diff --git a/reflowctl/reflowctl.ino b/reflowctl/reflowctl.ino
index 33bcf4e..7f80221 100644
--- a/reflowctl/reflowctl.ino
+++ b/reflowctl/reflowctl.ino
@@ -10,16 +10,16 @@
 #define ERROR_STATE 8
 
 // error conditions
-#define E_DT_MIN 1 // temperatur dt too small
-#define E_DT_MAX 2 // temperatur dt too big
+#define E_DT_MIN 1 // temperature dt too small
+#define E_DT_MAX 2 // temperature dt too big
 #define E_TIME_MAX 4 // reflow process does take too long
 #define E_TL_TOO_LONG 8 // package was roasted
 #define E_TP_TOO_LONG 16 // package was roasted
 
 // system time, timestamps and temperatures from sensors
 __attribute__((__unused__)) static unsigned int time = 0; // profile seconds
-__attribute__((__unused__)) static unsigned int temperatur = 25; // actual oven temp
-__attribute__((__unused__)) static unsigned int last_temperatur = 25; // last oven temp
+__attribute__((__unused__)) static unsigned int temperature = 25; // actual oven temp
+__attribute__((__unused__)) static unsigned int last_temperature = 25; // last oven temp
 __attribute__((__unused__)) static int actual_dt = 0; // actual difference from last to actual temperatur
 
 
@@ -77,11 +77,11 @@ void setup() {
 
 
 static void control_oven() {
-  if (temperatur < set_min && (!is_oven_heating)) {
+  if (temperature < set_min && (!is_oven_heating)) {
     is_oven_heating = true;
     Serial.println("Oven turned on");
   }
-  else if (temperatur > set_max && is_oven_heating) {
+  else if (temperature > set_max && is_oven_heating) {
     is_oven_heating = false;
     Serial.println("Oven turned off");
   }
@@ -97,9 +97,9 @@ static void set_temp(int min, int max, int dt_min, int dt_max) {
 
 
 static void get_temp() {
-  last_temperatur = temperatur;
-  temperatur = int(float(analogRead(2)) * 0.2929);
-  actual_dt = temperatur - last_temperatur;
+  last_temperature = temperature;
+  temperature = int(float(analogRead(2)) * 0.2929);
+  actual_dt = temperature - last_temperature;
 }
 
 
@@ -116,40 +116,41 @@ static void print_debug() {
   Serial.print("Time: ");
   Serial.print(time);
   Serial.print(", temperatur: ");
-  Serial.print(temperatur);
+  Serial.print(temperature);
   Serial.print(", last_temperatur: ");
-  Serial.print(last_temperatur);
+  Serial.print(last_temperature);
   Serial.print(", state: ");
   Serial.print(state);
   Serial.print(", Error: ");
   Serial.println(error_condition);
 }
 
-static boolean check_max_duration() {
+static void check_max_duration() {
   if (time > time_max) {
     error_condition |= E_TIME_MAX;
-    return false;
   }
 }
 
-static boolean check_Tl_duration() {
+static void check_Tl_duration() {
   if (time - Tl_time_start > Tp_duration) {
     error_condition |= E_TL_TOO_LONG;
-    return false;
   }
 }
 
-static boolean check_Tp_duration() {
+static void check_Tp_duration() {
   if (time - Tp_time_start > Tp_duration) {
     error_condition |= E_TP_TOO_LONG;
-    return false;
   }
 }
 
 static void set_start_state() {
+  led_on = false;
+  digitalWrite(13, LOW);
+  error_condition = 0;
   state = START_STATE;
   get_temp();
-  last_temperatur = temperatur;
+  last_temperature = temperature;
+  actual_dt = temperature - last_temperature;
   set_temp(Tp-5, Tp, 0, ramp_up_rate_max);
 }
 
@@ -207,7 +208,7 @@ static void set_error_state() {
 
 
 static void handle_start_state() {
-  if (temperatur > Ts_min) {
+  if (temperature > Ts_min) {
     Ts_min_time = time;
     set_preheat_state();
   }
@@ -215,7 +216,7 @@ static void handle_start_state() {
 
 
 static void handle_preheat_state() {
-  if (temperatur > Ts_max) {
+  if (temperature > Ts_max) {
     Ts_max_time = time;
     set_ramp_up_state();
   }
@@ -223,7 +224,7 @@ static void handle_preheat_state() {
 
 
 static void handle_ramp_up_state() {
-  if (temperatur > Tl) {
+  if (temperature > Tl) {
     Tl_time_start = time;
     set_tal_first_state();
   }
@@ -232,7 +233,7 @@ static void handle_ramp_up_state() {
 
 static void handle_tal_first_state() {
   check_Tl_duration();
-  if (temperatur > Tp - 5) {
+  if (temperature > Tp - 5) {
     Tp_time_start = time;
     set_peak_state();
   }
@@ -251,13 +252,13 @@ static void handle_peak_state() {
 
 static void handle_tal_second_state() {
   check_Tl_duration();
-  if (temperatur < Tl) {
+  if (temperature < Tl) {
     set_ramp_down_state();
   }
 }
 
 static void handle_ramp_down_state() {
-  if (temperatur < Ts_min) {
+  if (temperature < Ts_min) {
     set_end_state();
   }
 }
@@ -286,7 +287,7 @@ static void handle_error_state() {
   if (error_condition & E_TIME_MAX)
     Serial.println("Error: reflow process does take too long");
   if (error_condition & E_TL_TOO_LONG)
-    Serial.println("Error: temperatur above liquidus was too long");
+    Serial.println("Error: temperature above liquidus was too long");
   if (error_condition & E_TP_TOO_LONG)
     Serial.println("Error: peak temperature duration was too long");
 }