diff --git a/src/EnergyPlus/PlantLoopHeatPumpEIR.cc b/src/EnergyPlus/PlantLoopHeatPumpEIR.cc
index 82b60c44e8c..5b9402801a6 100644
--- a/src/EnergyPlus/PlantLoopHeatPumpEIR.cc
+++ b/src/EnergyPlus/PlantLoopHeatPumpEIR.cc
@@ -1221,7 +1221,7 @@ void EIRPlantLoopHeatPump::processInputForEIRPLHP(EnergyPlusData &state)
 
 void EIRPlantLoopHeatPump::checkConcurrentOperation(EnergyPlusData &state)
 {
-    // This will do a recurring warning for concurrent companion operation.
+    // This will do a severe error for concurrent companion operation.
     // This function should be called at the end of the time-step to ensure any iteration-level operation
     //  is worked out and the results are final.
     // This function does not try to be intelligent about only reporting for one of the companions.  The only
@@ -1234,9 +1234,22 @@ void EIRPlantLoopHeatPump::checkConcurrentOperation(EnergyPlusData &state)
             continue;
         }
         if (thisPLHP.running && thisPLHP.companionHeatPumpCoil->running) {
-            ShowRecurringWarningErrorAtEnd(state,
-                                           "Companion heat pump objects running concurrently, check operation.  Base object name: " + thisPLHP.name,
-                                           thisPLHP.recurringConcurrentOperationWarningIndex);
+            ShowSevereError(state, "Concurrent plant loop heat pump companion operation.");
+            ShowContinueErrorTimeStamp(state, "");
+            ShowContinueError(state, "PLHP name= " + thisPLHP.name);
+            ShowContinueError(state, format("PLHP source side inlet temperature= {:.2R} [C]", thisPLHP.sourceSideInletTemp));
+            ShowContinueError(state, format("PLHP source side outlet temperature= {:.2R} [C]", thisPLHP.sourceSideOutletTemp));
+            ShowContinueError(state, format("PLHP source side heat transfer rate= {:.2R} [W]", thisPLHP.sourceSideHeatTransfer));
+            ShowContinueError(state, "PLHP companion coil name= " + thisPLHP.companionHeatPumpCoil->name);
+            ShowContinueError(
+                state, format("PLHP companion coil source side inlet temperature= {:.2R} [C]", thisPLHP.companionHeatPumpCoil->sourceSideInletTemp));
+            ShowContinueError(
+                state,
+                format("PLHP companion coil source side outlet temperature= {:.2R} [C]", thisPLHP.companionHeatPumpCoil->sourceSideOutletTemp));
+            ShowContinueError(
+                state,
+                format("PLHP companion coil source side heat transfer rate= {:.2R} [W]", thisPLHP.companionHeatPumpCoil->sourceSideHeatTransfer));
+            ShowFatalError(state, "CheckConcurrentOperation: Simulation terminated because of problems in plant loop heat pump operation");
         }
     }
 }
diff --git a/tst/EnergyPlus/unit/PlantLoopHeatPumpEIR.unit.cc b/tst/EnergyPlus/unit/PlantLoopHeatPumpEIR.unit.cc
index 3224508bc89..9543109a017 100644
--- a/tst/EnergyPlus/unit/PlantLoopHeatPumpEIR.unit.cc
+++ b/tst/EnergyPlus/unit/PlantLoopHeatPumpEIR.unit.cc
@@ -1740,15 +1740,8 @@ TEST_F(EnergyPlusFixture, TestConcurrentOperationChecking)
     coil3->running = true;
     coil4->running = true;
 
-    // check to warn about concurrent operation
-    EIRPlantLoopHeatPump::checkConcurrentOperation(*state);
-
-    // that will just add a recurring warning to the end, so to check whether
-    //  a warning was actually made, I'll just check the warning index values
-    ASSERT_EQ(0, coil1->recurringConcurrentOperationWarningIndex);
-    ASSERT_EQ(0, coil2->recurringConcurrentOperationWarningIndex);
-    ASSERT_EQ(1, coil3->recurringConcurrentOperationWarningIndex);
-    ASSERT_EQ(1, coil4->recurringConcurrentOperationWarningIndex);
+    // check fatal error about concurrent operation
+    EXPECT_THROW(EIRPlantLoopHeatPump::checkConcurrentOperation(*state), std::runtime_error);
 }
 
 TEST_F(EnergyPlusFixture, ConstructionFullObjectsHeatingAndCooling_AirSource)