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    jgshk's Avatar
    jgshk Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Oct 18, 2011, 06:48 AM
    What are signs that a gas furnace needs to be replaced even though it is working fine
    I was told that I should probably get a new gas furnace because (I quote from service ticket): "Upon inspecting operations found flame becoming erratic when blower comes on. Used inspection mirror and searched as far as it could reach. I noticed significant rusting and what appeared to be pitting or small pin holes. Recommend replace furnace and/or entire system!" The furnace seems to be working fine. It is an older Trane (maybe 25 years),
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Oct 18, 2011, 07:13 AM
    Cracks or deep pits in the heat exchanger are a big sign to replace, this could release raw carbon monoxide into your how. The erratic flame by itself is a concern but not a huge one. It will get worse and is inefficient, can produce more dangerous fumes.
    JonesHVAC's Avatar
    JonesHVAC Posts: 173, Reputation: 12
    Junior Member
    		  
    #3

    Oct 18, 2011, 01:00 PM
    The erratic flame is a sign of a crack in the exchanger as well. Being that the furnace is 25+ years old it has definitely lasted its lifetime. I would strongly urge you to replace the furnace. The crack in the exchanger will open wider each time the furnace fires due to heat expansion and contraction.
    Fr_Chuck's Avatar
    Fr_Chuck Posts: 81,301, Reputation: 7692
    Expert
    		  
    #4

    Oct 18, 2011, 01:05 PM
    I will agree, just the statement it is 25 years old, sort of stops me there. Newer models will run better and be a good cost savings.
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