Heat pump / sewer smell
Hi everyone... back in september I had a couple of new heat pump systems installed, outdoor condensors, inside air handlers and heat strips. Well I actually didn't use the "heat " setting til about 3 weeks ago.. when I did, I noticed a "bumping or fluttering" sound coming from near the air handler... called the contractor, said it sounded like a dry trap.. came out here the next day and installed a open piece of pvc pipe in the drain below the air handler... now for some reason when ever the heat kicks on we keep noticing a sewer smell.. Could that be coming from that open vent pipe in my hvac drain? How to we go about getting rid of it and stopping the "dry trap" noice at the same time. I appreciate your help.