Repair question

hey all, my grill stopped working today. The pipes are still clear because I turned on the gas and turned the dials and could still smell gas, so it all seems to lead to the ignition, which doesn't click. I tried to change the battery, no but luck there, either. It may have died because I THINK it got wet after a bad rain storm and my cover ripped, exposing it to the elements?) and I'm looking into a replacement part but don't know what the numbers mean on the side.

on my part, it says DHLG 12, 20-50, but the closest I can find on amazon is 20-40. what do they mean? Are these compatible? thanks for any help you can offer.