I replaced the cooktop control Inverter Module right side and the oven control the PCB inside control box.
E84 is almost always caused by the induction module. The whole assembly should be replaced (left and right side). Unfortunately this is an expensive repair. A Communication error between the main and display control boards is often sited as the cause but I have yet to see that be the case.
This is normally a comms error to the display board.
Testimonial: "How do you repair this issue?"
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