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-   -   Carrier furnace flame (only) cycling (https://www.askmehelpdesk.com/showthread.php?t=329924)

  • Mar 16, 2009, 10:01 AM
    Bob Piccinini
    Carrier furnace flame (only) cycling
    I have a Carrier 58GS furnace. It appears to be operating fine until I stood next to it.
    The gas flame comes on and off about every 5 seconds. This is not to be confused with short cycling. The blower is running as it should be and at the appropriate times. Thought before I dug into it, the forum may already have the answer.

    Thanks for any help,

    Bob
  • Mar 16, 2009, 09:10 PM
    wmproop
    Try cleaning the flame senser,, is located near the burners,don`t confuse it with the igniter
  • Mar 16, 2009, 09:28 PM
    Bob Piccinini
    Quote:

    Originally Posted by wmproop View Post
    try cleaning the flame senser,,,,,is located near the burners,don`t confuse it with the igniter

    Thanks wmproop, I'll give it a shot.
  • Mar 16, 2009, 10:17 PM
    white732
    Is your Carrier 58GS equipped with a "standing pilot" ignition system, or does your furnace have a "electronic spark ignition"system?
  • Mar 17, 2009, 04:19 AM
    Bob Piccinini
    Quote:

    Originally Posted by white732 View Post
    Is your Carrier 58GS equipped with a "standing pilot" ignition system, or does your furnace have a "electronic spark ignition"system?

    Electronic Spark, I miswrote earlier, it is a 58DR
  • Mar 17, 2009, 05:45 AM
    hvac1000
    1 Attachment(s)
    If you have a 3 wire pilot that can be the cause.
  • Mar 17, 2009, 05:52 AM
    white732
    Bob, your pilot assembly would be the first starting point, it's the cheapest and first place to start. After 20 years it's the primary cause for your problem.
  • Mar 17, 2009, 05:55 AM
    white732
    Bob, I miss wrote. I have retired with 20 years in the field and found your type of pilot will cause your problem.
  • Mar 17, 2009, 10:21 AM
    wmproop
    Quote;;The gas flame comes on and off about every 5 seconds.

    I understood this to mean the pilot was working,, but the flame not staying on in the burners
  • Mar 17, 2009, 10:23 AM
    wmproop
    Guess I understood the pilot was working but the flame in the burners was going out every 5 seconds
  • Mar 17, 2009, 11:09 AM
    Bob Piccinini
    Quote:

    Originally Posted by wmproop View Post
    guess I understood the pilot was working but the flame in the burners was going out every 5 seconds

    The above quote is correct. I cleaned all connections along with the flame sensor. It is working for now. Looks like it is the pilot assembly causing the problem. Won't hurt for me to get a new one regardless. Thanks for all the help and rapid responses. First time on this forum and it was a great experience.

    Bob
  • Mar 17, 2009, 12:01 PM
    hvac1000
    The old 3 wire pilot will allow contact for a few seconds then drop out the gas valve then make connection again. This has been a longstanding problem with the 3 wire pilots. Years ago we used to adjust them in the field but no more just replace. All during this time the pilot will be on.

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