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.
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.
Various fitting degrees
Either you have a blockage present or your vents on your sewer lines have become blocked or you need to install more vents.
Install a one way check valve in the line from the house to the sewer.
Several potential causes could be contributing to the sewer smell outside your house, such as a blockage in the sewer line, a damaged sewer pipe, or a problem with the sewer vent. It is recommended to contact a professional plumber to inspect and address the issue promptly.
The sewer smell in your house after rain may be due to a backup or blockage in your plumbing system, which can cause sewer gases to escape into your home. The rainwater may also be causing the sewer lines to become overloaded, leading to the smell. It is important to address this issue promptly to prevent any potential health hazards.
ummmmm............. your not supposed to i suggest you get that checked!!
I have seen this where water has leaked into the ductwork and stagnated.
To effectively get rid of sewer smell in your house, you can try pouring baking soda and vinegar down the drains, cleaning the drains with a mixture of hot water and bleach, using a sewer gas odor eliminator, checking for any leaks or blockages in the plumbing, and ensuring that all plumbing fixtures have water in their traps to prevent sewer gas from coming up.
Code there doesn't always require a 'P' trap to hold water and thus block sewer gases from backing into the house.
A sewer smell in the bathroom is usually caused by a dried-out P-trap, which is a curved pipe that prevents sewer gases from entering the room. To resolve this issue, pour water down the drain to refill the P-trap and block the odor. Additionally, check for any leaks or blockages in the plumbing system that may be causing the smell.
Possible causes of a sewage smell coming from the bathroom sink include a dried-out P-trap, a clog in the drain, or a problem with the sewer venting system.
To get rid of a sewer smell in your house, you can try pouring baking soda and vinegar down the drains, checking for any clogs or leaks, cleaning the drains with a mixture of hot water and bleach, and ensuring that the plumbing vents are clear. If the smell persists, it may be best to contact a professional plumber to investigate further.
A sewer smell in the laundry room can be caused by a dried-out P-trap, clogged drain, or a damaged sewer line. To resolve it, try pouring water down the drain to refill the P-trap, clean the drain with a mixture of vinegar and baking soda, or call a plumber to inspect and repair any damaged sewer lines.
Change the wax seal under the toilet
A sewer smell coming from your sink could be caused by a dried-out P-trap, a clog in the drain, or a problem with the sewer vent.