I've had this issue since I bought my house. The house was renovated when I bought it, with new washer/dryer unity (not a high efficiency). The smell isn't all the time. Some days there is no odor. It seems to be more of an issue in the morning. The washer/dryer is situated in the basement. Is this a plumbing issue that can be easily fixed? I did notice that, when I pulled the unit out of the closest its in, there was a vent cover. When I removed it, there was a PVC pipe extending up, with a cap on top that said "Sure Vent". Is that normal? Why would this vent into the room? I've attached a photo of the setup, if that helps. Also, the tube from my HVAC condenser pump empties into the drain as well. The metal tubing on the left side of the photo is just the dryer vent resting against the wall. Any insight would be helpful!
The Surevent that you see is an air admittance valve, meant to allow air IN to your drain line when water is draining. This valve helps compensate for the low pressure situation in your pipes. If there’s no pressure equalization, the rush of draiining water will, “suck,” connected p-traps dry….allowing for nasty odors to infiltrate your home! 🤮. Mechanical air admittance devices can fail. I’d suggest installing a, “non-mechanical ,” Studor brand, air admittance valve. Good Luck 🍀