Outdoor fan and indoor blower controller for heating, ventilation and air conditioning system and method of operation thereof

An HVAC system, comprising:

• an outdoor unit, including:
• at least two compressor stages,
• at least two corresponding condenser fans,
• at least two corresponding refrigerant pressure sensors,
• at least one condenser coil, and
• an outside air temperature sensor;
• an indoor unit, including:
• at least one evaporator coil,
• at least one indoor blower, and
• at least one expansion valve;
• and
• an HVAC controller, including:
• a processor couplable to said at least two refrigerant pressure sensors via separate data paths to receive input signals therefrom and further couplable to said at least two compressor stages and said at least two condenser fans to provide output signals thereto, and
• memory coupled to said processor and storing a software program having instructions capable of causing said processor to command one of said at least two compressor stages and a corresponding one of said at least two condenser fans to turn on irrespective of a state of an input signal generated by either of said at least two refrigerant pressure sensors and generating alternative error messages at least partially depending upon whether or not a high pressure shutdown occurs after said processor commands said one of said at least two compressor stages and said corresponding one of said at least two condenser fans to turn on.