Truma Combi no gas supply

[popadib]

Hello, I have just purchased a 2019 Coachmen Crossfit 22CEB
I have figured out the control panel, but the heat never comes on. It throws an error E112 & E212 which is basically telling me the gas supply is closed. The previous owner had the van winterized professionally and thinks that the propane may have been shut off. He is not mechanical and usually had everything performed by the RV shop.
I looked under the van and see the propane tank, but no type of knob to turn on the gas.
1) In the manual it shows an ON/OFF switch. Where is the Combi Furnace located? I can't find it.
UPDATE: I found the Truma furnace and it was switched off. I switched it on but still got the code for no gas supply.
2) Bottom line, how to I turn the propane on?

Any help would be greatly appreciated.

 

[Neemer]

Figure out how the propane tank is filled, and you’ll likely find the valve to turn it on/off.

 

[Kevin D Pem]

Do you have a stove? Does it work?

If all other devices work, then take the lid off and check the fuse on the truma main circuit board.

That board if bad will cost you several hundred dollars, and can only be ordered by a dealer. It can only be installed by a dealer. Then pull out your wallet, because the price, and install is 3/4 of a grand.

I am working on rebuilding such a board for a friend at parts level, but have not completed the task yet.