💡 Aprilaire 4040 Solenoid Valve Voltage Review

My original solenoid started making a loud noise that could be heard throughout the house as water was flowing through it. Works well - just loud. I bought this because I thought I would be doing myself a favor by buying a genuine Aprilaire piece. It was October 2020. Tonight I went into the basement and found a large puddle of water under the humidifier. Upon closer inspection, the water was flowing quite heavily from the back of the solenoid. Luckily I saved the loud original for just such an

Our humidifier hasn't worked in years and when we called HVAC service recently the guy checked it out and said our solenoid valve had failed. My work almost fell over when he gave me a $277 price to replace it! It was more than we paid for the entire humidifier! Thanks to Revain and some helpful YouTube videos, the fix was easy and took about 15 minutes. Now our humidifier pushes moisture out and I can actually hear the water coming out when the oven is turned on so I know it's working. If you…

My Aprilaire 700 has stopped working. There was no water. The solenoid did not click. The red light on the humidistat is on. Well, that turned out to be two separate problems. My outside temperature sensor was severed in early summer (Ah, that's what the cable was for!). Fixed it with the replacement part and now the solenoid. It was recommended to check the voltage (24V) on the yellow wires going to the solenoid, but I took the chance and replaced the solenoid. Bingo, it works ie. presses, but

My humidifier stopped humidifying and I called my installer for a diagnosis. He confirmed that I needed a new solenoid and that the installation would cost $200 in addition to the $50 for the tech visit. That's the cost of a new humidifier! Bought this new solenoid and installed it in 10 minutes. Very simple, and I'm not a practical type. Unscrew the old one, remove the water fittings and nuts, then install the new one. Always ensure the water supply line to the humidifier is disconnected and…

After 21 wet winter seasons, we found that our Aprilaire 560 was not up to the task this year. We quickly determined that no water was getting onto the water panel and promptly ordered an Aprilaire OE replacement. The first thing we noticed was that the part appears to have been heavily redesigned - instead of a solid brass body, the new block is a lighter cast. However, there were no issues installing it, which was reassuring. I noticed that the size of the "hole" of the replacement does not…

Poor score as some parts are missing and no parts list to review. The block was fairly easy to install and worked well. Except that I had way more water flow than before and that would have resulted in enough water splashing that some of the water would have spilled all over the bottom of the humidifier lid. I didn't know at the time, but it must have come with a small plastic insert that fits into a tube on the "OUT" side of the solenoid that limits the water flow to the level the humidifier…

This is an Aprilaire original solenoid. It's cheaper than the Aprilaire website. I had an Aprilaire 700 installed in August 2015 so the part was still under the 5 year warranty. Aprilaire will only honor the warranty if you contact the product installer as they told me when I called. I found this unsatisfactory as it is a simple replacement and there was no way I wanted to pay $125 for a one year warranty installer to come and install this part. This requirement for the installer to replace the