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It may just need some time to charge the system and come up to pressure OR the regulator may be bad or needing some adjustment. Light up the stove top burner first and then try it again. Maybe 4 or 5 times. Turn it off and then back on again. Let me know what happens and we can go from there. No unusual when it sits for any length of time. All follow ups are included in our fee.
Hopefully, you got this resolved as I didn't hear back from you. You can always return to this posting again if you Bookmark it and we can do a follow up. All part of our service and please take time to enter a rating as that is the only way I get credit for my time spent helping you. Thanks! Be safe........