There are three common reasons why you could smell sewage in or around your toilet or bathroom: The first is a dry trap. This happens when a toilet isn’t used for a long time. The water in the pipe dries up, allowing the sewer gas to back up into the toilet. The gas rises through the water in your bowl and out into the room.
B Open the cold water inlet supply to the heater fully. B Open a hot water faucet to permit the water to fill the heater and the piping and to eliminate the air trapped