The piezo is not sparking on our old fridge so can not use it on gas. We may need to fit a new piezo but the problem is the model number has rubbed off the fridge! It's an Electrolux Siegen gmbh type c40/110 fitted in a Hobby 750 1999 model made in Germany. Has anyone any idea how I can find the part number? Also if anyone has any other ideas why it is not sparking I would be grateful. There doesn't seem to be any power getting through to the switch.