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-   -   Propane furnace not starting, blowing cold air (https://www.askmehelpdesk.com/showthread.php?t=419598)

  • Nov 26, 2009, 02:38 PM
    sunshi9hm
    Propane furnace not starting, blowing cold air
    We have a Lennox Pulse Propane furnace that is currently not working. The propane tank was locked for three months this summer, but has been unlocked for a month or so and is 85% full. I turned the valve on the tank back on and followed the procedure on the furnace (it does not have a pilot light) which consisted of turning the electric switch to off and taking a door off the furnace and turning a knob to off and back to on and then switching the electric back on. When I turned the thermostat up it would try to start three times and then not again, and it only blows cold air. When it tries to start it will only try for a couple of seconds. We are thinking there is air in the gas line, so I have tried to bleed it by turning the electric switch off and then back on and turning the thermostat up. I have done this maybe 15 times over the past few weeks and always get the same result. Is there anything else I can try on my end before calling a professional out?
    Thanks for your time!
  • Nov 26, 2009, 02:44 PM
    Joshdta

    Is anything else in the house gas? You may need to take apart the gas line at the furnace to blead enough air.
  • Nov 26, 2009, 03:52 PM
    hvac1000
    Be very careful with bleeding Propane gas. It acts heavier than air and clings at floor level so it does not disipate easily like natural gas.
  • Dec 7, 2009, 03:09 PM
    sunshi9hm

    We do not have anything else gas in the house. I am not comfortable bleeding the line myself, if it comes to that I will have to call someone. I was told that flipping electric off then on and then turning the thermostat up and repeating that would eventually bleed the line. What I am wondering is, is that enough, or do I need to go through the whole shut off and on process for my furnace, which includes turning a dial to off, waiting five minutes and turning it back on.
    Thanks!
  • Dec 7, 2009, 04:24 PM
    mygirlsdad77

    You can just kill power and turn it back on again as many times as you like. It won't hurt anything. However, since you have a pulse furnace, and its on propane(double whammy), you will most likely have to call in a professional lennox tech that is very familiar with the pulse units.
  • Dec 16, 2011, 07:35 PM
    gunnyka
    I have propane a furnace and hot water heater. I just talked to my brother cause I am having problems with cold air and the hot water heater kicking out. It will blow heat but I have to shut off the heater then start it again and same with the hot water heater.. short story is he stated its not air in the lines as propane is under pressure (same thing my propane dealer told me)... but he did not tell me that it is probably the regulator on the tank. My brother stated that it probably got moisture in it and its not opening correctly to let the propane pass through... I will be calling them back on Monday to come change the regulator.

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