Checked Pit Gas Fryer unit gas pressure 9.5 max. noticed runner tube for burner clean out not lighting. tested gas pressure at orifice 0 tested supplied to valve had 9.5. valve had 24v to it but not opening. turned pilot flame up. unit came to 353 set to 353. all burners lit. noticed burner flames sometimes slow opening like 1/2 pressure then next time will open all the way intermittently. unit is at 353 degrees. and I never saw error. unit operational ? but requires parts. 3-26-21 Turned gas off and removed combo valve and small burner cleaning valve. replaced both valves turned gas on tested for leaks, none present. turned unit on, once air bled out pilot came on and went thru burner clean cycle. then main burners came on and heated to set point 360 and cycled off. watched cycle several times and valve was opening and closing fast and definite. unit is operational job complete.