Everything seems to be working - installed a new water panel today - but the humidity level remains at about 30%.

If you are using the misting type humidifier rather than the wick-type. there could be a blockage in the misting aperture. These units clog easily, and it is best to use distilled water in them since mineral deposits can clog the aperture.

Installed how recently, by whom? Call installer!

Malfunctioning, defective or both

First check humid-stat setting make sure that the room is not above setting. Second check that float(water level) switch is being made. Hope that helps

you need to make sure your humidity level in the house isnt higher then what your humidifier will provide at any givin outdoor temp. this chart is in the owners manual. you cant remove the wires going to the ODS or it will give an error unless you have a resistor to put in its place. Anyway if the humidifier works in test mode according to AA it works so you may have higher humidity than you think, the highest your gonna get is 45% as the temp outside drops it will allow less humidity so it doesnt cause window condinsation (property damage) here is a copy of the chart. the #s on the left are the dial setting
TABLE 2 – % Relative Humidity Guide
Outdoor Temperature (°F)
-10°F 0°F 10°F 20°F 30°F 40°F
1 10% 10% 10% 15% 20% 25%
2 10% 10% 15% 20% 25% 30%
3 10% 15% 20% 25% 30% 35%
4 15% 20% 25% 30% 35% 40%
5 20% 25% 30% 35% 40% 45%
6 25% 30% 35% 40% 45% 45%
7 30% 35% 40% 45% 45% 45%

The most probable reason that the humidifier does not reach the levels you describe is because you said you had the unit in your bedroom.

Bedrooms typically contain materials that are known as "hygroscopic." What that means in plain English is that items such as the bedding, mattress, any carpeting, wood, curtains, you, etc. all absorb moisture , kinda like a sponge. Since that moisture is being held by these materials, the air itself contains less by percentage. 25-30% humidity is actually pretty good for any room, especially in colder climates and higher humidity levels can lead to the production of mold, condensation on windows, etc., which are not good things. The good news is that reasonable humidity levels are healthier for textiles such as carpeting, cloth, and so on because the fibers won't dry out and crack. Dust is also reduced, but again, only to a certain level.

If your humidifier is reaching 30% it's probably working ok.

Hopefully it was installed properly. It should only allow water to run when the furnaces blower is on. The outdoor probe can only be properly checked with an ohm meter. When you replace the evaporative panel, it is very important to have the dark painted mark on the "top" of the panel when it is installed. They do not give these instructions to a homeowner, only a contractor. So i am betting that your new water panel is installed upside down.
Good luck

You should take out that aprilaire and throw it in the garbage or return it to who you got it from. Ask them why they didn't offer you the best humidifiers available. The only way to truly control humidity in your home without running your heat is a steam humidifier. Autoflo makes a good one also honeywell makes a new one. I have installed a honeywell tru steam in my own home and a few customers it hasn't lived up to its advertising. The auto flo has never given me any problems with customers.

Try the following test, ( I will resume this is a flow through humidifier)

Spray water directly oin the filter make sure it is saturated. Some water should leak from the bottom. After 10 min measure the Humidity to see if this helped. If there is a higher level of humidity the pbm is that not enough water is saturating the filter. Check the level of the filter & water feed nozzle.

Option 2 is to connect the water feed tube to a Hot water source.

Hope this helps.

My guess is that you are trying to bring the humidity up too high. There is a chart in the manual that suggests where to set the humidity at based on outdoor temps.

I try to keep the level at 30-35% in the winter.

Hope this helps.