Originally Posted by UmptySquat
Thanks for the idea Mark. I tried that with no luck. The light comes on immediately when I turn it on.
2013 Toyota Tundra 5.7L
2015 Apex 288BHS
The DSI light usually does come on (it has on two RV's with Suburbans I've owned) until the propane ignites. It only stays on if the propane fails to ignite. Are you giving the DSI enough time to ignite the propane and then seeing if the light goes off........ or is the propane failing to ignite? It's usually a 15 second purge from when you initially turn on the DSI switch, until the first cycle of attempting to ignite the propane.
If the propane fails to ignite after the first attempt, there is usually two more delays and attempts before the propane goes into "lockout mode"......and the DSI fault light stays on continuously to let you know. You have to turn the DSI switch completely off and on again to reset the lockout.
However, if getting to the lockout part, then you may have a problem on propane delivery or ignitor problems, or even a clogged flue with spider webs (very common)
On another note, if you already have the electric heating element on, and it's heated the water...then turning on the propane/DSI switch will not get you anywhere as the thermostat isn't going to allow the burner to ignite since it doesn't need to.