DIY Network

All Projects

TV Projects

    What Do You Want To Work On?

      What Activity Do You Want To Do?

        0

        Available Projects

        Get Results

        DIY Network /

        Message Boards

            DIY Message Boards  Hop To Forum Categories  Home Improvement  Hop To Forums  General Home Improvement    AC/Heater Fan would not shut off, then....
        Go
        New
        Find
        Notify
        Tools
        Reply
          
        AC/Heater Fan would not shut off, then.... Sign In/Join 
        posted
        Good Morning to All,

        Have a 2002 Payne Electric AC/Heating Unit. Has been working fine, then this morning the fan kept running. It was in the normal Auto / Cool Mode to run the AC.

        No matter what I did at the thermostat, I could not turn off the fan motor. Went to the electrical box and turned-off the AC Unit 50amp breaker. This shut the blower fan off. During all phases of checking the unit, I waiting 2-3 minutes bc I know there is a time delay, but this did not matter.

        With thermostat in the off position, I flipper the breaker back on and the fan was running again. I decided to test the thermostat/condensing unit so I turned the temp down and hear the outside compressor condensing unit kick in. The air started cooling and when it reached the temp set, the outside condensing unit cut off, then the normal 1-2 minute delay of the fan also worked and the fan/blower inside cut off. Now it was working.

        I waited 10 minutes and decided to lower the temp more and the unit turned on, cycled and both inside and outside units cut off as normal.

        Does anyone know why the fan was stuck on initially and could only be turned off via the breaker? Was something stuck and now it is not? Can this happen again, or are there any things I need to do to further troubleshoot it?

        Thank you very much,
        tstex
         
        Posts: 352 | Registered: Jun 23, 2010Reply With QuoteReport This Post
        Picture of Jaybee
        posted Hide Post
        It will be difficult to trouble shoot as long as it is running properly.

        It could be a one-time or rare event: Bad relay or solenoid that could be randomly sticking. Often with newer electronic controls, cutting the power will "reboot" the system to get things working correctly again (although it sounds like this didn't directly help in your case).

        I would let it go and monitor the system to see if it does it again. If it does, your best repair path is to call in your H/A service guy. Odds are they can find something like this i a few minutes and have the parts needed to fix it.


        Jaybee
         
        Posts: 10305 | Location: Knoxville, Tennessee | Registered: Sep 27, 2003Reply With QuoteReport This Post
        posted Hide Post
        Thanks Jaybee.

        I am going to keep it under close watch, but since it is a weekend place, hard to monitor all the time.

        Since this is not a real DIY and rarely an issue, calling the tech seems to be the most viable option. However, I will have to do this when/if the problem reduplicates, plus it will be on the weekend.

        regards,
        tstex
         
        Posts: 352 | Registered: Jun 23, 2010Reply With QuoteReport This Post
        posted Hide Post
        I wouldn't hesitate to call it a welded/pitted relay contact. the relay is not an expensive part, which is some of the reason it hung Wink some of them have enough slop sideways to jam the contacts on the side of the fixed contact arm.

        next time around, just for jollies, pull the breaker, tap the relays, put the covers on the unit again and turn on power. that's as close as you can get to a fault diagnosis without knowing the unit.


        sig: if this is a new economy, how come they still want my old-fashioned money?
         
        Posts: 5729 | Location: North Burbs, MN | Registered: Mar 14, 2007Reply With QuoteReport This Post
          Powered by Social Strata  
         

            DIY Message Boards  Hop To Forum Categories  Home Improvement  Hop To Forums  General Home Improvement    AC/Heater Fan would not shut off, then....

        © Scripps Networks 2009

        Advertisement

        Posting Guidelines

        • Please be sure posts are category appropriate.
        • No off-topic or off-color postings.
        • Postings may be deleted at the discretion of DIY moderators.
        • No advertising is allowed.
        • Be nice. No name calling, personal attacks or flaming.
        • Certain words will trigger moderation of the post. These words mostly cover political or religious topics, which are OFF the topics covered by DIY.

        Full Guidelines

        For general message board help, click the tab labeled "Tools," and choose "Help" from the dropdown menu.