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  1. #1
    Join Date
    Sep 2002
    Location
    Central City, Ky
    Posts
    59

    First Lenox Pulse 21 Gas Furnace

    I just got back from a service call on a Lenox Pulse 21 Gas Furnace (Model G 21Q4/5-10 0-1) This is the first one I have ever seen. Of course, there are not papers for the unit..rental property. I noticed the control module was flashing green so I reset the power and the led changed to solid green. It failed to light and flased again. I checked the inducer (runs) and the pressure switch is closing. I haven't checkd the sparker (looks like a spark plug) or power to the gas valve. I will return in the morning hopefully with a little more information about this unit. I did not see anything about the led code.. steady flashing means??? (probably ignition failure).. any suggestion would be apprciated.. thanks

  2. #2
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,337
    Did it even cough, when you reset it? Most common issue with furnace is air flapper material. But there are many other things you need to check.

    G21 service-
    Pulse 21.pdf

  3. #3
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,038
    the pressure switch on a lenox pulse is normally closed and then it proves opened. silly i know

  4. #4
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,038
    also fyi gass pressure for a pulse is 2'' W.C

  5. #5
    Join Date
    Jan 2007
    Location
    in my lumpy chair
    Posts
    1,950
    Haven't seen one of those for a while, still have the flappers though
    I dont warranty Tinkeritus

  6. #6
    Join Date
    Sep 2002
    Location
    Central City, Ky
    Posts
    59
    It did not do anything. No cough... However, I don't hear as well as I use to.. All I could hear was the module clicking..

  7. #7
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,337
    Quote Originally Posted by Core_d View Post
    the pressure switch on a lenox pulse is normally closed and then it proves opened. silly i know
    You sure about that?

  8. #8
    Join Date
    Sep 2002
    Location
    Central City, Ky
    Posts
    59
    What about the flapper material... and the led flashing code?

  9. #9
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,337
    Quote Originally Posted by Core_d View Post
    also fyi gass pressure for a pulse is 2'' W.C
    For some....not all.

  10. #10
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,337
    Quote Originally Posted by Becool View Post
    What about the flapper material... and the led flashing code?
    Your LED flashing just tells you it didn't fire and it's locked out. The flapper material is apart of servicing.

    Please, read the service manual I provided!

  11. #11
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,038
    yea im sure about the pressure switch looking at a schematic now to verify this i have checked this befor they r N.C

  12. #12
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,038
    also reading hear low voltage pin terminals are 24 VAC half rectified DC pulse current and your meter may read higher or lower than depending on the meter instead use troubleshooting guide.

  13. #13
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    Do them a favor and get it pressure tested, just condemned one Friday.

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