Question about Intertherm Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: m#13qc-042k system will not go
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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