Heater not heating

We took the new 193 out this weekend and the temp got frosty cold outside - the first time since we purchased the 2022 Rpod 193 new this spring.  I opened the gas valve on the tank and then set the thermostat to "heat" in the RV.  The fan kicked on, then I heard several rapid ticks (furnace being lit?).  However, the heat never came on.  The fan kept running, but it just wasn't producing any heat.  

So, I tried lighting the stove top (no problem), firing up the fridge (all good), and I even lit up the bush kitchen flat top (cookin with gas) and let them all burn.  I then tried the furnace several more times.  After a a couple of attempts, the fan started sputtering on and off, the ticking turned into strange intermittent clanging - sounded like a woodpecker on an aluminum tree or a pneumatic ratchet - but it would only do it randomly and in spurts.  I stopped trying after several attempts and the fan stopped coming on.  I never smelled gas.