Just Purchased 2006 Rage'N M-2600 FS Have Questions

We are aware of the battery disconnect & both propane tanks were filled just the week before, fan was blowing just not hot.... but we use it every weekend so we need the heat. Luckily we were camping close to home so I just had my 16 yr old bring me our elec heater. Closest Rv dealer is 30 miles away and I hate to take it just to have them charge me 160.00 dollars to flip a switch or something that we may be over looking...