Hello, Long time reader, first time poster. :) My Fasco Furnace Draft Inducer Blower has become noisy (rattling, rattle, clicking sound). After installing a Nest thermostat with no common wire 4 days ago the noisiness starting developing. The first day the noise was intermittent but by day 2-3 it was constant. I went back and found that I had a common wire hidden in the wall and connected it to the Nest thermostat so it could have its own dedicated power (but that did not help). I switched the thermostat back to the older Honeywell that had no previous issues with the noisiness but that didn't help (the noise was still constant with the Honeywell too). Not sure if the Nest thermostat caused the issue but its too late to go back to the way things were since my furnace has stopped working properly. Here is a video of my furnace and noisiness: [URL="https://www.youtube.com/watch?v=OeuQu8ErSdIhttp://"]YouTube Link[/URL] *Please excuse the shaky video Today I turned the furnace on with the noisiness and it started the flame up normally but shut the flames off after four minutes and kept running without heating the air. The next time I tried the furnace, the flames would not ignite (is the system preventing ignition because of the inducer?). I have shut off the furnace until it is repaired. Does anyone know if the inducer is the problem or if something is causing the inducer to make that noise? P.S. there is a red light flashing below, not sure if that's normal or if it's an indication that something is wrong.

I have a tappan gas furnace -model L1ra 090c 16b. Nordyne control board 624631a The problem started with no heat. Status led (red) blinking 4x. The ignitor would glow, but no gas flow. An hvac tech friend came over and we did the following; 1 check all roll out and limit switches with multi meter=all good 2 check voltage at gas valve =24v when ignitor comes on 3 check resistance of valve (across both terminals) = OL/open. Also open from each terminal to the valve body. 4 replace gas valve=ignitor glows, but no 24v to gas valve so no flow. But now I have constant 15v at gas valve 5 checked flame sensor, cleaned with scotch brite= ignitor glows, voltage increases from 15 to 24v and furnace lights and runs as normal shuts down as normal under thermostat control. 6 check and adjust gas valve output with manometer= when t stat shuts furnace down, out put is zero verifying that the valve is indeed closing. This brings me to my main concern- is this constant 15v at the gas valve normal? If not, than most likely the control board has a bad relay and probably killed the original control valve? Thanks for any input.