diff --git a/src/energyplus/ForwardTranslator/ForwardTranslatePlantEquipmentOperationSchemes.cpp b/src/energyplus/ForwardTranslator/ForwardTranslatePlantEquipmentOperationSchemes.cpp
index 256a26b663..ec0667931b 100644
--- a/src/energyplus/ForwardTranslator/ForwardTranslatePlantEquipmentOperationSchemes.cpp
+++ b/src/energyplus/ForwardTranslator/ForwardTranslatePlantEquipmentOperationSchemes.cpp
@@ -174,13 +174,17 @@ namespace energyplus {
 
   boost::optional<Node> inletNode(const PlantLoop& plantLoop, const HVACComponent& component) {
     auto comps = plantLoop.supplyComponents(plantLoop.supplyInletNode(), component);
-    OS_ASSERT(comps.size() >= 2u);
+    if (comps.size() < 2u) {
+      return boost::none;
+    }
     return (comps.end() - 2u)->optionalCast<Node>();
   }
 
   boost::optional<Node> outletNode(const PlantLoop& plantLoop, const HVACComponent& component) {
     auto comps = plantLoop.supplyComponents(component, plantLoop.supplyOutletNode());
-    OS_ASSERT(comps.size() >= 2u);
+    if (comps.size() < 2u) {
+      return boost::none;
+    }
     return comps[1].optionalCast<Node>();
   }
 
@@ -437,7 +441,9 @@ namespace energyplus {
     for (const auto& comp : subsetCastVector<HVACComponent>(plantLoop.supplyComponents())) {
       if (!comp.optionalCast<Node>()) {
         if (_isSetpointComponent(plantLoop, comp)) {
-          result.push_back(operationSchemeComponent(comp));
+          // Keep comp as-is (not operationSchemeComponent(comp)): inletNode/outletNode/flowrate
+          // below need the component that's actually on the supply branch.
+          result.push_back(comp);
         }
       }
     }
@@ -543,16 +549,21 @@ namespace energyplus {
         }
 
         for (auto& setpointComponent : t_setpointComponents) {
+          // translationComponent may be a containing component (eg: HeatPumpAirToWater), used only
+          // for translation/naming below; setpointComponent stays the one on the supply branch for
+          // the inletNode/outletNode/flowrate/componentType lookups.
+          auto translationComponent = operationSchemeComponent(setpointComponent);
+
           // TODO: @kbenne, Find the right way to deal with this
           // For now, "dirty" (?) fix for Generator:MicroTurbine
 
           boost::optional<IdfObject> _idfObject;
 
-          if (boost::optional<GeneratorMicroTurbineHeatRecovery> mchpHR = setpointComponent.optionalCast<GeneratorMicroTurbineHeatRecovery>()) {
+          if (boost::optional<GeneratorMicroTurbineHeatRecovery> mchpHR = translationComponent.optionalCast<GeneratorMicroTurbineHeatRecovery>()) {
             GeneratorMicroTurbine mchp = mchpHR->generatorMicroTurbine();
             _idfObject = translateAndMapModelObject(mchp);
           } else {
-            _idfObject = translateAndMapModelObject(setpointComponent);
+            _idfObject = translateAndMapModelObject(translationComponent);
           }
 
           OS_ASSERT(_idfObject);
diff --git a/src/energyplus/Test/PlantEquipmentOperationSchemes_GTest.cpp b/src/energyplus/Test/PlantEquipmentOperationSchemes_GTest.cpp
index 98e47fee5e..564a03f468 100644
--- a/src/energyplus/Test/PlantEquipmentOperationSchemes_GTest.cpp
+++ b/src/energyplus/Test/PlantEquipmentOperationSchemes_GTest.cpp
@@ -40,6 +40,8 @@
 #include "../../model/GroundHeatExchangerHorizontalTrench.hpp"
 #include "../../model/GroundHeatExchangerVertical.hpp"
 #include "../../model/HeatExchangerFluidToFluid.hpp"
+#include "../../model/HeatPumpAirToWater.hpp"
+#include "../../model/HeatPumpAirToWaterHeating.hpp"
 #include "../../model/HeatPumpAirToWaterFuelFiredHeating.hpp"
 #include "../../model/HeatPumpAirToWaterFuelFiredCooling.hpp"
 #include "../../model/HeatPumpWaterToWaterEquationFitCooling.hpp"
@@ -522,6 +524,53 @@ TEST_F(EnergyPlusFixture, ForwardTranslator_PlantEquipmentOperationSchemes_Both_
   EXPECT_EQ("Dual", w_eg.getString(PlantEquipmentOperation_ComponentSetpointExtensibleFields::OperationType).get());
 }
 
