Posted: 1/27/2005 5:09:09 AM EDT
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Howdy. It's about 48 degrees in my house. My propane furnace seems to have a problem with the burners. The draft motor kicks in, the three burners ignite, and after about 2 minutes the flame jumps back to the propane supply rail. The burner flame grows visibly smaller about 30 seconds prior to the flame jump. This first happened overnight sometime, I woke up, the furnace blower was running but the air temp inside was about 40 degrees. I shut the furnace off for a short time, restarted it, the third burner did not want to light on its own, I lit that with a propane torch, and the furnace raised the interior temperature about 10 degrees over a half hour (normal for my large drafty house). Now the burners are having the flame jump problem. It is about -5F here and I am wondering if a regulator or something is freezing up with the extended amount of run time and not supplying the correct amount of propane. If anyone has any suggestions I would appreciate them, otherwise I call the HVAC guy. Thanks! J Edit - If it helps, I have a down draft Amana furnace. The first burner now seems to be the only one experiencing the flame moving into the nozzle body. Edit again - The temperature is now 56 and climbing, the flame jump problem seems to have disappeared. I just got off the phone with a service tech, described the problem, and his response was "If the burners or heat exchanger are rusty, they need to be replaced. Other problems could be the lack of screws in the nozzle, or low or improper tank pressure." There is no visible rust near the furnace except for two support brackets that hold the burner assembly in place. The screws are in place. The propane tank was filled yesterday. 
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