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Question: Amana sse furnace high limit switch open light blinks 4 times where is switch and why?

Question by : Amana sse furnace high limit switch open light blinks 4 times where is switch and why?

Best answer:

Answer by Marko
It’s located in the heat exchanger and opens on high heat due to dirty h.e., low airflow. Change filter first and see if that is it. Make sure of free air flow at return. Could be a bad switch, circuit board, restricted vent.

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3 Responses to Question: Amana sse furnace high limit switch open light blinks 4 times where is switch and why?

  1. Thor

    I would like to add:

    Other than a dirty plugged filter causing an over heat condition so can having too many of the vents in the home closed. That restricts air flow as well. A dirty blower wheel that hasn’t been vacuumed in years moves less air too.

    Also those high limits tend to trip when you have a power outage if the furnace was running when you lost power. It didn’t go through a cool down cycle before the blower stopped when the power was lost so the residual heat in the furnace can rise and trip the limit.

    Good Luck.

  2. Boe

    There should be 3 limit switches on that furnace. 1 is the high limit atop the burners. Two wires come off it round disc. If the center of it has a white or red button push it in that will reset it. If no button, that style should reset automatically when the furnace cools down. The other two or roll out switch and should be parallel to each other. Again same thing with the button or auto reset.

    Make sure the furnace filter is not, plugged up, the blower is working ( you can test this by setting Tstat fan from auto to ON)

    If all else fails, turn the power off at the furnace. Make sure it calling for heat when you shut it off. When you turn it back on leave the door panel off to the furnace, hold door switch in. Observe whats going on. That may also help you.
    Note: When you kill the power to the furnace it resets the fault code on the control board. If the system runs for a short time, then goes into fault, again verify the # of flashes like you did.
    Here is a link to a random site to show you what it looks High limit like https://www.centraltrailer.com/cart/index.php?main_page=product_info&products_id=320

    Here is the roll out limit switch what it looks like http://bestbuyheatingandairconditioning.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=LIMD25303217&Category_Code=FL

  3. john

    mike its on the back firewall that separates the heat exchanger.
    its usually a small silver button most of the time it is reset manually
    so it should have a little red plunger in the middle of it to push in. if it
    doesnt than it reserts automatically when it cools down, but you have to
    figure out why it went off, usually a dirty filter, or a bad blower motor.

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