2007 rockwood 2602 water heater

I am dewinterizing the trailer for trip in coming weeks, and my water heater won't light. I open propane tank and flip switch on water heater out side then flip switch inside and it sparks but doesn't light.. used many times last year no problems at all. I have misplaced guide, personally my wife moved it when organizing but I did it Lol.. "Yes dear" so now I need help..I checked outdoor bbq it has propane running tothat.. the inside reset light had always turned on for 30 seconds or so until lit then would shut off until warmed up, well that's what I noticed. But the rest light shuts off for sparking but won't light so light stays on. Shut everything off and started
over again still nothing..


I noticed there's a push to reset thing on waterheater but either I'm missing something or mines broken because I push on it and doesn't move??



Please help really stumping me!

Thank you happy camping season!