diff --git a/Control/firmware/HendiCtrl/main.c b/Control/firmware/HendiCtrl/main.c
index ddc191c..aed4572 100755
--- a/Control/firmware/HendiCtrl/main.c
+++ b/Control/firmware/HendiCtrl/main.c
@@ -180,6 +180,10 @@ int main(void)
 										setPower(arg);
 										PRINT_ANSWER("OK:%04u", g_poti_out_digits);
 									}
+									else
+									{
+										PRINT_ANSWER("INVALID STATE");
+									}
 								}
 							}
 
@@ -205,6 +209,10 @@ int main(void)
 										setSwitch(arg);
 										PRINT_ANSWER("OK:%u", g_switch_out);
 									}
+									else
+									{
+										PRINT_ANSWER("INVALID STATE");
+									}
 								}
 							}