Sewer Gass with Bocsh 300 washer

Many laundry machine hoses require a physical air gap, or air break, between end of hose & standpipe drain. This prevents both siphoning & sewer water backup entering washing machine... ( UPC ill. Manual for picture) ... Buzz*

Hi Joe

Is that pex pipe on the right your water supply to the washer?

Your sewer gas smell I believe can be eliminated by putting a P trap in the drain PVC line.

(EDIT)
Where the drain hose from the washer hooks into the PVC pipe is NOT airtight which would allow the sewer gas back into the laundry room!

(EDIT EDIT)
If there is a P-trap in your outflow pipe, the only place left for grey water to collect (and stink) would be between the washer and where the waste hose goes into the drain. We've had to use a little bit of bleach on occasion when we haven't used the washer for a bit.
Hope this helps
-Steve

If the house has been sitting for a long time, the traps may have dried out and are not stopping the sewer gasses from being trapped back, flush all toilets and run some water in all the sinks and tubs, to refill the p-traps, also don't forget to pour some water down the washer drain pipe. HOPE THIS HELPS...

They have cleaners available that will cure this problem.

most of the time when the washer empties and other water devices in the home dispense and the sewer overflows there is an issue with the sewer..if your washer is equipped with a clean out or collecter if there is a problem with that water would be still in the washer b/c it cannot drain...call a plumber

Does it drain into a trap? It sounds like you may not have a trap fitted and the smell from the drains is coming through the outlet pipe?s

Does the sewer drain line have a trap at the bottom that prevents sewer gas from entering the room? If the smell seems to be coming from the washer itself, run a wash cycle empty with a cup of baking soda, detergent and hot water to clean the interior.

IMPORTANT: Read thoroughly. DO NOT add detergent or other laundry products to this cycle.
1. Remove all items from the washer.
2. Open the dispenser drawer and 2/3 cup (160 mL) of liquid chlorine bleach to the bleach compartment. DO NOT use more than 2/3 cup (160mL) of bleach per cycle as this will lead to product damage.
3. Close the washer door and dispenser drawer.
4. Select the Clean Washer cycle or a full wash cotton 104 F wash (40 C). DO NOT use any higher temperature as this will cause unnecessary fumes
5. Press Start and allow cycle to complete.
6. If the bad odour persists, repeat the procedure 1 or 2 more times. This may be necessary if this is the first time you have run this cycle.
7. After the cycle is complete, leave the door open slightly to allow ventilation and drying of the washer interior.
8. Repeat the cleaning procedure monthly.
To maintain the washer freshness:
1. Use only HE High Efficiency detergent.
2. Leave the door open after each cycle to for better ventilation and drying of the washer interior.
3. Use warm / hot water in your machine unless the fabric you are washing requires cold.
4. Use the correct amount of fabric softener.
5. If your laundry room is damp, use a dehumidifier.
6. Clean the door seal of visible residue.

You are probably correct with the idea the sewer smell is not coming from the washer but rahter then drain line. Was this recently installed or has a slow drain down the pipe? There is suppose to be what is called a P-trap installed in the drain pipe to restrict the gases from coming back into your home. Check the drain line. If I can help further, I am here. Eric Campion

When you have problems with sewer gas smells around a
fixture, there can be a number of causes.
1. Sewer gas coming back up into the home
a. Blocked vent.
b. No vent.
2. Leaking drains that cause rotting below the floor.
3. Moisture that causes mold buildup.
4. No trap on your sink.
5. One roof vent on septic system.
6. Toilet needs to be reset and calked.

Sewer gas can come back up into your home, when the
trap completely empties after a letting the water out
of a fixture, when the trap dries out, or when it is
sucked out by another fixture flushing. When water
goes into a pipe, it first has to push the air ahead
of it, if there is no place for it to go, it comes up
the trap. This causes a buildup of pressure if there
is no vent.

If there is a vent, the pressure is relieved up to the
roof, carrying with it all of the yucky smells. When
the water runs down the drain, the air behind it has
to be replaced, if its not, the pipes will try to ****
it from some drain...typically the shower drain, but
sometimes the floor drain when its close to a washer.
When vacuum draws air in through the trap on the
laundry tub it also takes the water out of the trap,
leaving an opening where the sewer gasses can come
back up from the septic system .

Think about your pipes as if they are a drinking
straw. When you put a straw into a glass of water,
the water fills the straw. But if you put your thumb
over the end of the straw and pull it out of the
water, the water (or liquid) stays in the straw. This
shows you, air has volume. When you remove your thumb
from the end of the straw, the water flows back into
the glass. This is the principal of a vent.

So if you only have the smell when a fixture is
running, the trap is refilling after the fixture and
blocking the sewer gasses from coming into the home,
but your vent is probably not functioning.
In addition, if you have only one vent up through the
roof on a septic system, you can get sewer gas smells
coming up through your home. As the wind blows
across the roof, it pressurizes the plumbing system.
Since the septic tank is full of water, the wind
cannot go into the septic tank. So it bubbles up through the
traps into the house. Installing a vent on an
opposing roof pitch, helps to relieve the pressure buildup,
since the wind then is only hitting one side of the
roof.

Floor drains are succeptable to this type of pressure.

If your drains are partially clogged it can work
similar to a clogged vent. Since there is no place
for the water to go, it forces the air, which is much
lighter up through traps, bringing sewer gas into the
home.

If your fixture is not set right or is wabbling, the
traps or wax ring that seals it underneith may not be tight.
When this happens, if you empty the fixture, sewer gas
will come under the sink into the room.

Each of these senarios will require a different
solution. The key to solving your problem, is having
the right questions to ask when the plumber comes out
to look at it. The previous information should
provide you with a basis for the questions you need.

Make sure before you call a plumber to check
cleanout covers and pipes to see if they have
openings to the sewer. If you have an opening
without a trap, you will get sewer gasses.

In conclusion, if you don't have a vent inside the
wall which equalizes the air pressure inside the
pipes, if you are on a septic system with only
one roof vent, if the vent is clogged off due to
sludge and soap scum, if you don't have a proper trap
on your sink, or if the drain is clogged, sewer gas can escape
into your home.

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