raypak heater

We bought our house 17 years ago with a cedar hot tub heated by a Raypak RP2100 pool and spa heater on propane. Although the LCD display is broken, it has functioned well as long as we've been here. We heat on demand, so it takes about a half hour to bring it up to temperature if we've used it...

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...

Recently installed an Avia raypak heater and it works for a few minutes but after 5 minutes or so i gat a “ high flow fault” is this because there is too much flow and should i consider plumbing a bypass or is it related to another issue?