Originally Posted by uniquemicro
... I am in the process of inspecting a new to me [not made yesterday] Argosy 22 and find that the furnace will not light. The furnace ... appears to have a piezo lighting mechanism (instead of pilot light). ... Any suggestions?
Welcome to the forum.
You've got a potential death trap there.
Read enough threads here, and you will find that, if your furnace was not made yesterday, then certain doom is surely in your future. Save yourself - Stop troubleshooting & replace the furnace.
That being said, I fired up my Airstream's original furnace last week for the first time this season last week, and my electronic CO sniffer gave it a "thumbs-up".
I think you are not being patient enough in trying to light it. Look again - The presence of a piezo-electric mechanism means there is a pilot light
to be lit. There will be a thermocouple somewhere close-by that needs to be warmed to tell the furnace a pilot has been lit.
In my Overlander, if the gas bottles have been off for a while & I want to run the furnace, I use a propane torch (MAPP gas) to light the pilot. It can take a while, sometimes, for the propane gas to get to the furnace if the only drain is the small amount required by a pilot light.