a419 Stuck on Heat
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  1. #1

    a419 Stuck on Heat

    Hey guys,

    This is my first time posting on the site.
    Has anyone ever seen an a419 thermostat get stuck on heat mode? The jumper pins are in the correct spot. It was working perfectly on cooling mode, then two days later it is stuck on heat.

  2. #2
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,494
    If your positive it's the control, replace it.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  3. #3
    Oh yeah, it is definitely the control, and that is my plan. But it just seems really strange that it would randomly switch onto heat, wondering if anyone else has ever experienced that.

  4. #4
    I have seen quite a few do this, mostly in very cold temperatures. I believe it is due to something breaking and shorting out behind the pins if someone moved the jumpers too roughly

  5. #5
    Join Date
    Dec 2012
    Location
    Illinois
    Posts
    256
    I had a drawer set at a location trash 3 A419 controls within 6 months. I discovered the back side of the board where the setting pins are soldered t the board, corrosion was occurring causing the pins to short. This was happening on new controls at less than a month old. I talked to Johnson tech line, of course they said it was environmental and not a problem with their units. So on the last one I installed I coated that area of the board with the NSF silicone that I carry. That was 6 months ago.

    That's exactly what mine were doing, check the back of the board when you pull it out and silicone the back of the new one where the pins are. The silicone won't hurt anything.

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