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We have a new Bosch dishwasher. Do we need an air gap on the drain line?

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Recommended but not always necessary. My DW does not have one.

Posted on Dec 21, 2016

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Posted on Jan 02, 2017

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2 Answers

Dishwasher won't drain completely


perhaps it need that air gap device added .we call it a siphon break here .

Sep 06, 2015 | Bosch Dishwashers

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There are two hoses coming from my Bosch SHE45M06UC dishwasher. One is obviously the drain coming from the back of the unit, and the other is attached to the side looped and not connected to anything. I...


Many people realize the dishwasher connects to a little hose on the sink, it is called an air gap. However, many people wonder " The air gap is there to prevent the water from being siphoned out of the dishwasher. When water flows through the drain hose, it creates a suction on the water still in the dishwasher. The air gap, makes a hole for air to get in. That way, the water only leaves the dishwasher when it supposed to, when it is pumped out. Another benefit of an air gap is that if the drain hose becomes clogged, the dishwasher can still pump out the water. Instead of flowing through the hose, as it should, it can flow out the air gap and into the sink.
The dishwasher's drain line usually connects to an air gap mounted at the countertop level on the sink. The drain line continues from the air gap to either the garbage disposer or directly to the sink drain. If the drainage hose between the air gap and the drain is partially or completely blocked, wat

Aug 28, 2008 | Bosch Dishwashers

1 Answer

Started with E01 and E25


The E01 fault code means that the dishwasher has suffered a power module failure.
The programming of replacement power modules E01 up until E05 has been locked down by Bosch so in the event of an error code of this type it's recommended that you contact a Bosch approved dishwasher engineer.

Apr 12, 2015 | Bosch Dishwashers

1 Answer

My Bosch dishwasher was not installed with an "


From an internet posting ::

The purpose of the air gap is too prevent back-flow and siphoning, and newer dishwashers (past 20 + years) have back flow preventers built in and looping the drain hose (not a circle, but an upside down u to the top of the cabinet or behind/side of dishwasher) prevents siphoning. Aside form being ugly space wasters the cheap air gaps have a tendency to spit and cough water out.


Read more: What is the purpose of an 'air gap' for dishwashers? ' Answerbag http://www.answerbag.com/q_view/92208#ixzz1ACnxhxz3

Jan 05, 2011 | Bosch 24 in. SHU43 Built-in Dishwasher

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What is E24 on my Bosch super silence dishwasher?


Check the air gap! It may be clogged.

There is a great video explaining how to do t linked below.

My air gap was clogged, and after cleaning it the error 24 was gone...

The Diswasher Air gap how to clean it and why it important

Jan 02, 2011 | Dishwashers

1 Answer

Bad smell coming from bottom - water doesn't completely drain out


Make sure the drain hose is not blocked or pinched.Also check where it drains into your sink pipeing to be sure food isnt blocking the drain way.
Its eather the drainage path is blocked or the pump stoped pumping.
Also, the drain hose must be installed so as to have a high spot higher than the sink drain or the water from your sink will be able to "run down hill" or drain into your dishwasher. Take a look and see!

also It sounds like your dishwasher does not have an air gap. Newer dishwashers come with an air gap installed, but they can be taken out. A quick fix for this is to:

Check the drain line under the kitchen sink. The drain line is supposed to run from the bottom of the cabinet, and run as high in the cabinet as you can get, (up to the bottom of the counter top) then connect the drain. This is called an air gap, and helps keep a little water in the drain line, which will prevent sewer gases from entering your dishwasher, and garbage disposal.

Aug 17, 2010 | Bosch Dishwashers

1 Answer

My new dishwasher wont drain


There's a few things you can look into that won't cost you any money.

First, manually remove as much water as possible and then check the sump area for paper or any other large object clogging the drain. A cup or so of water in the sump area of your dishwasher is normal and it is there to prevent the seals from drying out. The dishwasher will pump this old water out before beginning to wash.

