First off you need to test and verify gas pressure before blaming the heater. Also check the pressure switch. This heater has no Thermocouple. If it lights them the ignitor is ok. You need to find out why the 24 volts is being shut off to the gas valve
Awesome, let me give that try. This unit is 9 yrs old. Has never given me probs. Will focus my efforts there and let you know how I make out. Worse case, replace the pressure switch. It's easy and only 65 beans retail.
Guess what? It was the pressure switch. $51 part. Easy to replace. Just replaced old w/ new and the burners fired up.
THANKS!!!