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I have a nordyne-intertherm 10 seer split unit its about 10 years old.
the compressor on the outside unit does not come on or even attemp to come on in ac or heat mode, the outside fan does come on. Where should I start my trouble shooting ?

Heres some starting points:

Start/Run Capacitor

High Pressure Switch

Bad wire at compressor

could be lots of things but start with the easiest and most common