Waterfurance 7 Series geothermal unit is running in perfect condition. Refrigerant and ground loop pressures and temperatures are within spec. Cooling operation is within spec. Tested operations and took measurements through Aurora Aid Tool. Air filter is in decent condition. Recommend changing in approximately 1-2 months. Normal codes for operations are present such as HW limit and system reset. Code E55 for Out of Envelope is tripped when outdoor temperatures are low enough that the self learning part of the system knows to automatically start at a higher stage than normal to prevent unsatisfactory operation. Code E55 does not have anything to do with the incoming high voltage that was discussed while maintenance was being my performed. No issues were found and system is operating properly.