My Gas furnace hot surface ignition glows red but the gas does not click in? :confused:

I have a Lennox 4 wire system furnace and I purchased a Noma thermostat. I currently have White,Green,Blue and Red wires. Based on the advise I got online so far, I've bridged the Red and White wires and I'm getting the heat. This is just to test and make sure that the furnace is OK. I still needs...

The repair tech says my Lennox Pulse gas furnace is fine and that the thermostat is fine also. However, even when it says it is 75 in my house, I am still cold. When it is 75 at work, I'm "toasty". The technician did say replacing the "U" coil may help (he didn't look at it yet), but it is...

Please help My furnace is not working and I know very little about it.. I was told it does not have pilot but has an ignitor... I turned it on yesterday but it didn't come on.. There is a glass mirror on the door that has a red light in it.. The red light brinks rapidly so I know it has power...