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Hello my name is ***** ***** will be my pleasure to assist you. The voltage is okay on both but the problem is the coil is open on the bad valve. It is an electro magnet that opens the valve when voltage is applied. But if the coil is open then there will be no magnetic current to the valve so the valve will not open. The voltage is low from what I can tell. You would need to check the transformer to see if the transformer is putting out 24 volts to the furnace. If you go from the R terminal to the C terminal of the circuit board you should have 24 volts.
if the furnace is only 5 months old the gas valve should be under warranty. I would get a hold of the installer and have them change it under warranty.
The voltage will go up and down at the gas valve thus creating the modulation or increase and decrease in gas to the burners because it is a modulating furnace the control board is what controls the voltage out to the valve increasing and decrease the voltage opens and closes the gas valve
Yes the voltage is correct. As I said in my earlier post the 13 volts will fluctuate to modulate the valve more voltage the more gas flow and thus more btu's the lower the voltage the lower the gas flow and lower btu's. The gas valve is definitely the issue.
you are very welcome!