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  1. #1
    Join Date
    Jul 2012
    Location
    Atlanta ga
    Posts
    227

    DIRECT IGNITION PROBLEM SHOULD BE SIMPLE!

    Hello, I have a customer who's heat is not working. I approach the furnace and see what I have, I jumped the r to w and everything did as its suppose to do ,when my burners lit it stayed on for about 4 to 8 seconds and shut off now from my knowledge and experience I have had a furnace that did this once before and it was simply the flame sensor rod needed cleaning. I tried to run the system twice, both times main burner shut off so I disconnected the flame sensor rod cleaned it with sand paper and also if that didnt work I was going to test it by disconnectng the the wire from the terminal and placing one lead on terminal and one lead on flame rod wire from my knowledge any direct current above 2,0 is good and below 1.6 is a bad flame rod but after I clean the rod and install it back into the furnace the hot surface igniter lights but burner want light at all, I do have 24 volts coming from ifc,to valve all switches are closed roll out limit switches etc they should because no reason for them to open when there is no fire.

    From my knowledge I feel like its no gas pressure or no gas flow the gas valve has a coil ohm reading of 98.0 ohms I think thats about right because from another job I replaced a gas valve and the reading was 60 something and the new one read about 90 some thing or 100 ohms so gas valve I suspect is good. And the customer gas was just cut back on yesterday morning, and another thing that bothers me there is no shut off, drip tap, or union near this unit. So I feel the first 2 times the burners lit was old gas that was still in the line, first I need to see is the shut off open, I dont have a water manometer to check the gas pressure in and out the valve, any suggestions, I know the sequence of operation and all, I am a certified tech but nothing but 4 years experience still come across problen that I have to go back to my book for, I know I am in the ball park because to me heat cycle is very simple, worse case senario ifc is bad which I doubt. Input output is good or gas valve is not functioning correctly but I doubt also , and another thing the blink lights is one blink which mean ignition failure probable causes gas pressure no gas ,gas valve, flame sensor, and if this could be cause by a open limit or roll out or over temp stack let me know but I seriously doubt it because I think these open when burner is lit, let me know pros and service techs.
    Last edited by beenthere; 11-03-2012 at 09:46 AM. Reason: Got rid of all caps, added some punctuation

  2. #2
    Join Date
    Feb 2010
    Location
    Calgary, Alberta
    Posts
    1,104
    Was that all one sentence? And why do my ears hurt?

  3. #3
    Join Date
    Jan 2010
    Location
    new orleans
    Posts
    230
    SO I'VE HEARD

  4. #4
    Join Date
    Jan 2012
    Location
    Tallahassee,Fl
    Posts
    144
    Check the obvious first, if its LP check the tank maybe empty, if natural gas meter may be locked out due to no pay....

  5. #5
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,953
    Quote Originally Posted by Youngwiseman View Post
    I DISCONNECTED THE FLAME SENSOR ROD CLEANED IT WITH SAND PAPER
    I lost you after this, but you never clean a flame sensor with sandpaper, steel wool at the most, I usually just use a dollar bill.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  6. #6
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,350
    DONT POST IN CAPS!!!!!!!!
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  7. #7
    Join Date
    May 2006
    Location
    Philadelphia, PA
    Posts
    1,384
    Quote Originally Posted by Youngwiseman View Post
    ....I DONT HAVE A WATER MANOMETER TO CHECK THE GAS PRESSURE IN AND OUT THE VALVE, ANY SUGGESTIONS, .....
    One all caps run-on sentence and this jumped out at me. You should not be touching the appliance without this most basic service tool.

    Other than that please stop posting in all caps and add some punctuation.
    Climate Control Solutions for your Home or Office

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  8. #8
    Join Date
    Dec 2007
    Posts
    4,699
    "... I DONT HAVE A WATER MANOMETER TO CHECK THE GAS PRESSURE IN AND OUT THE VALVE, ANY SUGGESTIONS..."

    match!
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

  9. #9
    Join Date
    Aug 2012
    Location
    NE wisconsin
    Posts
    402
    I DON'T KNOW WHAT WE'RE YELLING ABOUT!!!

    I love lamp

  10. #10
    Join Date
    Feb 2011
    Location
    Indianapolis, IN
    Posts
    34

    Several "issues " and then some

    I would address the gas pressure and and train not having union, drip leg,or gas cock are code violations to start with...

  11. #11
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    Got rid of the all caps.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  12. #12
    Join Date
    Sep 2012
    Location
    Ottawa, Canada
    Posts
    28

    Thumbs up

    I've seen the bill trick when I was in training. Ya don't want to be rough on it. Good advice to new techs.

  13. #13
    Join Date
    Sep 2012
    Location
    Ottawa, Canada
    Posts
    28
    I never heard it called a water manometer, regardless, you need more than a manometer to do this job, and done by a trained professional. You can cause a lot of problems and dangers if you don't know what your doing.

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