Maybe different on newer models(like yours) but I did about the same thing (leave heater on) but didn't recognize it till next time up to campground, which was about a month later. Heard a little clicking noise of heater trying to start. Changed to full propane bottle it heater took right off and no problems.
This also might help if you leave RV unattended for length of time.
Think hard about leaving propane bottles in on or off position. We thought off was better choice. That was until our elec went out and circuit breaker flipped off and was surprised to find frig/freezer was full rotten food. After spending most of day cleaning it out we decided to leave propane on. When the frig/freezer flipped to propane it could of went as long as batteries could go. But with propane off, frig/freezer didn't have any gas. Just FYI
We still have 1 lot there, sometimes we call it a "campground" other times a "labor camp".
2003 Majestic 23P... Northwest travel machine
2013 Arctic Fox 25W... Wife "doll house" for longer snowbird trips
2001 "The Mighty Dodge"... tow vehicle for "doll house"