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Hi my name is Robert.....
IF you have a LP detector make sure it is turned on, some set ups if the detector trips it cuts the flow of LP. Go to that main tank valve and shut it, SLOWLY open it back up, sometimes if the main valve is opened to fast then the regulator can lock up, slowly open it up. Sometimes you will find a main valve on the hard pipe where it comes into the RV, under the sink stove etc, normally they will have a red handle. I think the next step would be to have a shop hook up a manometer and do a system pressure check and a leak down check to see if you are losing the LP, normally if you had a leak you would smell the additive so check all the lower cabinets and see if you smell that, LP will sink to the ground and become stagnate. The other possibility is if you had contamination in the LP.... Hope this helps some... Robert
IF you have more questions or concerns please feel free to contact me... Robert