diff --git a/src/ATBAPP/DeviceControllerDiag.cpp b/src/ATBAPP/DeviceControllerDiag.cpp
index 11ab664..be93ab3 100644
--- a/src/ATBAPP/DeviceControllerDiag.cpp
+++ b/src/ATBAPP/DeviceControllerDiag.cpp
@@ -139,6 +139,8 @@ void DeviceControllerDiag::private_startDiag()
 
     if (result) {
         qCritical() << "DeviceControllerDiag::private_startDiag() DCdata is valid";
+        this->machineEventSet.remove(DCMachineEvent(DeviceController::State::E255));
+        this->machineEventSet.remove(DCMachineEvent(DeviceController::State::W255));
         QTimer::singleShot(200, this, &DeviceControllerDiag::sys_superviseSystem);
     }
     else {