views

mold on window sill due to whole house humidifier

In the winter my house's humidity naturally drops to 20%. We had a whole house humidifier installed and raised the humidity to 35%. The air is much more comfortable but we get condensation on the ...
Reinstate Monica's user avatar
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0 answers
785 views

I replaced the cylinder on my Honeywell HM750 but the 'replace cylinder' light is still on

This is regarding a Honeywell HM750 Humidifier, I installed a couple of years ago. I just replaced the cylinder for the first time. Followed the instructions to the letter, and I checked the ...
grbonk's user avatar
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1 vote
1 answer
625 views

Wiring help for Generalaire humidifier

I’m installing a Generalaire 1042 drip humidifier. The wiring instructions aren’t that clear/detailed. The thermostat is MHX3C. It has connections C, NC and NO. The furnace is a Keeprite C9MPD075F12B1....
Oldoldhouseguy's user avatar
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0 answers
48 views

Furnace will occasionally not turn on unless thermostat temp is increased

Occasionally (mostly in the morning) my furnace will not turn on. I have it set to 72. When I wake up the house temperature has dropped to say 64 or 65. If I turn the thermostat up to say 74, the ...
Oldoldhouseguy's user avatar
0 votes
3 answers
177 views

Problem with water rushing through whole house humidifier

I have a Honeywell Enviracaire Elite whole house humidifier Model HE365A1006 connected to my HVAC system. When the furnace runs, the water is rushing straight through the middle of the water panel ...
Vanessa's user avatar
0 votes
0 answers
165 views

Aprilaire 600 to Fedders furnace

Wiring issue. I have installed the unit, an Aprilaire 600. When the humidifier is OFF, the heat and fan operate normally. However, when the humidifier is ON, the heat and fan come on normally but ...
Eddy's user avatar
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0 answers
30 views

Adding a humidifier with oval-shaped duct on return

I have an oval return duct. Can I mount an Aprilaire 600 humidifier on supply side of furnace?
Ron's user avatar
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1 vote
1 answer
306 views

Can I put steam humidifier nozzle above the AC coils

I'm trying to understand how the AC coils drain the condensation. I have installed a steam humidifier and connected to the top plenum above the furnace and AC coils. My worries are if the steam will ...
Grasper's user avatar
  • 434
2 votes
2 answers
469 views

Swamp Cooler AND Humidifier in One System

I am moving to Colorado, where having a whole house Evaporative (Swamp) Cooler is both effective and low cost option for cooling my home. Additionally, Colorado is drier, so a whole house humidifier ...
PipperChip's user avatar
1 vote
1 answer
1k views

Aprilaire 400 solenoid valve gets stuck at opening resulting in buzzing (hammering?)

I meticulously DIY-installed this humidifier with automatic control 2.5 years ago. It worked as a champ for 2 winters. Supplied saddle valve never sat well in my stomach, even before I read up while ...
Astrogator's user avatar
1 vote
1 answer
3k views

How To Wire Humidistat and Humidifier - Honeywell

I am looking for advice on how to wire my new humidistat with my furance and humidifier. First, here are the components I'm working with: Furnace: Carrier WeatherMaker Infinity (Model 58MVP100 14120) ...
Nick's user avatar
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1 vote
0 answers
743 views

What wires do I need to connect to get Aprilaire 600 working?

I just replaced an old Aprilaire with a new 600 model. I wired up all the previous wires to the corresponding spots on the new controller, but there are still open spots and when I turned power back ...
coreyg's user avatar
  • 159
1 vote
2 answers
429 views

How to Break Apart an Unbreakable Humidifier to Clean It

My humidifier of less than 1 year of use no longer works and Google says to clean mineral deposits. How do I break it apart to clean it and get it working again? When I google this, it doesn't show my ...
Marium's user avatar
  • 135
2 votes
1 answer
2k views

Run humidifier while furnace is not heating but fan is running?

