It would be helpful if you answered/confirmed any questions that were asked. From what I understand, you never get any flame/heat during the ignition sequence and never smell any raw gas odor from the vent discharge...correct? Does the Fenwal ignition module show any fault codes?
Here is what I have done so far.Two things to check; 1. Is there another gas cock besides, the blue-handled one, somewhere in the gas line, and is it open? 2. When you open the union and have the blue handle in the position it is in in your picture, do you get gas? If not, why not? You'll hear and smell it very quickly. Natural gas is not poisonous but don't leave it open for long. It would be hard to get a 7.6"wc measurement with no gas coming from the line. You can also just pull that test plug with the gas cock open and should be able to hear and smell gas. If not, you have no gas to the appliance.
I have even seen older systems that have had water get into the gas line under ground and cause the condition you are seeing.
You say that there is no measurable voltage when the wires are attached.I remain stumped as to why the gas valve is getting voltage but not opening to release gas.
Wrong post. Whoops.Any other ideas for me? The gas valve is clearly getting voltage but does not activate the solenoid. This would seem to suggest a bad gas valve but I already replaced the gas valve with a brand new one. What are the chances I received a bad gas valve out of the box?
Is it possible the gas valve is not receiving enough amperage to activate the solenoid? I know the brown and yellow wires are providing 26.2 V AC to the gas valve as part of the ignition sequence.
I am at a loss and could use some guidance.