Hello, I have a Frigidaire (Nordyne) Upflow Furnace Model # FG6RC 080C-16B where the LED is flashing 4 times. The fault code indicates "Ignition Failure (check ground). I have powered down the unit and restarted it a few times. I hear the relays engaging, and the blower comes on. When looking into the burner viewport, I do not see the ignition glow. I confirmed the pressure switch is working. I also unplugged many but not all of the connectors\plugs on the board to de-energize it. I'm not sure what to check next. Could someone please provide some additional test steps or point out potental components to look at? Thank you in advance for the help! David [ATTACH]74428[/ATTACH]

Bryant 80 furnace won't fire. The inducer fan runs, the igniter gets red hot, the gas valve relay engages for about 1 second. As soon as the gas valve relay opens the ignitor goes out. No smell of gas. I measured the voltage to the gas valve, ~25 volts for about 1 second. With the gas valve solenoid disconnected or the switch on the gas valve in the off position I measure 26 volts going to the gas valve for 5 seconds, the ignitor stays red the entire 5 seconds and doesn't go out until the gas valve relay opens. With the gas valve connected and switched on the valve solenoid draws about 220mA measured with a Fluke 88 in series, but only for about 1 second. I can hear the GVR energize and de-energize. I measured the secondary of the transformer with no heat call the voltage is 26.2VAC, when the Gas Valve is energized the voltage only dips down to about 25.5VAC. I can feel the solenoid on the gas valve engaging. It's as if the GVR can't provide enough current to keep the gas valve solenoid energized. That would make sense if it was an SCR or a solid state relay but it appears to be a elctro-mechanical relay. The air pressure switch is made when inducer fan is running, measured 24VAC to ground on both sides. The high limit switch is made, measured 24VAC to ground on both sides. Ground wire from the gas valve is connected to chassis ground. Any ideas what I'm missing?