Upon arrival the right side water furnace geothermal servicing the main level system was off at the thermostat but displaying a high pressure LED service code. When test ran the equipment turned on and operated normal as expected however the ground loop water pressure was very low at below 10 psi. Running refrigerant pressures appear to be normal even with low ground loop pressure but could be seriously affected with 100° outdoor temperature heat load while today is only 70°. During initial run testing and after repressurizing the ground loops the head pressure never ran above 360 PSI on two separate run tests with the second lasting 30 minutes plus. And producing 54° supply temperature New ground loop water pressure is 50 psi with one flow center and one ground loop servicing two split units Confirmed operation of both flow center pumps These systems are known to have failing high pressure switches due to vibrations and high pressure however they usually fail in an open electrical c