Dishwasher not draining (Disposal Installation)?

Question

Ive answered my own question but would like to share a few tips 
for those with this problem.
1st, you will need some plumbers putty when you come home from the store with your new disposal..$2. Its not included.

Now suppose your dishwasher will not drain after you think your job is complete.

1st remove the discharge hose to the disposal and point it into a bucket, turn the dishwasher on drain cycle and see if water comes out. It does? Good..that means your line is not clogged, your pump isnt bad, filter not clogged..ect..

Now, Unlike me..read the instructions better next time.

If you are installing a disposal with a dishwasher you will have to KNOCK OUT the piece of plastic in the drain valve on the disposal unit where the hose goes in!
(A hammer and screwdriver works...remove the piece of plastic inside the disposal after)

(They leave it closed off for installations without a dishwasher, so you have to knock out the nickel sized piece of plastic to open the line.)

starzau · Accepted Answer

should NEVER use a hammer and screwdriver to just knock a hole in the spigot! too many times have i seen a pumpkin seen or a nutshell sit up against the edges of the spigot over the screwdriver hole resulting in non warranty callouts and $70+ dollar call out fees. Should always drill the spigot out with an appropriate drill bit (usually 1/2 inch) to the full diameter allowable! Can save an embarassing payment for a techie to drill it out for you. 
NB. hehe, often the first thing the customer says when u get to their house is "I had a friend put this dishwasher in....."

Anonymous · Answer

Welcome to the club. I have gone out on many calls through the years for the exact problem and have caught myself starting to tighten the hose clamp down for the dishwasher connection before realizing that the knockout was not removed yet. Many plumbers do the same thing and you would think that they would know better.

I just read the first line of your question(tip) and knew what you were going to say.

Larry G · Answer

I actually made the same mistake once on a job. The first time I ever installed a disposal. As with much of what I now know, I had to learn the hard(head) way

? · Answer

After you get the disposer in, why don't you just connect the dishwasher hose directly to the disposer itself?

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Dishwasher not draining (Disposal Installation)?

4 Answers