Jim Elbrecht wrote:

I've had this Whirlpool 1200 dishwasher for about 6 yrs now.

Every couple years it eats an impeller/chopper and I've gotten pretty
good at tearing it down & replacing the thing.

A couple months ago it started a new problem. Every once in a while
there would be [pretty clean] water standing in the dishwasher at the
end of the cycle. [i leave them in over night- it was there in the
morning]

Nothing was leaking so I figured it must be the drain pump- as the
overflow was working somehow. So I got a new pump and all was well
for a while.

Next time there was water standing in it I tried blowing back through
the hose where the drain goes into the disposal. Bubbles came up
in the dishwasher- and it drained when I hit the cancel button.

A couple weeks later it clogged again. This time I thought I'd try to
suck the clog through the pipes. Hooked shop vac to drain at
disposal- tried to suck for a couple minutes. It wouldn't budge. But
I could still blow into that pipe with just a couple pounds pressure
and clear the clog.

Now it is leaking out a little bit during the cycle. Sometimes it
seems to clear itself- as I'll have a puddle, but the drain will be
working by the end of the cycle.

Seems it was 2 problems. The intermittent clog was a little rubber
flapper of a check valve that had come apart-

http://www.appliancepartspros.com/pa...odel_id=503862
part number 5 on the pump and motor parts diagram [Part Number:
AP3152971 ]

I tore things down to where I could see the inlets to both pumps and
ran 3 cycles before it clogged again. Then I blew like hell on the
drain hose back towards the dishwasher, and the little rubber disk
appeared.

The leak seems to be a bad door seal. Parts about $20 apiece.

I'll know for sure next week- but I think life is good.

Jim