I'm trying to test the heater in 2001 SM. Turning on the switch at thermostat and when turning up the thermostat the fan clicks on but no heat. Does this valve need to be opened at the propane tank? Odd to me that there is the word "Vapor" under the valve and I'm nervous about what it's for
Here is a photo of the propane tank with the valve circled in red.
As stated before thatís the propane shut off valve. It needs to be turned on. Also as stated before it may take awhile to light after the valve is on. Normal devices run off propane vapor not liquid. I believe vehicles, forklifts etc run off liquid propane thatís why itís labeled that way.