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    spaulb's Avatar
    spaulb Posts: 2, Reputation: 1
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    #1

    Mar 5, 2008, 04:55 PM
    Fuel odor after burner shuts off
    We have a Miller Kerosene Mobile home furnace. It runs fine! However after the burner shuts off and the blower is still on we smell burnt kerosene. I went outside while it was firing and the smoke is clear but the chimney cap is all sooty. We have noticed a thin black soot on the appliances in the house. I checked the peep hole door on the furnace and it is closed. The unit has been serviced every year including this one. I am concerned it might be a cracked heat exhanger box. Please help!!
    shmrckpl's Avatar
    shmrckpl Posts: 8, Reputation: 1
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    #2

    Mar 5, 2008, 05:34 PM
    You are giving the classic symptoms of a cracked heat exchanger... you can usually only see the small cracks while the furnace is burning... but I DO NOT recommend homeowners to do this - ONLY PROS...
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Mar 5, 2008, 06:36 PM
    I would call a pro as the other poster stated.
    They will need to use a tester because a mirror to look at the heat X might not do it.
    With soot on the chimney cap it could also be a bad check valve in the furnace oil pump allowing raw oil that has not burned into the combustion chamber. That will stink up the house also but the heat X is probably shot.

    The heat X for old millers are no longer available so you will need to replace the entire unit. I tried to find one last year and they are NLA.
    spaulb's Avatar
    spaulb Posts: 2, Reputation: 1
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    #4

    Mar 6, 2008, 05:01 PM
    Thank you both very much for responding so quickly. I will call for a service call and see what they say. The unit is actually 30 yrs old and has been virtually trouble free. So I guess I got my moneys worth out of it!! Thanks again so much! I will let you know what happens. Stephen
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