+TEST_F(EnergyPlusFixture, ForwardTranslator_PlantEquipmentOperationSchemes_HeatPumpAirToWaterHeating_ComponentSetpoint) {
+  // Test for #5665 - segfault when a SetpointManager is on the outlet node of a
+  // HeatPumpAirToWaterHeating, since it isn't itself on the plant loop (its containing
+  // HeatPumpAirToWater is translated/named instead, but node lookups need the actual component)
+
+  Model m;
+
+  HeatPumpAirToWater awhp(m);
+  HeatPumpAirToWaterHeating awhp_hc(m);
+  ASSERT_TRUE(awhp.setHeatingOperationMode(awhp_hc));
+
+  PlantLoop hwLoop(m);
+  ASSERT_TRUE(hwLoop.addSupplyBranchForComponent(awhp_hc));
+
+  ScheduleConstant sch(m);
+  SetpointManagerScheduled spm(m, sch);
+  ASSERT_TRUE(awhp_hc.outletModelObject());
+  Node outletNode = awhp_hc.outletModelObject()->cast<Node>();
+  ASSERT_TRUE(spm.addToNode(outletNode));
+
+  ForwardTranslator ft;
+  Workspace w = ft.translateModel(m);
+
+  boost::optional<WorkspaceObject> _wo = w.getObjectByTypeAndName(IddObjectType::PlantLoop, hwLoop.name().get());
+  ASSERT_TRUE(_wo.is_initialized());
+  WorkspaceObject idf_loop = _wo.get();
+  WorkspaceObject idf_plant_op = idf_loop.getTarget(PlantLoopFields::PlantEquipmentOperationSchemeName).get();
+
+  // HeatPumpAirToWaterHeating is Heating type, so it also lands on the default HeatingLoad scheme
+  // in addition to the ComponentSetpoint one created because of the SetpointManager
+  ASSERT_EQ(2u, idf_plant_op.extensibleGroups().size());
+  auto w_eg = idf_plant_op.extensibleGroups()[1].cast<WorkspaceExtensibleGroup>();
+  ASSERT_EQ("PlantEquipmentOperation:ComponentSetpoint",
+            w_eg.getString(PlantEquipmentOperationSchemesExtensibleFields::ControlSchemeObjectType).get());
+
+  _wo = w_eg.getTarget(PlantEquipmentOperationSchemesExtensibleFields::ControlSchemeName);
+  ASSERT_TRUE(_wo.is_initialized());
+  WorkspaceObject idf_op_scheme = _wo.get();
+
+  ASSERT_EQ(1u, idf_op_scheme.extensibleGroups().size());
+  w_eg = idf_op_scheme.extensibleGroups()[0].cast<WorkspaceExtensibleGroup>();
+  EXPECT_EQ("HeatPump:AirToWater", w_eg.getString(PlantEquipmentOperation_ComponentSetpointExtensibleFields::EquipmentObjectType).get());
+  EXPECT_EQ(awhp.nameString(), w_eg.getString(PlantEquipmentOperation_ComponentSetpointExtensibleFields::EquipmentName).get());
+  EXPECT_TRUE(w_eg.getString(PlantEquipmentOperation_ComponentSetpointExtensibleFields::DemandCalculationNodeName));
+  EXPECT_TRUE(w_eg.getString(PlantEquipmentOperation_ComponentSetpointExtensibleFields::SetpointNodeName));
+}
+
 TEST_F(EnergyPlusFixture, ForwardTranslator_PlantEquipmentOperationSchemes_HeatPumpPlantLoopEIR) {
   Model m;