MQ7 stoppend sending readings to serial monitor

First I'm not completely sure if this is a problem with the sensor or the Arduino IDE itself

I have been working with the mq7 module from sainsmart ( I've had it plugged in and running for about 46 of the 48 hour warm up time suggested in the datasheet when all of a sudden the serial monitor stopped printing out the readings. I have it set up in the code so it sends out a reading that is "sensor = " then gives the value and it stopped printing out mid way just saying "sen" and it hasn't gotten a reading since. I've tried closing and reopening the serial monitor to make sure it just hadn't frozen up but after reopening, it still won't print out and results. here is the code I used that I found from a tutorial online on using mq series sensors.

const int analogInPin = A0;
const int ledPin = 13;

int sensorValue = 0;

void setup(){
  pinMode(ledPin, OUTPUT);

void loop() {
  sensorValue = analogRead(analogInPin);
  if (sensorValue >= 750)
    digitalWrite(ledPin, HIGH);
    digitalWrite(ledPin, LOW);
  Serial.print("sensor =");

Have you tried reloading the sketch to see if it will run?
In true IT from, "Have you turned it OFF and ON"?

Tom...... :slight_smile: