Dishwasher repair

I'd base my decision on the age and condition of the machine. I'd consider replacing the machine if it is over 6 years old.

that is a lucky find for the OP :-)

To the OP, watch out for "Customs charges" as well as the postage and packing, which can easily all add up to double the listed part price :-(

That shows the blown chip as a ULN2803:

Theo

I'd also check the coil protection diodes in case they have gone O/C as they are critical for preventing back EMFs.

I'd also examine the old relay to see if its the coil that burnt out or whether the contacts burnt out and possibly arced across to the coil sending mains voltage back to the IC controlling the 6V coil.

Either event coudl cause a hole to be blown in the IC.

misterroy expressed precisely :

It doesn't look like the same part!

In future, could you reduce the file size of your pictures from 37.5MB to 100KB? I have to wait while the picture downloads line by line.

Where did you get 37.5MB from? The files I linked to are 783kb and 1.2MB.

Indeed, but drop box is incapable of serving them with any speed

On the burnt relay, in circuit the coil measures approx 2k, the datasheet quotes 100R so it's safe to say it has gone O/C. The contacts are 'stuck' in the energised state too, but given the state of the relay body this is no surprise. There are two more relays of the same type on the board, these both show the expected coil resistance. I have also checked the contacts on one of the other relays, in the N/C position they measure around 30R, tapping the relay changes the resistance - not ideal!

The datasheet for the ULN2803 shows it has internal protection diodes for driving relays, so a failure there could certainly kill the driver chip.

Senior Domestic Management (aka SWMBO) favours just buying a new dishwasher. As this one is 10 years old, that might be the best solution for a quiet life!

So it seems.... Uploading the files was much faster than downloading them to check the sizes hadn't changed! Shame Tinypic no longer operates as that seemed better.

Check the underside of the board for solder tracks, that may have caused a short circuit.