diff --git a/cmd/metal-api/internal/service/partition-service.go b/cmd/metal-api/internal/service/partition-service.go
index 61f77486..9eee4531 100644
--- a/cmd/metal-api/internal/service/partition-service.go
+++ b/cmd/metal-api/internal/service/partition-service.go
@@ -380,12 +380,14 @@ func (r *partitionResource) partitionCapacity(request *restful.Request, response
 
 func (r *partitionResource) calcPartitionCapacity(pcr *v1.PartitionCapacityRequest) ([]v1.PartitionCapacity, error) {
 	var (
-		ps metal.Partitions
-		ms metal.Machines
+		ps    metal.Partitions
+		ms    metal.Machines
+		allMs metal.Machines
 
 		pcs = map[string]*v1.PartitionCapacity{}
 
-		machineQuery = datastore.MachineSearchQuery{}
+		machineQuery    = datastore.MachineSearchQuery{}
+		allMachineQuery = datastore.MachineSearchQuery{}
 	)
 
 	if pcr != nil && pcr.ID != nil {
@@ -396,6 +398,7 @@ func (r *partitionResource) calcPartitionCapacity(pcr *v1.PartitionCapacityReque
 		ps = metal.Partitions{*p}
 
 		machineQuery.PartitionID = pcr.ID
+		allMachineQuery.PartitionID = pcr.ID
 	} else {
 		var err error
 		ps, err = r.ds.ListPartitions()
@@ -413,6 +416,12 @@ func (r *partitionResource) calcPartitionCapacity(pcr *v1.PartitionCapacityReque
 		return nil, err
 	}
 
+	// if filtered on partition get all without more filters for issues evaluation
+	err = r.ds.SearchMachines(&allMachineQuery, &allMs)
+	if err != nil {
+		return nil, err
+	}
+
 	ecs, err := r.ds.ListProvisioningEventContainers()
 	if err != nil {
 		return nil, fmt.Errorf("unable to fetch provisioning event containers: %w", err)
@@ -429,7 +438,7 @@ func (r *partitionResource) calcPartitionCapacity(pcr *v1.PartitionCapacityReque
 	}
 
 	machinesWithIssues, err := issues.Find(&issues.Config{
-		Machines:        ms,
+		Machines:        allMs,
 		EventContainers: ecs,
 		Omit:            []issues.Type{issues.TypeLastEventError},
 	})
diff --git a/cmd/metal-api/internal/service/partition-service_test.go b/cmd/metal-api/internal/service/partition-service_test.go
index bac50f5b..cbd2e510 100644
--- a/cmd/metal-api/internal/service/partition-service_test.go
+++ b/cmd/metal-api/internal/service/partition-service_test.go
@@ -310,6 +310,27 @@ func TestPartitionCapacity(t *testing.T) {
 			mock.On(r.DB("mockdb").Table("event")).Return(events, nil)
 			mock.On(r.DB("mockdb").Table("partition")).Return(partitions, nil)
 			mock.On(r.DB("mockdb").Table("size")).Return(sizes, nil)
+
+			//Filtered mocks
+			var filteredPartition []metal.Partition
+			for _, partition := range partitions {
+				if partition.ID == "partition-a" {
+					filteredPartition = append(filteredPartition, partition)
+				}
+			}
+			var filteredMachinesByPartition []metal.Machine
+			var filteredMachinesByPartitionBySize []metal.Machine
+			for _, machine := range ms {
+				if machine.PartitionID == "partition-a" {
+					filteredMachinesByPartition = append(filteredMachinesByPartition, machine)
+					if machine.SizeID == "size-a" {
+						filteredMachinesByPartitionBySize = append(filteredMachinesByPartitionBySize, machine)
+					}
+				}
+			}
+			mock.On(r.DB("mockdb").Table("partition").Get("partition-a")).Return(filteredPartition, nil)
+			mock.On(r.DB("mockdb").Table("machine").Filter(func(var_1 r.Term) r.Term { return var_1.Field("partitionid").Eq("partition-a") })).Return(filteredMachinesByPartition, nil)
+			mock.On(r.DB("mockdb").Table("machine").Filter(func(var_1 r.Term) r.Term { return var_1.Field("partitionid").Eq("partition-a") }).Filter(func(var_1 r.Term) r.Term { return var_1.Field("sizeid").Eq("size-a") })).Return(filteredMachinesByPartitionBySize, nil)
 		}
 
