On Thursday, November 20, 2014 8:46:04 AM UTC-6, Andy wrote:

I am sure that the regulator is bad.
They are less than $20.

Old one is 4 years old +.

I saw warranties on regulators of only a year.
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Thanks,
Andy

I've had the same difficulty about 4 times...
How to reset the gas regulator safety device:

Open the grill lid.
Turn off all knobs on the control panel in front.
Turn off the tank knob. ...
Wait 30 seconds. ...
Slowly open the LP tank knob all the way open. ...
Turn on the appropriate control knob and light the grill per the instructions on the control panel.