Question about Intertherm P3RA-048K Air Conditioner

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M#13qc-042k system will not go into defrost i replaced defrost board & sensor still no defrost

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  • Danny Clark
    Danny Clark May 11, 2010

    What is it set on?



    how are you trying to get it into defrost mode?



    Are you forcing it to frost up so the sensor senses frost before attempting a forced defrost cycle?

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There is typically a set of jumper pins on the defrost control board that allow the system to go into defrost after 30, 60, or 90 minutes of run time. There are also two bare pins that say "test" on them. While unit is running, approx 15 min or so in heat mode, short those two pins together for about 5 seconds, this will force the unit into defrost mode. If it still does not work, you might still have a defective board. Depending on the humidity in your area, that is how you determine the defrost interval.

Posted on May 18, 2009

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