Today the factory replacement gas valve was picked up and brought on-site. The valve was replaced and the unit heater operation was checked. The gas pressure on both the inlet and outlet side of the valve is in proper range. After the new valve was installed the unit was cycled several times to confirm that it goes into and out of it’s ignition sequence properly. Thank you, Jon Tech notes: Lennox LF24-400A-5//5617D01979