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Question DetailsAsked on 12/8/2013

how much should it cost to replace a drain hose on a new dishwasher

my new dishwasher wont drain. it's still under warrenty i called someone from lowes had the pump replaced found a clogged hose and fixed it. it is now plugged again. was told warrenty won,t cover the hose. it needs a bigger hose. h
who do i call and how much will it cost

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2 Answers


I know the dishwasher companies like to boast how all you have to do is put the dishes in the washer but you really should at least scrape off the plates before putting them in. I usually rinse as well, it sounds like this may be your first dishwasher. There are slightly larger hoses available at Lowes or Home Depot but most all dishwashers start off with the same size outlet pipe and the tailpiece on you sink is about the same size. I am wondering if whoever installed the dishwasher may have a kink in the hose somewhere. I just remodeled a kitchen where the existing hose was only connected to a 1/2 inch copper pipe and never was blocked up. It was a long run to the sink so when I reinstalled it I used a larger PVC pipe to connect it due to the fact that they are smoother inside. As I said it sounds more like an install goof and not the size of the pipe. Depending on your area it should be a minimum service call probably around $100.


Answered 5 years ago by ContractorDon


Millions of dishwashers work fine without clogging, so unless it is an install or factory defect problem I would look elsewhere than hose size.

Like previous comment said, look for a kink in either of the two discharge hoses - from dishwasher to air gap, or air gap to discharge point.

Assuming not a kinked hose, my guess - about 10% chance it is food debris clogging the air vent - occasionally under the sink (BAD place for it) otherwise mounted in the sink or right behind it - looks something like this -,491297

The cap usually pulls straight up and off but occasionally threaded for a turn or so- see if either tube is clogged, or if water comes out here when the dishwasher is discharging. If water does NOT come out there while pumping out, then discharge port from pump is blocked, inlet is blocked inside dishwasher, or discharge hose is blocked or crimped. If water DOES come out at the airgap then second hose from airgap to drain is the problem. (PS - some areas use Johnson gaps - which basically vent outside, so is under sink rather than throgh the top of the sink. Other areas allow use of a "high loop" in the drasin hose rather than an air gap - which tends to trap food particles and plug up, and also is pretty useless in preventing backflow because the loop is nowhere high enough to prevent backflow - have to be about 25 feet high ! to do that, but some things in the code are in there just to accomodate lazy contractors.

My second guess - 90% chance it is plugging at the outlet of the drain hose, commonly into a "barb" or male connector relatively high up on the side of the garbage disposal but sometimes to the drain pipe as shown in the referenced article - 6th picture in Source article shows the top half or so of a garbage disposal, with the dishwasher line (semi-transparent whitish ribbed hose coming in from left side with black hose fitting and hose clamps). The manufacturers ignore basic hydraulics and instead of using a connection where the hose would fit INSIDE the connector, it goes over the outside - so food and gunk plugs up at that "barb" on the housing and blocks the hose over time. Disconnect hose, clean out hose end blockage with tweezers or probe then a long twist of paper towel, clean barb inside and out, reassemble. Do NOT run garbage disposal with the hose disconnected - will pump dirty water from disposal right out the barb.

Permanent solution (legal in most areas) which I use instead of going through the garbage disposal is to plumb the dishwasher outlet directly to the sink downpipe, above the trap, using an angled wye rather than the 90 degree, which sink garbage can enter and plug up, like is shown in the referenced article. Of course, you have to cap off the barb on the garbage disposal if you do this. Unless you put fully dirty, unrinsed and unscraped dishes in the dishwasher (a BAD idea, by the way), the food particles coming out the dishwasher hose are small enough they do not need to go through the disposal anyway, so routing direct to the drain pipes does not cause a problem.

I would not use a bigger hose - first it will not fit your airgap, secondly a larger hose means less velocity during pump out so it will not carry food particles along or self-clean as well, and thirdly it will hold a lot more water in the hose between the dishwasher and the airgap, so when the pumpout phase ends that water will run back into the dishwasher, leaving a pool of water in the bottom to go stinky, and also to contaminate the next washing cycle.

Your solution to drain hose problems is a plumber, or do it youself - just remember the hoses will have water standing in them, so be prepared with pans or bucket to catch it - undo hose clamps, then as you pull it off hold your finger over the ends until over a pan to catch the water. Total volume will be less than about a quart per hose.

I wonder why you got rid of the previous dishwasher - did it have drainage problems too ? Maybe blocked hose was its problem too - though 20-20 hindsight on this does not help any at this time.

The solution if you want to pin it down to the hoses or the dishwasher is to (this assumes hose from dishwasher to air gap is new with dishwasher, so presumably clear) disconnect the discharge hose from the airgap and hold it down into a large bucket or the sink (if long enough) while the dishwasher discharges water - if it comes gushing out, then second hose or airgap is the problem, if not then first hose is plugged or dishwasher has a manufacturing defect, which should be covered under warranty (including hose if new homse that came with dishwasher was installed when new washer was put in). IF the discharge hose does not have any water in it when you disconnect it from the airgap and try to drain it into a pan, then there is a blockage at the pump or the dishwasher inlet.

Since, as I read your question, when the pump was replaced a clogged hose was found, it implies it worked for a bit, then clogged again, This would mean the problem is in the hoses and their connections,, or at the airgap.

Assuming no new parts are needed, a plumber can probably fix this in about 1/2 hour - so minimum service charge of about $75-150 except up to $250 range in high-priced cities. To add in replumbing to bypass the garbage disposal (legal in most but not all jurisdictions) probably another $25 parts or so, and from zero to $75 extra labor.


Answered 5 years ago by LCD

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