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WDTA50SAHB0 Whirlpool Dishwasher - Thumping in middle of wash cycle and occasional leaks (related?)

crate master

Premium Member
Joined
Oct 8, 2022
Messages
4
Location
Canada
Model Number
WDTA50SAHB0
Brand
Whirlpool
Age
1-5 years
A while ago my dishwasher leaked and the water got down into a hole in the floor and through the basement ceiling. I didn't find out exactly where it was leaking from because I needed to drain the dishwasher and shut off the water ASAP to prevent further damage. It didn't leak on the next load so I got a couple of those cheap leak alarms, put them under the dishwasher and hoped I had just used too much powder cascade that one time. A few months later it leaked again. A few months after that it leaked a third time but this time I saw that water was running down the float switch housing and onto the junction box! (red circle is where it was dripping from)
1 leak.jpg

Things i've tried:
Checked both spray arms for cracks. They both look fine
Removed the sump cover. It looks fine though the seal looks bent in one place
2 sump cover.jpg
Checked water level midcycle
3 water level.jpg
Checked the float switch gasket. It's intact though by the indentation it looks like it wasn't centered
4 switch gasket.jpg
The plastic nut covering the gasket/switch was tight enough that i needed a wrench

3-5 weeks after the first leak, the dishwasher started thumping. Usually it starts around when the rinse cycle starts

It hasn't always been consistent but it happens pretty much every time now. I'm always very careful not to have dishes sticking out the racks. I've tried running it with no dishes and with the bottom rack removed and found that there's never any thumping without the bottom rack or with an empty bottom rack. I guess that, if the thumping is from the lower spray arm, the plates stick out just slightly below the rack which might be enough to make contact. I've also tried flushing the lower arm with the garden hose and like I mentioned earlier, both arms seem to be without cracks.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
135,725
Location
Vicksburg Junction, Arizona
I can't see your video, please repost it, or you can upload the video to Youtube and post the Youtube link here. Or share your video per Google Drive, Dropbox, or Microsoft OneDrive and post the share link here.

Jake
 

crate master

Premium Member
Joined
Oct 8, 2022
Messages
4
Location
Canada
Just to be clear, I meant to upload it as an mp3 of the thumping sound. no video.

Also, when the thumping starts midway through the wash it keeps going until the rinse ends. I can hear the difference between the two diverter states and the thumping only happens during one and stops for the other. I figure it's a good bet that a new lower spray arm would fix the thumping at least and maybe the leak as well but is there anything I should try before putting down $100 for it?
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
135,725
Location
Vicksburg Junction, Arizona
Ok, got it!

Are you absolutely positive its still not oversudsing?

It does sound like possibly the lower spray arm is making that thumping sound, and possibly the leak too.

Look here:

Your model uses the exact lower spray arm:
Spray Arm W10837249


RepairClinic ships to Canada: https://www.repairclinic.com/PartDetail/Lower-Wash-Arm/W10837249/4363314

Also make sure the lock ring that holds the lower spray arm in place is tight.

You can see it in this video:


Jake
 

crate master

Premium Member
Joined
Oct 8, 2022
Messages
4
Location
Canada
Are you absolutely positive its still not oversudsing?
It's possible oversudsing caused the first leak but I was careful not to put too much cascade powder afterward so I don't know how to explain the second one. By the third leak I was using detergent pods.

What makes this frustrating is 99% of the time there's no leak so I can try this or replace that part, but I won't know if it actually fixed it until it leaks again in who knows how much time. And it was leaking directly on the junction box which seems really dangerous. I guess the best thing I can do is get a new lower spray arm and keep the service panel removed with a couple of towels above the junction box with the leak alarm sitting on top and hopefully it'll go off before the towels get soaked enough to start dripping. Would this be a bad idea?
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
135,725
Location
Vicksburg Junction, Arizona
I guess the best thing I can do is get a new lower spray arm and keep the service panel removed with a couple of towels above the junction box with the leak alarm sitting on top and hopefully it'll go off before the towels get soaked enough to start dripping. Would this be a bad idea?
That would be a good idea.:)

Jake
 
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