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FIXED GDF510PSD1SS GE Dishwasher No heat


Premium Member
Apr 29, 2023
Model Number
6-10 years
Ten year old GE recently stopped getting hot. At end of cycle dishes all warm but still wet. Evidently heating element not coming on. Order new element and Flood switch. Tested old flood switch and got no continuity so replace. Element measure 16ohms resistance so assumed good. Visual inspection of element shows couple discoloration areas but no burnt or bubbling spots. So focused on TCO. See picture. Cannot tell if tripped. Red end means what? No way to test continuity as wires do not pull off. If needed any idea where to order just this breaker? Thanks...


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Looks like these forum folks take Saturdays off leaving us DIY guys to fend :) I shall just have to be patient with my torn apart kitchen...
I did see this in the service manual: https://drive.google.com/open?id=140Kbh3jsVCcr-y2MU82JBgMhWdCrKgky

Page 16 shows you the Tub TCO. Page 94 and Page 95 explains about the heating system and has a flowchart to help you.

Tub TCO:
•Location is bottom of tub, right side approx. 12 inches from front
•120 VAC, 210f +/- 10 Manual Reset
•If the TCO trips – reset and replace the main control.

Screenshot 2023-04-29 17.33.28.png

Here's the Tub TCO for your model, that comes with the wiring harness that comes with the drain pump kit:
WD49X23779 P1BWASH Pump Kit

Here's the main control board for your model:
WD21X22278 Kit Main Board

Let us know what you find.
All fixed here... Tested the TCO for continuity and all good. Had to make small slice in insulation to get probes in. Still I was baffled by the red tip. Thought it was tripped but evidently not. Ran another test and all worked. Evidently my first repair where I replaced the flood switch did the trick but I did not run the test cycle long enough. After playing with the TCO decided to test again and let cycle run all way to end. Elemeent came on for the drying stage. So all happy here... Thanks for your help...
Excellent, glad to hear that.(y)

Thanks for the update!

Here's the flood switch for your model, in case others need it too:
WD21X10519 Switch Flood Asm

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