 		machineTpl = func(id, partition, size, project string) metal.Machine {
@@ -411,6 +432,92 @@ func TestPartitionCapacity(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "filter considers all machines",
+			pcr: &v1.PartitionCapacityRequest{
+				ID:   pointer.Pointer("partition-a"),
+				Size: pointer.Pointer("size-a"),
+			},
+			mockFn: func(mock *r.Mock) {
+				m1 := machineTpl("1", "partition-a", "size-a", "project-123")
+				m2 := machineTpl("2", "partition-a", "size-a", "project-123")
+				m3 := machineTpl("3", "partition-a", "size-a", "project-123")
+				m4 := machineTpl("4", "partition-a", "size-b", "project-123")
+				m4.IPMI.Address = "1.2.3.1"
+				m5 := machineTpl("5", "partition-b", "size-a", "project-123")
+				mockMachines(mock, metal.MachineLivelinessAlive, nil, m1, m2, m3, m4, m5)
+			},
+
+			want: []*v1.PartitionCapacity{
+				{
+					Common: v1.Common{
+						Identifiable: v1.Identifiable{ID: "partition-a"}, Describable: v1.Describable{Name: pointer.Pointer(""), Description: pointer.Pointer("")},
+					},
+					ServerCapacities: v1.ServerCapacities{
+						{
+							Size:           "size-a",
+							Total:          3,
+							PhonedHome:     3,
+							Faulty:         1,
+							Allocated:      3,
+							FaultyMachines: []string{"1"},
+						},
+					},
+				},
+			},
+		},
+		{
+			name: "non filter considers all machines",
+			pcr:  &v1.PartitionCapacityRequest{},
+			mockFn: func(mock *r.Mock) {
+				m1 := machineTpl("1", "partition-a", "size-a", "project-123")
+				m2 := machineTpl("2", "partition-a", "size-a", "project-123")
+				m3 := machineTpl("3", "partition-a", "size-a", "project-123")
+				m4 := machineTpl("4", "partition-a", "size-b", "project-123")
+				m4.IPMI.Address = "1.2.3.1"
+				m5 := machineTpl("5", "partition-b", "size-a", "project-123")
+				mockMachines(mock, metal.MachineLivelinessAlive, nil, m1, m2, m3, m4, m5)
+			},
+			want: []*v1.PartitionCapacity{
+				{
+					Common: v1.Common{
+						Identifiable: v1.Identifiable{ID: "partition-a"}, Describable: v1.Describable{Name: pointer.Pointer(""), Description: pointer.Pointer("")},
+					},
+					ServerCapacities: v1.ServerCapacities{
+						{
+							Size:           "size-a",
+							Total:          3,
+							PhonedHome:     3,
+							Faulty:         1,
+							Allocated:      3,
+							FaultyMachines: []string{"1"},
+						},
+						{
+							Size:           "size-b",
+							Total:          1,
+							PhonedHome:     1,
+							Faulty:         1,
+							Allocated:      1,
+							FaultyMachines: []string{"4"},
+						},
+					},
+				},
+				{
+					Common: v1.Common{
+						Identifiable: v1.Identifiable{ID: "partition-b"}, Describable: v1.Describable{Name: pointer.Pointer(""), Description: pointer.Pointer("")},
+					},
+					ServerCapacities: v1.ServerCapacities{
+						{
+							Size:       "size-a",
+							Total:      1,
+							PhonedHome: 1,
+							Faulty:     0,
+							Allocated:  1,
+						},
+					},
+				},
+			},
+		},
 		{
 			name: "one waiting machine",
 			mockFn: func(mock *r.Mock) {