………the furnace has been making a noise while running then blowing cold air….
===I am speculating that this noise has something to do with the issue of the breaker tripping. Does not, however, explain why none of the propane appliances are working.
Pardon me for asking, but are you absolutely sure the propane tanks are not empty? The odds of all propane appliances failing at the same time I would think are pretty remote. As mentioned before, I had the same problem years ago getting flow through the regulated/tank valve.
Does your water heater have electric ignition or do you have to manually light the pilot? On our fridg, if it fails to light on propane after about a minute of trying, it locks out until you turn it off and back on again, then it will try another cycle. When a propane line gets air in it, it sometimes takes quite awhile to get the air through the tiny pilot orfice.
By all means, keep us posted on what you find. It's really got our interest (at least mine) as to what is going on.
Randy, Karen & Abby (Pom-a-Poo)
2014 Eagle HT 27.5RLTS
2015 F250 Super duty 6.2L full trailering pkg.
Shenandoah Valley of Virginia