My wife recently purchased a new washer and dryer, I had to do a bit of work on the inlet piping but the drain line is essentially the same as it's been for 20 years. It's 1.5" PVC with an S trap that goes down through the laundry room floor to the main house drain line in the basement. I did have to move the trap a bit closer to the floor (it's about a foot above floor level) to accomodate the new inlet piping. It's been working fine for a couple months, the other day my wife said she smelled something in the laundry room. After so investingation, I found that there is no water in the trap. This has me stumped. There is no evidence of leakage anywhere, so I can't see how the trap would not remain full. Any ideas?
Thankss.
Thankss.