I have done that and it shows zero, but that was after it had run. I'll check in the morning. Normally it shows 8 which is good. You did give me an idea though. I may shut the gas off, try to run it to purge the propane, and with a propane torch to the igniter, see if I hear a click (or 2 from the gas valve).I wonder if you can turn the gas off, try firing heater and check the flame strength. It should be 0 but if sensing flame through the igniter when there isn’t a flame it could possibly a board issue.