I've got a bypass humidifier mounted on my gas furnace, and an ecobee 3 thermostat driving both furnace and humidifier. What I like about having the ecobee drive the humidifier, is that it knows the ...
Betty Crokker's user avatar
1 vote
1 answer
341 views

Carrier Weathermaker 9200 Humidifier Ecobee blows 3amp fuse

I have a Carrier weathermaker 9200 with a bypass humidifier attached. I just moved into this house a year ago and the humidifier never worked with the humidistat. I tested the solenoid by putting a ...
zhouse28's user avatar
-1 votes
2 answers
149 views

Humidifier connected to water supply WITHOUT a furnace

I want a humidifier that's connected to the water supply but I don't have a furnace (I have baseboards). Does that exists? I just want a humidifer that I don't have to refill every day or so.
Philippe Carriere's user avatar
1 vote
1 answer
337 views

Wiring in a Aprilaire 500m to an older (11-86) Trane furnace w/o A/C

New here. I recently purchased a Aprilaire 500m with a humidistat installed on the return. It's working fine, sure... But I don't want water pouring down the drain while the furnace/blower is not ...
Flywood's user avatar
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2 votes
0 answers
46 views

Safe to install humidifier above furnace gas vent?

I'd like to add an AprilAire 600 bypass humidifier. I plan to install the humidifier on the supply plenum, and the bypass duct on the return air. The gas vent coming off the furnace is type B. ...
zwiebelspaetzle's user avatar
1 vote
1 answer
47 views

April Aire 600 Humidistat Question

The humidistat was replaced. The wiring looks the same as it did before. However, the solenoid only opened when the blower was on. Now we hear the solenoid opening at all times of the night whether ...
Roger's user avatar
  • 11
0 votes
1 answer
364 views

Why does my humidifier not come on when heat is on?

Our HVAC setup includes a humidifier, but the control board seems to activate it only when the fan is on without heat/cool. Here's how I got to that conclusion: I hooked up my multimeter to the ...
Ricardo van den Broek's user avatar
1 vote
2 answers
114 views

Why did my humidifier water bottles get discolored inside?

I've had a stand alone type of whole house humidifier for many years. It has two 2.75 gallon white plastic water bottles. In addition to using an anti-bacterial with each fill-up, at the end of each ...
Not_Einstein's user avatar
1 vote
1 answer
2k views

Aprilaire 600M Wiring to Honeywell TH8321 Stat

Very rookie DIY guy here...I have installed an Aprilaire 600M but can't figure out how to wire it. My thermostat currently is using the U1 port for a normally-closed damper on a fresh air intake. I ...
T Prince's user avatar
1 vote
3 answers
9k views

Why place humidifer on cold air return

I'm trying to understand why a whole house humidifier is placed on the cold air return where water is injected into the air flow and then it has to pass through a five inch filter before entering ...
Rick Lampman's user avatar
3 votes
2 answers
5k views

How to troubleshoot a leak in an Aprilaire humidifier?

An Aprilaire 600M humidifier attached to my HVAC vent is leaking very slowly, about 2 ounces per day. I have not seen it leak but the leak is coming out near the exhaust at the bottom of the plastic ...
Yehuda_NYC's user avatar
  • 1,361
2 votes
0 answers
260 views

Humidifier not keeping up with HRV

I just moved to an new (for us) house and we seem to not be able to keep the humidity up in the house. The house comes with a Heat Recovery Ventilator (HRV) that in the winter runs all the time on low ...
user125857's user avatar
2 votes
0 answers
36 views

Should I expect a whole-home humidifier to provide consistent humidity throughout a 3-story townhouse?

I'm looking to install a whole-home humidifier in my 3-story townhouse in northern Virginia. I already have trouble keeping a consistent temperature throughout the 3 stories - should I expect similar ...
mmathis's user avatar
  • 8,872
0 votes
1 answer
142 views

Piping humidified air through a wall

I have very low humidity in an upstairs bedroom. For various reasons I cannot keep the door closed, so your average "single room" humidifier doesn't move the needle. It's a cold climate, so ...
David Doria's user avatar
1 vote
1 answer
99 views

What skills and tools do I need to install a whole-home humidifier?

I'm looking to install a whole-home humidifier and am wondering what tools and skills are needed for the job. I'm specifically concerned about a non-standard installation or if something goes wrong / ...
mmathis's user avatar
  • 8,872
0 votes
1 answer
913 views

Winter damper setting for humidifiers [closed]

Problem: My brother has a drum humidifier on his furnace and is quite satisfied with it, so I installed one on my furnace this fall. He claims it is a good idea to partially close the damper for ...
Mel Klassen's user avatar