Originally posted by Karyn
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I just reread your initial post. I'm fairly sure that the double shot light being on solid and the machine not operating is the board not receiving a response from the brew thermoblock thermistor in a preset amount of time. This is a very rare fault, I can only remember seeing it once before and it was a circuit board problem then, not a thermistor. They are very reliable.
Given the array of other problems you have, I would definitely suspect the board.
The boards themselves are covered in a conformal coating that will protect most of the circuitry from water damage. This also means the likelihood of it being a dirty contact or corroded wire very slim. I don't recall any situation where a component or wire has had water damage.
I also noticed you posted previously that you had a leak from the hot water tap and poor steam performance. The water tap leak is from the needle valve. It's reasonably cheap to replace. The poor steam can be a time consuming task.
Most likely the steam thermoblock has scale in it causing it to not operate efficiently. It can be descaled and usually comes back ok. Sometimes they just don't recover very well.
It's also possible the steam pump could not be working properly..
I'd definitely take it to a service centre for appraisal at this point.

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