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hello, ive run across that error as well and had the same thing , half the time the sump is gummed up ,take the spray arm off and sump cover off..clean that whole area with a soft brush..especially that little port around the heater ,about the 5- 6 o clock position...a little hole push a zap strap in there to clear it out ,i find its usually that
its usually that or the that clear sensor on the left ,but you changed that already ,its because its not sensing the water going in fast enough , did you push a strap or wire as far as it will go into that hole and clean it out ?..if those are ok it could be a plugged water valve screen
in the sump, there is a small hole ..not the hole that goes into the drain pump but a smaller hole that comes from the brake case assembly a small tube from there to the sump ..thats why you want to push something soft thru there to clear that hose and hole completely
YES , Very possible all the errors have main pcb as a secondary cause , to have all 3 is strange ..if you are getting water into the machine and its not overflowing or excessively hot then the main thing that joins all 3 is the main pcb ..that HE is a extreme temp error , if the water is 120-140 deg or lower then its not sensing the water temp correctly and bringing up that error , code book says its either a main pcb or thermistor..
seems to be , it looks like you thoroughly cleaned out the sump and brake case , so nothing blocked causing that ..good luck