Question about Dishwashers

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When draining water out of the sink, it backflows into the dishwasher. Doesn't the dishwasher have a backflow preventer valve where the drain tube connects to it?

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Actually no they do not have a back flow preventer, make sure the dishwasher drain connection is installed on top of the "P" trap, if it is then you are having drain problems , remove and clean the "P" trap if it not clodded then you need your pipes cleaned out if it is backing up in dishwasher.. Do it sooner than later or may become totally stopped up..

Posted on Feb 01, 2010

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Posted on Jan 02, 2017

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1 Answer

Can backflow mounted to sink be moved under sink?


Hi Del:
I'm not sure what you mean by "backflow".
How is this related to your dishwasher?
The discharge from the dishwasher has to be connected to the drain from the sink, upstream of the trap that protects the sink.
A hand sprayer is typically integrated with the sink faucet.
Reply as a COMMENT to this post to discuss.
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Hello,
The airgap prevents the water from the sink backflowing into the dishwasher. You could espically if your dishwasher hasa corragated plastic drain hose attach it under the sink so at one point the hose is higher that the nozzle of the disposer it connects to so the hose is still higher that the level of the nozzle and water wont backfill into the dishwasher.

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If you think you have blockage, then take the unit out and disconnect the drain line and take it outside and use a hose on it.

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Your drain hose should be secured up inside the cabinet at a level higher than the base of the sink to prevent water from going from the disposer back into the dishwasher. There is a anti back-up valve in most dishwashers, but they are not totally effective against water from the sink coming back into the machine.
Get yourself some bread ties and get that hose up as high as you can under the sink so that it comes out of the disposer, goes up, and then back down to the dishwasher. This will also prevent crud from getting accumulated at the end of the drain hose where it connects.
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The dishwasher drain line that connects to the garbage disposal or pipe under the sink should be looped above the height of disposal or pipe to prevent
sink water from backflowing into dishwasher.

Most dishwashers have some form of internal backflow preventer inside the water sump assy..
Yours may be degraded or stuck open.


Jan 16, 2010 | Dishwashers

2 Answers

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1 Answer

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I highly doubt a clogged sink drain would cause any damage to the dishwasher. Any backpressure would be relieved by pushing drain water up and into the sink(s).

Sounds like just a coincidence...although very suspicious, I agree.

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I am not a repairman but have installed several duel drawer dishwashers. Most dishwashers have a check valve preventing backflow. Water under pressure will always follow the path of least resistance and in your case it is going into the upper drawer. Be sure the drain is open and flowing easily under your sink whether that be the disposal or a TEE. It may help if the drain line is elevated as high as it can go under the sink just before it reaches the drain. How often do you use the top drawer? Perhaps run a cycle on the hottest cycle without dishes to attemt to clean or force through any contaminants in the check valve through into the drain. Hope this helps, Ken

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Drains Technical Question


Plumbing codes call for a gap between potable water and a drain. This usually looks like the distance between the faucet and the top of the sink or bathtub (one inch or more). Without the "gap", waste water could siphon back into the drinking supply. This "does" happen in situations where a city main is shut off causing a drain-down of the system with plumbing that has been done improperly. Sometimes it is a hose left in a mud puddle, or maybe a hose lying in bleach water. People have died this way. The plumbing code helps protect the general public from these dangers. Current improvements include antisiphon faucets for garden hoses, the air gap for the dishwasher, proper installation of water heater T&P relief drains, and backflow preventers for irrigation systems.

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