Not sure if a gas fuse is going to cause any issues, a standard Aussie regulator is all you need. Remove the fuse and use a standard regulator, to reset the regulator, turn the gas off, try to start the pizza oven and hold the button in (it won't light as the gas is off). Turn the pizza oven off, turn the gas on the cylinder on very slowly until fully on. Hold the pizza oven knob in and keep twisting until it lights (you should hear it sparking), when it has lit hold the black knob in for 10 seconds before releasing.

Is it possible that the knob has become loose on the spindle or the flame detector has been moved therefore no gas

I think you could be right with that one

I see no reason that you can't just use one of those small metal boxes for wood chips/pellets sold in Bunnings, BBQ's Galore eye.

yes, I use a little stainless steel ventilated box, I soak wood chips for a few hours, sometimes I use rosemary

No sorry

Hi It could be your gas bottle not getting enough gas into the oven Thats the only thing i can think of sorry i hope this helps

Check that the door is not bowed thereby not giving a good seal

Thanks for your suggestions.