MAX6675 gives a climbing reading

Question

I am using a MAX6675 board and a k-type thermal couple to measure temp. The problem is even when running the example the temp value keeps climbing.

MAX6675 test
27.25
C = 27.25
F = 130.10
109.00
C = 218.00
F = 816.80
872.00
C = 1744.00
F = 2624.00
832.00
C = nan
F = nan
512.75
C = nan
F = nan

I am using the max6675.h library. Is there a way to fix this?

#include "max6675.h"

int thermoDO = 4;
int thermoCS = 5;
int thermoCLK = 6;

MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);
int vccPin = 3;
int gndPin = 2;

void setup() {
  Serial.begin(9600);
  // use Arduino pins 
  pinMode(vccPin, OUTPUT); digitalWrite(vccPin, HIGH);
  pinMode(gndPin, OUTPUT); digitalWrite(gndPin, LOW);

  Serial.println("MAX6675 test");
  // wait for MAX chip to stabilize
  delay(500);
}

void loop() {
  // basic readout test, just print the current temp

   Serial.print("C = "); 
   Serial.println(thermocouple.readCelsius());
   Serial.print("F = ");
   Serial.println(thermocouple.readFahrenheit());

   delay(1000);
}

edit: Added code (https://github.com/adafruit/MAX6675-library/blob/master/examples/serialthermocouple/serialthermocouple.pde)

Answer 1

After test some other K-type thermal couples on this I am now thinking I just got a bad board. I was able to order a new one and it worked without issue