Along with my remote leveling parking transmitter (
https://www.airforums.com/forums/f38...ks-240057.html), here's a cheap replacement for a fridge controller. Like, have you looked at the replacement cost ($300+) for one?
This controller uses a 100K NTP resistor to monitor the flue temperature, an $11 sparker, a small $3 variable DC-DC buck converter, and an Arduino Pro-mini to turn on the propane valve and provide ignition. All the usual monitoring safety features are included, making sure the propane is turned off if the fire goes out.