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Thread: flame roll out

  1. #1
    Join Date
    Jan 2012
    Location
    Roanoke Rapids NC
    Posts
    49

    flame roll out

    To start i have a trane gas pack that was put in in 1995. I was in the house about 2 months ago and noticed it was blowing cold air. So i went outside and checked the unit and the circuit board was blinking 5 times. So i checked the manual and it said that it meant the TCO was open. I looked at the TCO and noticed it was rusted up kinda bad so i took the wire off and ohmed it out and it was open. The connections were so rusty i decided to change it out. Well it went back to working. the next day i get the same thing. So i go back out to the unit and it is blinking the same thing. This time i notice the wires may be a little loose at the connector so i put new connectors on and it goes back working. Then that same day it quits again. I took the wire off and ohmed the TCO and it said it was closed but the board said open. When i went to put the wire back on i accidently shorted it on the side of the unit. Well it has worked fine since then. This morning i get up and its blowing cold air again. I went out side and its just steady blinking which is a sign of normal call for heat. I kept hearing it sound like it wanted to ignite but it would not light. so I know this was probably not the right thing to do but i shorted the wire and it went to working again. any idea what is causing this? its got me stumped. The heat exchanger was changed in late 2005

  2. #2
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,516
    sorry we can not give DIY advise here
    all i can say is flame rollout is cause by a few differant reasons and you realy need to call and have it checked out and serviced

  3. #3
    Join Date
    Jan 2012
    Location
    Roanoke Rapids NC
    Posts
    49
    sorry guess i didnt read the rules clearly enough

  4. #4
    Join Date
    Jul 2008
    Location
    Denver, CO
    Posts
    4,229
    I would definatly shut the furnace down and get a contractor out to take a look. If your TCO is open and opened due to flame roll out and your run it jumpered out like that, you run the risk of catching your furnace on fire. Don't ever tamper with a safety switch on a furnace, thats extremely dangerous.

  5. #5
    Join Date
    Jan 2012
    Location
    Roanoke Rapids NC
    Posts
    49
    Quote Originally Posted by Tiger93rsl View Post
    I would definatly shut the furnace down and get a contractor out to take a look. If your TCO is open and opened due to flame roll out and your run it jumpered out like that, you run the risk of catching your furnace on fire. Don't ever tamper with a safety switch on a furnace, thats extremely dangerous.
    The TCO is not open thats the thing. If i take a wire off and ohm out the TCO it says closed. Also i know its dangerous to run it with a jumper. There is not one on there. I would not risk something like that. I figured it could only be a couple of things and thats the heat exchanger is messed up knocking it out or the circuit board is giving it a false reading. I am working on it at my house but i do work within an HVAC field. I took a class in HVAC/R and have my epa certification. I have talked to several techs and gotten mixed answers thats why i asked here. I understand after rereading the rules now the risk involved in you guys giving out information to an DIYer

  6. #6
    Join Date
    Jul 2008
    Location
    Denver, CO
    Posts
    4,229
    It may ohm out with a meter but when you try and run a load through the TCO it will not carry the load. I have seen that once, that why I always check for a voltage drop with the switch in the circuit. You did mention the furnace tried to fire, if the circuit board sees an open safety it will not even try to fire, it will just bring on the blower.

  7. #7
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,945
    m-cooling

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