Hello from Dan.
the DSI starts a pilot light, then when it senses the heat from the pilot light, it turns on propane to the main flame unit.
It is common for the 2 thermal sensors connections to become a little oxidized and not flow electrical current letting it turn on the propane.
Usually sliding the connections on and of a couple of time will clean them up enough and could correct the problem. the 2 sensors are the max temp sensor and the over temp sensor.. the 12V goes in one, over to 2 then to the valve. make sure you have 12V at the valve. if not, chase it back through the sensors and the source. ( control box ? ) simple and could save you replacing a bunch of costly parts.. ;-)
Hope this helps.
Dan Asbjornsen and Patty Chatman
back to Diesel pusher.
2007.5 Monaco LaPalma 34PDD 5.9L