Flame sensor micro amps
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  1. #1
    Join Date
    Jun 2003
    Location
    Battle Creek MI Occupation: Simi-retired 57 year old, in home and shop appliance tecnician, (since 1967).
    Posts
    62

    Hmm

    Lennox G2003E-75-2. Has spark-to-pilot module and seprate sensor rod. It has a pretty blue pilot with good impingement, I cleaned the sensor rod with a soft brass brush and clean white paper, my Fluke reads 1.4 micro amps in series with the sensor. The main valve wont kick in and the furnace goes into lockout. What micro amp reading should I be getting? (I think I have a weak module.) Thanks guys, from a 'retired' tech with a bad memory.

  2. #2
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    your reading seems ok

  3. #3
    Join Date
    Apr 2004
    Posts
    7,680
    so what is the voltage from the sensor to ground?

  4. #4
    Join Date
    Apr 2005
    Posts
    517
    Check for voltage at the main gas valve terminals or at the module output serving the gas valve. If your microamps are good your module should energize the gas valve main valve.

  5. #5
    Join Date
    Nov 2000
    Location
    Waco, Texas, USA
    Posts
    6,153
    Try reversing the polarity. Your 1.4΅A reading should go up to 2.8΅A
    "And remember my sentimental friend......that a heart is not judged by how much you love, but by how much you are loved by others" - Wizard of Oz.

  6. #6
    Join Date
    Jun 2003
    Location
    Battle Creek MI Occupation: Simi-retired 57 year old, in home and shop appliance tecnician, (since 1967).
    Posts
    62
    I'm going back tomorrow, this furnace has worked fine 'till this season. Did you mean to check the polarity of the 120vac that powers the furnace? I will do that before replacing anything, however I do need to check for 24vac at the gas valve and continuity of the main coil on that valve also. The spark that lights the pilot keeps clicking untill lockout. I do expect voltage from the sensor to ground, but then again I don't remember what that reading should be. I do remember on some HSI units that if you get 103 to 105v from the sensor to ground, then the module is bad. Is it the same for spark to pilot? Thanks again guys.

  7. #7
    Join Date
    Apr 2003
    Posts
    6,383
    Originally posted by wishful
    The spark that lights the pilot keeps clicking untill lockout.
    Here's your sign!




    I'm kidding BTW.

  8. #8
    Join Date
    Jan 2003
    Posts
    959

    pv to mv

    make sure all you limits are good..

    roll out switch, high limit, provent switch, etc, all these could hold it back. What model of controler would help.

    When u get a pilot jump pv to mv. This will verify you have a good gas valve.

    regadrs,
    kelvin

  9. #9
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    ake sure the connection for the flame senser to the control is good and tight. i have seen a lot with loose spade connections and the true signal never reaches the control. i have also seen cases where the clip that holds the senser in place is loose and the senser drops down a little and dose not get the right recifacation.
    personaly i think you have a defective control. but just a guess

  10. #10
    Join Date
    Mar 2004
    Location
    Gone
    Posts
    5,340
    Why don’t you idiots just give your phone numbers out so you can give every homeowner in the country step by step free advice so no contractor in the country can make a living.

    All you idiots are doing is building a file where every homeowner can go hit search and solve their problems here instead of calling a local contractor.

    What the heck do you think the Pro technical forum is for? Did you ever possibly think it might be to discuss matters such as this?

  11. #11
    Join Date
    Nov 2001
    Location
    chicago
    Posts
    101
    Hey made in the usa good point, i hope they listen to you.

  12. #12
    Join Date
    Nov 2000
    Location
    Waco, Texas, USA
    Posts
    6,153
    Yeah I agree. By the lingo he was using he sounded competent but after reviewing his past posts I now realize he is an illegal side jobber being very selfish in taking work away from legitimate contractors. Sorry wishful, no more technical help.
    "And remember my sentimental friend......that a heart is not judged by how much you love, but by how much you are loved by others" - Wizard of Oz.

  13. #13
    Join Date
    Oct 2005
    Location
    Canada
    Posts
    256
    One must keep an open mind.
    it could be an "impossible" to clean impregnated sensor rod even another malady of same.
    OR could be 'nother issue entirely.

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