diff --git a/src/service/disinfection_ctl_service.cpp b/src/service/disinfection_ctl_service.cpp
index 6c4fa2f..67516cc 100644
--- a/src/service/disinfection_ctl_service.cpp
+++ b/src/service/disinfection_ctl_service.cpp
@@ -226,8 +226,14 @@ void DisinfectionCtrlService::initContext(DisinfectionContext& context,
       "Remaining time (s)\n"                    //
   );
 }
-static string formattimeS(int sec) { return fmt::format("{:0>2}:{:0>2}:{:0>2}", sec / 3600, sec % 3600 / 60, sec % 60); }
-void          DisinfectionCtrlService::dumpDisinfectionLogsToCSV(DisinfectionContext& context) {
+static string formattimeS(int sec) {
+  if (sec >= 0) {
+    return fmt::format("{:0>2}:{:0>2}:{:0>2}", sec / 3600, sec % 3600 / 60, sec % 60);
+  } else {
+    return fmt::format("--:--:--");
+  }
+}
+void DisinfectionCtrlService::dumpDisinfectionLogsToCSV(DisinfectionContext& context) {
   auto* sensors = &m_context.h2o2data.h2o2sensor_data[0];
   auto  ds      = m_deviceIoControlService;
   float dvalue  = 0;
@@ -236,25 +242,28 @@ void          DisinfectionCtrlService::dumpDisinfectionLogsToCSV(DisinfectionCon
   } else {
     dvalue = m_context.dvalue;
   }
+
+  int remaintime = getEstimatedRemainingTimeS();
+
   context.csvlogger->write(
       fmt::format("{},"           //
-                           "{},{},{},{},"  //
-                           // "{},{},{},{},"  //
-                           // "{},{},{},{},"  //
-                           "{:.2f},{:.2f},{:.2f},"  //
-                           "{},{},{},{},"           //
-                           // "{},{},{},{},"  //
-                           "{},"   //
-                           "{}\n"  //
-                           ,
-                           getTime(),                                                                  //
-                           sensors[0].h2o2, sensors[0].temp, sensors[0].humid, sensors[0].saturation,  //
-                           // sensors[1].h2o2, sensors[1].temp, sensors[1].humid, sensors[1].saturation,                                          //
-                           // sensors[2].h2o2, sensors[2].temp, sensors[2].humid, sensors[2].saturation,                                          //
-                           dvalue, m_context.m_nowLoglevel, m_context.m_targetLoglevel,                                                        //
-                           ds->heatingStrip_getstate(), ds->airBlower_getstate(), ds->airCompressor_getstate(), ds->sprayLiquidPump_getGPM(),  //
-                           m_deviceIoControlService->getDisinfectantVolume_g(),                                                                //
-                           formattimeS(m_context.m_remaintime)));
+                  "{},{},{},{},"  //
+                  // "{},{},{},{},"  //
+                  // "{},{},{},{},"  //
+                  "{:.2f},{:.2f},{:.2f},"  //
+                  "{},{},{},{},"           //
+                  // "{},{},{},{},"  //
+                  "{},"   //
+                  "{}\n"  //
+                  ,
+                  getTime(),                                                                  //
+                  sensors[0].h2o2, sensors[0].temp, sensors[0].humid, sensors[0].saturation,  //
+                  // sensors[1].h2o2, sensors[1].temp, sensors[1].humid, sensors[1].saturation,                                          //
+                  // sensors[2].h2o2, sensors[2].temp, sensors[2].humid, sensors[2].saturation,                                          //
+                  dvalue, m_context.m_nowLoglevel, m_context.m_targetLoglevel,                                                        //
+                  ds->heatingStrip_getstate(), ds->airBlower_getstate(), ds->airCompressor_getstate(), ds->sprayLiquidPump_getGPM(),  //
+                  m_deviceIoControlService->getDisinfectantVolume_g(),                                                                //
+                  formattimeS(remaintime)));
 }
 
 void DisinfectionCtrlService::finishDisinfection(DisinfectionContext& context) {
@@ -322,7 +331,7 @@ void DisinfectionCtrlService::dumpDisinfectionLogs(DisinfectionContext& context)
       ds->heatingStrip_getstate(), ds->airBlower_getstate(), ds->airCompressor_getstate(), ds->sprayLiquidPump_getRPM(),       //
       ds->getPressureSensorData(1), ds->getPressureSensorData(2), ds->getPressureSensorData(3), ds->getPressureSensorData(4),  //
       m_deviceIoControlService->getDisinfectantVolume_g(),                                                                     //
-      m_context.m_remaintime);
+      getEstimatedRemainingTimeS());
 }
 
 /**
@@ -530,7 +539,11 @@ int32_t DisinfectionCtrlService::getEstimatedRemainingTimeS() {
   if (m_context.m_state == kpreheat) {
     return getPreHeatRaminTimeS();
   } else if (m_context.m_state == kdisinfection || m_context.m_state == kdisinfection_take_a_break) {
-    return m_context.m_remaintime;
+    if (m_context.dvalue > 0) {
+      return m_context.m_remaintime;
+    } else {
+      return -1;
+    }
   } else {
     return 0;
   }