Water furnace Envision NDV064 package geothermal system is running in fair condition considering a leaky pressurized ground loop system currently running just above 0 psi that also has one of two float center pumps locked up.. the heavy alcohol antifreeze has a on-site reservoir that is full but not pressurized. Recommend homeowner consider upgrading to new non-pressurized 2 pump flow center. Homeowners original complaint of airflow light flashing and intermittent no cooling throughout the summer was addressed with Waterfurnace tech support for assistance. Tech support explained that airflow lights can be triggered falsely and are a nuisance in water furnace Envision equipment brought forth by older technology. Tech support advised turning dip switch 3-3 to the left to stop sensing for RPM. And explained that if a real problem exists a different service code will appear such as high\low pressure or freezing. Air filter is on schedule quarterly with homeowner but does currently appe