readCelsius() returns bogus data on ESP32

[QuickyTank]

My declaration;

#define SENSOR_PIN             NTC_PIN
#define REFERENCE_RESISTANCE   8000
#define NOMINAL_RESISTANCE     100000
#define NOMINAL_TEMPERATURE    25
#define B_VALUE                3950
#define ESP32_ANALOG_RESOLUTION 4095

// Global outside temperature reading
double outsidetemp;
Thermistor *thermistor; 
.
.
.
//read the thermistor to get outsidetemp
void ReadOutSideTemp(){
  digitalWrite(NTC_PWR_PIN, HIGH);    //provide power to NTC
  delay(1);
  outsidetemp = (thermistor->readCelsius())/6.0;  //tried dividing by 6 to get close number.
  digitalWrite(NTC_PWR_PIN, LOW);    //turn off the NTC power
}

Returns 83 for an outside temp of 14
Tried with removing the line #define ESP32_ANALOG_RESOLUTION 4095, no change.
Why?