Make sure the door is properly latched as the pump will not drain if the door is not latched properly.

Check the belt, drain line, air gap, drain valve and solenoid assembly, the motor, and the pump. If your dishwasher uses a belt to drive the pump, and it has broken or come off the pulley, replace it.



If you have recently installed a garbage disposer in your home, make sure that the drain plug on the disposer has been removed. It's just a little plastic piece that blocks the hole where you hook the dishwasher drain hose. If your dishwasher drains through the garbage disposer, you need to run the garbage disposer before you run the dishwasher to make sure that the drain is clear.

There is a drain hose between the drain valve or pump and the garbage disposal or drain line. If an obstruction has blocked this, then your dishwasher won't drain. The drain hose is connected by clamps to the drain valve and the disposer or drain pipe. Remove it and visually inspect it for a clog or a kink. Try to remove any debris. If it is in good condition, just put it back on, and if not, purchase a new one to install.

If you don't have an air gap in the drain line, at least use a high drain loop. Making a large loop about 18" off the ground with the drain line can prevent any back flow into the dishwasher from the sink.

If you have one, the air gap will be located on top of the sink. The air gap is there to prevent any siphoning of standing water from the sink. When your dishwasher drains, the air gap diaphragm will form a seal and allow the water to drain properly. If the diaphragm in the air gap is faulty, it’s possible that water can leak onto the cabinet and into the sink area. When this happens, then the air gap must be replaced.

Like the inlet valve, there is also a drain valve on most models. When no power goes to the drain valve it remains closed and prevents water from leaving the machine. When the valve receives power during the drain cycle, the solenoid opens and allows the water to leave the machine. If your drain hose is attached directly to the pump, you don't have a drain valve. The motor simply reverses and the pump sends the water in the opposite direction, which is out of the machine.

If the motor doesn’t turn or work properly, the dishwasher may not drain. Make sure you have power to the unit. If you notice that the motor hums but won't turn, it could be seized, and you probably need to replace it.

if you need to buy any parts, I have had alot of help from http://www.apwagner.com
Small objects can sometimes get stuck in the pump. When this occurs, you’ll need to open the pump and remove any debris buildup. The dishwasher pump is usually mounted directly to the motor and runs off the motor as well. The pump is also attached to the bottom of your dishwasher and pushes the water from the dishwasher.

May 08, 2010 | Bosch 24 in. SHE43C05UC Stainless Steel...

3 Answers

SHU43 Bosch Built-in dishwasher


Try running citric acid (3 tablespoons) through.
You can get it from a drug store.
Or, run 1/2 cup vinegar through.
Do this in both the dish washer and the disposal.
After doing this try running some water into the disposal and then see if the next time you run the dishwasher if it still smells.
You could be having a problem with water not staying in the drain trap under your sink that is why if you run water and fill the trap, then you will find out if it was the dry trap that caused the smell from sewer gases backing up into the house trough the garbage disposal.

Apr 30, 2008 | Bosch 24 in. SHU43 Built-in Dishwasher

1 Answer

Diswasher airlock


By the airlock , you mean the air gap? .If the water is coming out of you air gap that means the hose that connects the air gap to your drain is clogged or your drain itself is clogged.Check the hose that connect the air gap to your drain(or disposer), check air gap and clogged disposer opening

Dec 01, 2007 | Bosch 24 in. SHU66C05 Stainless Steel...

3 Answers

Bad smell


It sounds like your dishwasher does not have an air gap. Newer dishwashers come with an air gap installed, but they can be taken out. A quick fix for this is to:

Check the drain line under the kitchen sink. The drain line is supposed to run from the bottom of the cabinet, and run as high in the cabinet as you can get, (up to the bottom of the counter top) then connect the drain. This is called an air gap, and helps keep a little water in the drain line, which will prevent sewer gases from entering your dishwasher, and garbage disposal.



Please rate this solution.

May 18, 2007 | Bosch 24 in. SHU6802UC / SHU6806UC...

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