diff --git a/src/ATBAPP/DeviceControllerDiag.cpp b/src/ATBAPP/DeviceControllerDiag.cpp
index d57522c..11ab664 100644
--- a/src/ATBAPP/DeviceControllerDiag.cpp
+++ b/src/ATBAPP/DeviceControllerDiag.cpp
@@ -45,6 +45,7 @@ void DeviceControllerDiag::init(hwinf *hw, DBusControllerInterface *dbus, QObjec
 void DeviceControllerDiag::diagReInit()
 {
     this->machineEventSet.clear();
+    this->previousMachineEventSet.clear();
     this->_isErrorState = false;
 }
 
@@ -61,7 +62,6 @@ void DeviceControllerDiag::diagRequest()
         qCritical() << "DeviceControllerDiag::diagRequest() is already running";
         return;
     }
-    this->machineEventSet.clear();
     this->isRequestRunning = true;
     this->diagRequestTimeoutTimer->start();