The tank valve has a checking feature which will kick in if there is too much propane flowing at start up time. This is a safety feature built into the valve. Basically you just need to slightly open the gas tank valve. In addition, make sure that when you start up the appliance that you just open up the gas flow on the appliance very slightly before igniting it, and if applicable to only light up one burner at a time. Then after the appliance has lit up, you can turn the gas valve all the way up.