diff --git a/prodScreen_buttonsTest.c b/prodScreen_buttonsTest.c
index 2fe2a74..03ed7ef 100644
--- a/prodScreen_buttonsTest.c
+++ b/prodScreen_buttonsTest.c
@@ -22,7 +22,7 @@ int launch_prod_screen_buttons(int argc, char *argv[]){
     SDL_Rect text_pos;
     SDL_Event event;
     int stop_menu_loop = 0;
-    int res = 2; // 2=FAIL
+    int res = EXIT_FAILURE;
     int render = 0;
     int time_left = time_left_FAIL;
     int prev_ms = 0;
@@ -195,7 +195,7 @@ int launch_prod_screen_buttons(int argc, char *argv[]){
 
     /* Print not touched buttons if time_left */
     if(!time_left){
-        res = 2;
+        res = ERROR_MANUAL_FAIL;
 
         printf("    Missing Keys: ");
         for (i = 0; i < NB_KEYS; i++){
diff --git a/prodScreen_displayTest.c b/prodScreen_displayTest.c
index a13ef29..1c9282e 100644
--- a/prodScreen_displayTest.c
+++ b/prodScreen_displayTest.c
@@ -9,7 +9,7 @@ int launch_prod_screen_display(int argc, char *argv[]){
     int stop_menu_loop = 0;
     int timeout = 31;
     int prev_ms = 0;
-    int res = ERROR_MANUAL_FAIL;
+    int res = EXIT_FAILURE;
 
     /*  Main loop */
     while (!stop_menu_loop && timeout)
diff --git a/prodScreen_failScreen.c b/prodScreen_failScreen.c
index 9793366..686bb4d 100644
--- a/prodScreen_failScreen.c
+++ b/prodScreen_failScreen.c
@@ -6,7 +6,7 @@ static int wait_event_loop(){
 
     SDL_Event event;
     int stop_menu_loop = 0;
-    int res = 0;
+    int res = EXIT_FAILURE;
  
     /// -------- Main loop ---------
     while (!stop_menu_loop)
diff --git a/prodScreen_ledTest.c b/prodScreen_ledTest.c
index 13c663d..f8f0540 100644
--- a/prodScreen_ledTest.c
+++ b/prodScreen_ledTest.c
@@ -5,7 +5,7 @@ static int wait_event_loop(){
 
     SDL_Event event;
     int stop_menu_loop = 0;
-    int res = 0;
+    int res = EXIT_FAILURE;
  
     /// -------- Main loop ---------
     while (!stop_menu_loop)
diff --git a/prodScreen_magnetTest.c b/prodScreen_magnetTest.c
index 5121239..43ee440 100644
--- a/prodScreen_magnetTest.c
+++ b/prodScreen_magnetTest.c
@@ -15,7 +15,7 @@ void handle_sigusr1(int sig)
 static int wait_event_loop(){
 
     SDL_Event event;
-    int res = 0;
+    int res = EXIT_FAILURE;
  
     /// -------- Main loop ---------
     while (!stop_menu_loop)
diff --git a/prodScreen_showImage.c b/prodScreen_showImage.c
index 4e30577..3bbc7b1 100644
--- a/prodScreen_showImage.c
+++ b/prodScreen_showImage.c
@@ -57,7 +57,7 @@ int launch_prod_screen_showImage(int argc, char *argv[]){
     SDL_Event event;
     SDL_Surface *text_surface = NULL;
     SDL_Rect text_pos;
-    int res = 0;
+    int res = EXIT_FAILURE;
     int stop_menu_loop = 0;
 
     /* Load Img */
diff --git a/prodScreen_speakerTest.c b/prodScreen_speakerTest.c
index 81949dc..f3c7dc6 100644
--- a/prodScreen_speakerTest.c
+++ b/prodScreen_speakerTest.c
@@ -6,7 +6,7 @@ static int wait_event_loop(){
 
     SDL_Event event;
     int stop_menu_loop = 0;
-    int res = 0;
+    int res = EXIT_FAILURE;
  
     /// -------- Main loop ---------
     while (!stop_menu_loop)
diff --git a/prodScreen_validation.c b/prodScreen_validation.c
index 459db61..8962719 100644
--- a/prodScreen_validation.c
+++ b/prodScreen_validation.c
@@ -6,7 +6,7 @@ static int wait_event_loop(){
 
     SDL_Event event;
     int stop_menu_loop = 0;
-    int res = 0;
+    int res = EXIT_FAILURE;
  
     /// -------- Main loop ---------
     while (!stop_menu_loop)
diff --git a/prodScreen_waitBattery.c b/prodScreen_waitBattery.c
index 1bbc46e..168099b 100644
--- a/prodScreen_waitBattery.c
+++ b/prodScreen_waitBattery.c
@@ -10,7 +10,7 @@
 static int is_battery_present(){
     char buf[10];
     FILE *fp;
-    int res = 0;
+    int res = EXIT_FAILURE;
 
     /* Read battery file */
     if ((fp = fopen(BATTERY_PRESENT_FILE, "r")) == NULL) {