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Fan Motor - Check the fan motor, oil it, & make sure it runs perfectly!
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Air Filters – Check air filters for any clogging. Replace air filters.
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Fan Belts - Test the fan belts. Check any old or loose fan belts.
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Refrigerant Pressures - Ensure operating pressures on refrigerant is within manufacturer specs.
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Electrical - Check the electrical wiring and tighten connections.
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Contactor - Test the compressor contactor for proper operation.
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Capacitors - Test capacitor voltage balancing under all modes of operation.
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Inspect Condenser Coil - Check the outdoor AC condenser coil for correct performance.
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Measure Sub-Cooling - Ensure outdoor sub-cooling is within manufacturer specs.
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Compressor Operation - Test the compressor voltage and mechanical operation.
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Crankcase Heaters - Test the crankcase heaters.