DHT22 Sensor With Relay is not working

board : arduino mega 2560
my code
when humidity > 90 why relay not working???
sorry language english not primary language

#include <simpledht.h>
int pindht22 = 22;
simpledht22 dht22;

int fanrelay = 13;

void setup() {
  serial.begin(9600);
}

void loop() {
  // start working...
  serial.println("=================================");
  serial.println("sample dht22...");
 
  float temperature = 0;
  float humidity = 0;
  int err = simpledhterrsuccess;
  if ((err = dht22.read2(pindht22, &temperature, &humidity, null)) != simpledhterrsuccess) {
    serial.print("read dht22 failed, err="); serial.println(err);delay(2000);
    return;
  }
 
  serial.print("status: ok");
  serial.print((float)temperature); serial.print(" *c, ");
  serial.print((float)humidity); serial.println(" rh%");
 
  delay(1000);

  if ((float)humidity > 75){
   digitalwrite(fanrelay, high);
  } else{
   digitalwrite(fanrelay, low);
  }
}

you didn't use code tags when posted. didn't call pinmode() on fanrelay.

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