Report we got was fryer wont light, troubleshooting, checked my 24v I have power, changed out the control box, checked fuses, have gas, changed the gas valve .I have great spark. the unit never attempts to lite. Pitco tech service has tried walking me through some but nothing is working. I don't want to just keep throwing parts at this, any direction would be helpful. thanks.
I'm not one to ever just change parts out without doing a full test to determine what is the fault. You say you have spark and 24 volts to the Fenwall controller, but do you have voltage to the gas valve? The gas valve part number would be helpfull here. Are you certain that the gas valves are open? That a quick coupler if used is fully locked in. Check the gas valve coil with your ohm meter to make sure it is not open. Use a manometer to check that the manifold side gets gas. Make sure to also check the gas valve vent to be clear. The tube sometimes gets plugged with grease/dried oil.
Is the pilot lighting? Remember that with the Pitco matchless ignition you first have to have a pilot flame that the Fenwall can see a micro-amp current before it will open the main valve. Check that the valve is wired correctly. The 3 terminals are for PV-pilot, PM- common for both the pilot and main valve, and MV- main valve. They have to be correct to the Fenwall terminals. The pilot assmbly has 3 flames, a short center one to the electrode, and 2 long horns out to the burners.
Check that the high voltage wire and igniter electrode is not shorted or open. Power will travel the least resistance to ground. Conductive material on the electrode can be the least resistance path. Also ohm the ground wire from the burner to the Fenwall. That ground wire is critical from the pilot to the Fenwall for operation. And if the pilot flame is to low that it does not encompass the ignition electrode it will also also cause trips and lock out.
To work on these one must have access to a good DVOM with a milliamp function and a manometer. Hope I've given you enough information to find the problem. One other thing, It may not have a Fenwal, but a Honeywell burner control. They operate near the same, but have different timings.