Question about Amana PTC123B35AE Air Conditioner

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8 flashes, bad IAT

How do I fix my PTAC, I have 8 flashes, "replace room thermistor (IAT)"

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Re: 8 flashes, bad IAT

Take the buttons off of your unit and remove the board cover by taking out the 2 screws on each side holding it in.  You will See on the right hand side of the board 4 post specifically , 2 for your indoor thermistor and 2 for your outdoor.  unplug your inddor  from the board ( make sure power is off)   and there should be a plate you can remove on the front of the unit on the right hand side of your evaporator coil , remove this and disconnect your thermistor from the coil (should snap right off )   pick up a new thermistor and just slide it right back in.

Posted on Oct 13, 2007

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Re: 8 flashes, bad IAT

I have PTAC PTH123A50AB that has red LED that flashes, and the air is warm. No cold air at all.

Posted on Aug 02, 2008

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If the air bounces back off of something then it will cool that Thermoster and shut the unit down before the desired room temp is acualy reached.
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