furnace keeps igniting forever !!
My house is single dwelling , 2 stories. The upstair gas furnace is Bryant-day-and-night , model 394J . Some weeks ago , I noticed the clicking sound kept coming out from the furnace. Looking into the burner , I saw the pilot was on , but the ignitor kept arcing over and over. I reset the Tsat , then set the thermostat to overdrive mode , it appeared the furnace worked normally : ignitor on , next the pilot , then the burner flame up , and then blower on , but after about 30 seconds , the burner turned off , the blower stopped after that about 10 seconds , only pilot and ignitor stayed on forever. It also worked that way in other mode: hold , program...I already tried with new control board , new Tsat , to no hope. I turned off downstair furnace , guessing maybe not enough gas pressure for the upstair to run , but same thing happened. Please help . I include the furnace picture , if any more needed , please advise. Thanks for your time.