diff --git a/utilities/at32f421_freertos_demo/src/TaskLoop.c b/utilities/at32f421_freertos_demo/src/TaskLoop.c
index b5d3ecb..e022ccc 100644
--- a/utilities/at32f421_freertos_demo/src/TaskLoop.c
+++ b/utilities/at32f421_freertos_demo/src/TaskLoop.c
@@ -201,6 +201,13 @@ void poll_green_led(void)
 
     static uint16_t _slow_tick = 0;
 
+    /*--- 线圈断开中 → 灭（黄灯快闪负责故障指示） ---*/
+    if (g_disconnect_active) {
+        LEDA_OFF;
+        _slow_tick = 0;
+        return;
+    }
+
     /*--- 自检阶段：慢闪 ---*/
     if (loop1_INI_LOOP || !g_loop_power_up_state || !g_loop_stable) {
         _slow_tick++;