You might need to see what's happening with the gas valve in the machine.
It isn't mounted very solidly and if it has moved one of the wires may have come off.
The screws holding the casing are 'torx' type (they are in quite deep so would need a long torx type driver) and there are also two hidden where the side door pivots so the door needs to be popped off to get at them.
From what i remember the gas valve inlet also has a filter in it which may be blocked.
The bit circled near the on/off switch is the gas valve on a 180.
View attachment 18458
How do you open the casing at the bottle?
I have screwed up all the torx, but it's something holding it fast.