Are you running both furnace and fridge on propane? After you opened the valve to a full propane tank, did you flush the air out of the lines via the burners on the range before you tried to light the furnace and turn on the fridge?
If you did not, my guess is that you have yet to get propane to either. I don't have your rig, but I do know that if I fail to get the stove burners lit before turning on the fridge, I get an E1 error. I also get the furnace failing to light, ditto the hot water heater. Each will try to light the burner three times, then give up and go into error-code shut down.