I own a 2013 Hawk with the typical 2 propane tank configuration. Last week we emptied tank #1 & switched to #2 but we're unable to light our stove. Also unable to light the propane heater. We re-filled tank #1 but weren't able to get that going either. Could it be a bad regulator?? The tech who filled our tank advised to open the tank slowly -- which we did. Thanks for your help...