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    jhuether's Avatar
    jhuether Posts: 1, Reputation: 1
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    #1

    Nov 13, 2010, 12:43 PM
    Gas furnace high limit switch burns out mfg no. sugk 100ah02
    1983 gas furnace. Had to replace the limit switch 4 times in past 5 years. Some of the flames change from blue to yellow after the blower kicks on. I suspect leaky heat exchanger. Should I replace the exchanger? Model No. 867.769234; Mfg. No. SUGK100AH02. Can I do it myself?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    Nov 13, 2010, 04:40 PM

    Why replace a eat exchanger in a 28 yr furnace. Time for a new higher eff one. Price of a heat excanger and labor to install not worth it.
    jrhuether's Avatar
    jrhuether Posts: 1, Reputation: 1
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    #3

    Nov 15, 2010, 12:14 PM
    Joshdta: thanks. Any idea on what a reasonable cost range might be? It's a 4-bedroom, 2-story frame house with basement, built in 1938.
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