
Returning to the kitchen a few minutes before it was due to finish, I realised that the pressure valve had never popped up! So it hadn't been pressure cooking at all, just boiling the stuff

So I took the lid off and played with the valve, which seemed fine, and put the lid back on and stood there waiting while it heated up again. Except the boiling had reduced the liquid too much, so it started sticking to the base of the pan which triggered the sensor that stops it if that happens, so it doesn't burn

And so I added more water, and stirred and scraped until all the stuck stuff was off the bottom, and now it's finally heated back up and come up to pressure, and dinner will be about an hour late

At least I now know that it doesn't actually use a pressure sensor. Apparently, it starts the countdown based on the temperature it's got to and (I think) how long it's been at it for, as that should normally correlate with it having reached the pressure that forces the valve shut

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