[WeBeFulltime]

Originally Posted by jcurtis934

The ignition sequence has the light come on, then electronics checks for blower on moving the sail switch internal to the chamber, then gas valve will get 12vdc, and there will be three tries to produce a flame. If none, then it goes into lockout where you have to turn the switch off, then back on for another cycle. If you opened the tank valve too quick it will engage a safety in the tank hose line to the regulator and not enough gas makes it to the water heater. In this case, turn off propane, take hose off tank, put back on, open valve very slowly, and then try another cycle. If you are outside after turning the switch on, you will hear the three attempts to light. It will do this until the air is out of the line.

The OPs problem is with the water heater not the furnace.