Hi Everyone. I have a Raypak heater that is not igniting when calling for heat. I can hear the spark, but no flame afterward. My best guess is the pilot orifice is dirty, or there is air stuck in the propane line. The worst part is the display is wrecked so I can't see if there are any error codes displayed. I'm reaching out for help because I am not very familiar with Raypak heaters. Where should I start, and what things should I be checking? Looking forward to hearing from everyone. TIA