Washing machine PCB has a USART port. Do repairers use that? (lemmy.dbzer0.com)

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A washing machine is trapped in a fault state even though all the components function (AFAICT). The controller board has two ports:

ISP (to attach an ISP programmer to flash new software)
USART (4-pin serial port: 0v, TX, RX, 5v)

I’m guessing the ISP port is useless without whatever proprietary software is needed. But what can the USART do for me? Can that be used to obtain the error code and clear it, or reset the board to the factory state? Has anyone done that, without documentation?

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this post was submitted on 17 Feb 2025

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