LG dishwasher LDF7551ST E1 error code with actual leak.

[LA Germann]

Apparently, our LG LDF7551ST dishwasher has been intermittently leaking.  This morning there was maybe a half cup of water on the floor, the blue and green lights on the front panel were both blinking, and I could hear the pump trying to drain; the middle spray intensity light was on (but had NOT been manually selected); error code was an expected E1. 

Once opened, there was no standing water in the dishwasher, but some dishes were still a little wet (Dishwasher had been set to run about 2am).  The unit would not power off at all, if the door was closed the pump would kick on.  The only way to fully shut it down was to turn the power off at the breaker box.

We could not find any water leakage or dampness along the door seal, nor was there any sign of leaks at the inlet valve.  The filters weren't super clean, but weren't clogged by any means. What we DID find was standing water in a little two-trough tray along the bottom right side of the unit, above which is a black rubber hose that hovers to empty just above it.  The "tray" sits just in front of Part M090 called out as "Switch Assembly, safety" in the Base Assembly Parts Diagram.  Right now we have the unit pulled out with a fan directed to dry up any moisture. 

Here's a link for pic of where the only sign of water is/was.  Is this a miniature overflow of sorts?  From the discoloration of the water and the film on the parts, it looks like this has been going on a while.

Thoughts and direction, please.  And thank you in advance for your time!

  URL to picture link:  https://imgur.com/a/ssdPE2h

[Ashton]

Dishwasher is working normal for a leak problem. The white round part in the picture has a round styrofoam disk inside  that floats and pushes a switch to turn on the drain pump. Turn off power at the circuit breaker box, sponge out the water. A shop vacuum that can suck water is best and quicker. Once all water is gone, the dishwasher will run normally until the water returns. Turn on power and run a wash cycle with the dishwasher pulled out. Look for the leak during this time. The dishwasher will start by running the drain pump, then fill with water, then the wash motor. After the wash motor has run for 5 minutes or so, you can cancel the wash and watch the drain pump for leaks. Repeat another wash cycle if you haven’t found the leak. Be aware there’s 120 voltage running the motors, careful poking your hands underneath the dishwasher.