diff --git a/sw/controller/src/led.c b/sw/controller/src/led.c
index 7da761e..a93b3f9 100644
--- a/sw/controller/src/led.c
+++ b/sw/controller/src/led.c
@@ -9,11 +9,27 @@
 #define LED_CYCLE_TICKS_ON      (3)
 
 
+typedef enum {
+    ON,
+    OFF
+} led_state_e;
+
+typedef struct {
+    uint32_t timer;
+    led_state_e state;
+} error_cycle_t;
+
+
 static uint32_t timer = 0;
+static uint8_t error_cycle = 0;
 static uint32_t current_act_counter = 0;
 static volatile uint32_t next_act_counter = 0;
 static volatile bool cic_error = false;
 static volatile bool rtc_error = false;
+static const error_cycle_t error_codes[2][8] = {
+    { { 50, ON }, { 50, OFF }, { 5, ON }, { 0, OFF }, { 0, OFF }, { 0, OFF }, { 0, OFF }, { 100, OFF } },
+    { { 50, ON }, { 50, OFF }, { 5, ON }, { 20, OFF }, { 5, ON }, { 0, OFF }, { 0, OFF }, { 100, OFF } },
+};
 
 
 static void led_task_resume (void) {
@@ -44,7 +60,27 @@ static void led_process_act (void) {
 }
 
 static void led_process_errors (void) {
-    // TODO: implement error blink codes
+    if (timer > 0) {
+        timer -= 1;
+    } else {
+        uint8_t error_code = 0;
+        if (cic_error) {
+            error_code = 0;
+        } else if (rtc_error) {
+            error_code = 1;
+        }
+        error_cycle_t error = error_codes[error_code][error_cycle];
+        timer = error.timer;
+        if (error.state == ON) {
+            hw_gpio_set(GPIO_ID_LED);
+        } else {
+            hw_gpio_reset(GPIO_ID_LED);
+        }
+        error_cycle += 1;
+        if (error_cycle >= 8) {
+            error_cycle = 0;
+        }
+    }
 }
 
 
@@ -81,6 +117,7 @@ void led_task (void) {
         if (led_has_errors()) {
             led_process_errors();
         } else {
+            error_cycle = 0;
             led_process_act();
         }