If a gas furnace flame characteristics change wen the___ comes on, severe deterioration of the heat exchanger may be indicated?

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  • 7 months ago

    UPDATE - my guess would be b - ignition control module; although c might make sense. ##fan motor ? burner ? warning light(s) ? - but with 30 years with a gas furnace I do not follow your question. It does not make sense to me. {Heat exchangers can crack, but I have never heard of severe deterioration.} The flame happens before the heat exchanger is involved.

    Source(s): My technician said that if the heat exchanger goes bad, buy a new furnace.
    • caine7 months agoReport

      It’s either
      a. gas valve
      b. ignition control module
      c. combustion blower
      d. indoor blower

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