Sounds like the trap in the sink is getting the water pulled out of it. It probably wasn't vented properly.
YES, you do need a trap. Usually the bathtub drain is on the same sewer line as the nearby toilet.The smell from the toilet's discharge will sneak up through the bathtub's drain line without a trap ... not pleasant!.
Either you have a blockage present or your vents on your sewer lines have become blocked or you need to install more vents.
It could be that the condesate drain line has been connected to the wastewater/blackwater stack. The trap (hopefully installed) preventing sewer gas from moving up the condensate line may have dried out. If dry, sewer gasses are no longer blocked by the hydraulic seal... resulting in a nasty smell when the unit is turned on and the fan kicks in. Just a thought.
Only if you want to smell the fumes all the time. Code says it should be through the roof or above the edge of the roof.
Yes, my brother's house in CT. has the same issue and the cause is still undetermined. I initially thought that the house was so tight, that the fireplace "draw" was pulling the gas right thru the traps. That does not appear to be the case as the smell doesn't appear to be coming from the sink. He doesn't know of any vent inside the house, that could explain this. I'm going to suggest that he crack a door or window in the family room and see if that short circuits the draft and has any effect.
You may need to replace the wax seal under the toilet.
If you are on a septic system, it is plugged.
Change the wax seal under the toilet
you most likely hve a bad seal at the wax ring.You did replace it when you replaced they toilet diden,t you?
new york smells like a sewer,most people explain it as a toilet bowl
Most likely a drain has dried out and there is no water in the trap to stop the gas from coming up. Sink, shower, or main floor drain.
If there's a basement floor drain close by, sometimes the all the water can evaporate out of the trap. This can allow sewer smells into the house. Just run some water thruough the floor drain to fill the trap back up. Ditto for any drain that doesn't get used very often. More input from FAQ Farmers: * Maybe the vent in the wall isn't connected properly or came apart. I would think you'd have a sewer smell all the time but maybe it just gets bad enough when things get stirred up to notice. * Vent pipes are a major source of sewer odors. Vent pipe filters eliminate these odors while removing greenhouse gases. Used zeocarbon is then put back into the soil.
Awful.
Awful.
The trap in the drain line under the sink is dry. It should have water in it to stop the smell
Lime
It could be a bad wax ring. I would start by replacing that. also check the vent on the roof to see if it is clogged with anything