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  1. #1
    Join Date
    Sep 2010
    Location
    Gering, NE
    Posts
    14

    Flame sensor needs cleaned monthly

    Had a no heat call today on a system I was at a month ago for regular maintenance and found today that the flame sensor was dirty I was reading .2 ua so I cleaned the flame sensor check my ua and it was back up to 2.8 after cleaning my problem with that though was that I cleaned the flame sensor on the maintenance call and was reading 2.8 ua after cleaning it then as well I got to looking at the work history on this call and saw that our company (i have only worked with this company for the past 7 months) has been out there 3-4 times a year cleaning this flame sensor and has even been replaced twice any suggestions as to why this may be getting dirty so quick so I can get this problem resolved and keep a good loyal customer from getting angry with the company

  2. #2
    Join Date
    Feb 2010
    Location
    Calgary, Alberta
    Posts
    1,120
    Check for leaky dryer vent, open laundry detergent containers, open paint cans, litter boxes, or anything else of that nature.
    Then check for adequate combustion air supply.

  3. #3
    Join Date
    Jul 2000
    Location
    Northern Wisconsin
    Posts
    2,032
    Something in the air is contaminating it. Find the source and remove it or find a different source of combustion air. The next problem you'll probably be seeing is a HE failure if you don't.
    Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.

  4. #4
    Join Date
    Apr 2004
    Location
    MN
    Posts
    1,810
    If it's sealed combustion, make sure the intake is pulling in clean air. No recirculation, no other exhausts nearby etc. If it draws combustion air from the room, as mentioned by others, check for contaminants and remove.
    A Veteran is a person, who at some point in their life, wrote a blank check payable to the United States of America for payment up to and including their life.
    Gene Castagnetti-Director of the National Memorial Cemetery of the Pacific in Hawaii

  5. #5
    Join Date
    Sep 2010
    Location
    Gering, NE
    Posts
    14
    Thanks everyone for the replies this is a residential furnace 80 percent however it is installed in a dry clean drop off building meaning clothes are dropped off at this building the clothes are then removed from the building washed and the reaturned so the litter box for a cat is out, the dryer vent is out because there is no dryer They don't do any cleaning at all in this building laundry deteregent is out and it's mounted in a suspended ceiling with plenty of combustion air. Kinda like wtf is going on because it is a very clean building

  6. #6
    Join Date
    Aug 2012
    Posts
    2,675
    If you cleaned it with sandpaper it might be corroding.
    My name is TooCoolforschool and I am a chronic over charger.

  7. #7
    Join Date
    Sep 2010
    Location
    Gering, NE
    Posts
    14
    Cleaned it with a steel brush

  8. #8
    Join Date
    Aug 2012
    Posts
    2,675
    I think steel wool is the way to go. Might have chinese drywall or oil refinery near by, just throwing darts.
    My name is TooCoolforschool and I am a chronic over charger.

  9. #9
    Join Date
    Apr 2012
    Location
    Cleveland
    Posts
    611
    Have the burners been cleaned? I've seen crud in the burners come out and coat the sensor.

  10. #10
    Join Date
    Feb 2010
    Location
    Calgary, Alberta
    Posts
    1,120
    So dirty clothes come in to the building?
    Where do you think dryer lint comes from?
    What does the sensor look like when you remove it?
    Ash coated? Discoloured? Burnt? Or clean?

  11. #11
    Join Date
    Sep 2010
    Location
    Gering, NE
    Posts
    14
    Looks spotless

  12. #12
    Join Date
    Jul 2000
    Location
    Northern Wisconsin
    Posts
    2,032
    Quote Originally Posted by tkhvacguy View Post
    Looks spotless
    Well if cleaning it increases the ma, it's not spotless.......... that is unless.......... the connection is the culprit. That'd be a new one on me.

    Contamination of the sensor can be in many forms. Something is increasing the resistance of it.

    Did you say it was mounted above a suspended ceiling? Is the ceiling the fiberglass ceiling tile type with the metal grid work? Might be microscopic fiberglass particles being melted onto the sensor. Glass is a good insulator and would be hard to see.
    Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.

  13. #13
    Join Date
    Sep 2010
    Location
    Gering, NE
    Posts
    14
    That's a good point I do believe its a fiberglass tile not only that bit it's got the pink rolls of insulation right above it I could very well be getting insulation on it ill have to check it out but if that's the case the only way to correct it is to get its combustion air from outside and we would probably have to put a 90 percenter in instead well see what comes of it thanks for the help guys

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