Austin 2-20-25 Came out for a service call visit for a no heat as I arrived at the home to inspect the Armstrong 90% furnace I believe that it was just frozen up and having problems which would cause the high limit to shut off if it is frozen however, the system was running for way too little of time for the high limit to go off so I went ahead and bypassed it, and a few other things to see what was going on but after all my checking of the system, my determination of the issue was the gas valve on it had internally messed up. It keeps trying to shut off and back on even though the voltage for the gas valve open stays the same. The gas valves keeps intermittently messing up , which is why my diagnosis was the bad gas valve because everything else was still working how it should but the gas valve was not. I am going to get the gas valve and swap it out on the same day and get them up and running so they are good to go when they need their furnace. Got all the repairs completed and th