bleschke

I Called the company and they thought it might be a ground problem. I had a new power supply ran to my furnace, a new board, a new flame sensor, and have spent over $600 and I still have the problem. What now???

I also have a Conquest 90 furnace. I have had it about 4 years. For the last 6 weeks, I have been having trouble with the burner staying on. I have had heating technicians working on this and they are stumped. Here is what happens. The ignitor comes on, then the burner ignites, ignitor goes out, burner goes out. Ignitor comes on again, burner lights and then stays on, sometimes. Sometimes the furnace locks out and then I have to reset it by shutting the power off, back on. By talking to the technicians., they explained that if the flames sensor fails to sense a flame three times, it locks out. They also said after on hour it should reset itself which it did today, as I was home to analyse what was actually happening. They have replaced the flame sensor and put a new board it. No help. The code on the board when it is locked out, is one flash, wait a few seconds then one flash. Any insight to this problem. They are going to replace the flames sensor again, thinking they got a bad one from the supplier. I hate to have to buy a new furnace.