diff --git a/src/main.cpp b/src/main.cpp
index 9881020..9d57dbf 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -27,10 +27,10 @@ Adafruit_MAX31865 thermo = Adafruit_MAX31865(5, 23, 19, 18);
 //Adafruit_MAX31865 thermo = Adafruit_MAX31865(10);
 
 // The value of the Rref resistor. Use 430.0 for PT100 and 4300.0 for PT1000
-#define RREF      430.0
+#define RREF      4300.0
 // The 'nominal' 0-degrees-C resistance of the sensor
 // 100.0 for PT100, 1000.0 for PT1000
-#define RNOMINAL  100.0
+#define RNOMINAL  1000.0
 
 void setup() {
   Serial.begin(115200);