The furnace won't run with propane alone

My family and I have a small property outside of Sacramento in the little town of Rocklin.

Rocklin, California is about 20 miles away from Sacramento.

Rocklin is a nice place to live. Rocklin is smaller than Sacramento and it is a very short drive to work in Sacramento and live in Rocklin. Every morning I drive from Rocklin to Sacramento to work. I work for a commercial and residential furnace repair and installation business. We service all of the areas surrounding the city including the place where I live. This week I had to return to Rocklin as soon as I got to work. My first job that morning was a furnace repair. I drove all the way back to Rocklin to find the address. The address was a couple of miles away from my own home. The owner of the home called because the furnace was not running. There was plenty of propane to run the furnace, but there was no spark at all. I thought the problem was likely going to be the ignition switch or the flame sensor. I spent about 15 minutes troubleshooting the problem before I pinpointed the issue. It was in fact the ignition switch. I got a new one out of the truck and swapped it out. I flipped on the furnace and the machine started running. I told the homeowner that the furnace won’t run with propane alone. There are a couple of other parts to the furnace that need to be in good shape for the whole machine to work.

geothermal installation Rocklin CA