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  1. #1
    Join Date
    Dec 2007
    Location
    morrison, illinois
    Posts
    111

    carrier fault code 33 on 58mvc

    have fault code 33 on carrier mvc, works fine in high fire, ran fine for 10 minutes each in low and medium fire through the check out in infinity controller. brand new infinity air purifier filter installed in november and is clean, all gas pressures are in range when tested and temperature rises in all 3 stages are good. anyone with a possible solution or something i missed would be appreciated. i am in the business and have installed many of these furnaces without trouble.

  2. #2
    Join Date
    Nov 2012
    Location
    New Jersey
    Posts
    3
    Make sure the metal around the main limit isn't too close to the heat exchanger. If its too close it'll pick up the heat and give you a false limit trip.

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,117
    Moved to Tech to Tech forum.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #4
    Join Date
    Nov 2009
    Location
    Northwest Illinois
    Posts
    277
    How long is it on high fire? I've seen the limit trip many times on the MVC and all I can say is that it's a crap shoot as to why in some cases.
    I personally hate that furnace, do a google search for the troubleshooting guide, that might help you out.

  5. #5
    Join Date
    Dec 2007
    Location
    morrison, illinois
    Posts
    111
    Quote Originally Posted by stay gold jonny View Post
    How long is it on high fire? I've seen the limit trip many times on the MVC and all I can say is that it's a crap shoot as to why in some cases.
    I personally hate that furnace, do a google search for the troubleshooting guide, that might help you out.
    ran in high fire 10 minutes, been installed since 2008 and trouble free

  6. #6
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,296
    How close are you on temp rise?

  7. #7
    Join Date
    Nov 2009
    Location
    Northwest Illinois
    Posts
    277
    How many limit faults did the Infinity Control have listed? It's possible that this has been going on for a while. 10 minuets might not have been a long enough run time for the heat to build up and trip the limit.
    What is the set back on the control? I've found that if it has to raise the room temp by 5* or more that high fire will be on for a long time, factor in colder outdoor temps and it will run even longer on high fire
    I did notice that on an 80k btu MVC the limit size is 180* and on a 120k btu it's 170*, not saying its wrong just didn't seem right.

  8. #8
    Join Date
    May 2010
    Posts
    12
    We had this issue in our unit. 33 and 34, unit would only run in high heat. There was a service bulletin out for this problem, the tech had to remove some metal shrouding inside the unit and the codes went away.

  9. #9
    Join Date
    Jun 2012
    Location
    Rising Sun, Maryland, United States
    Posts
    110
    Try bumpin up the blower speed I think it's normally med low I would try med high and see if it stops

  10. #10
    Join Date
    Aug 2012
    Location
    NE wisconsin
    Posts
    402
    Secondary hx partially plugged with the liner peeling off. What kind of numbers are you getting with the combustion analyzer?

  11. #11
    limit shield is to close to heat exchanger,heating limit up causing false trip. bend shield back inward away from exchanger

  12. #12
    Join Date
    Dec 2005
    Location
    Cleveland, OH
    Posts
    2,313
    Anyone got a link for the service bulletin?
    Good? Bad? I'm the guy with the gun.

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