diff --git a/src/components/floor-plan/modal/circuitTrestle/step/PowerConditionalSelect.jsx b/src/components/floor-plan/modal/circuitTrestle/step/PowerConditionalSelect.jsx
index 89aa30d7..b48ecffd 100644
--- a/src/components/floor-plan/modal/circuitTrestle/step/PowerConditionalSelect.jsx
+++ b/src/components/floor-plan/modal/circuitTrestle/step/PowerConditionalSelect.jsx
@@ -165,6 +165,15 @@ export default function PowerConditionalSelect(props) {
       return
     }
 
+    if (selectedRow.pcsSerParallelYn === 'Y' && selectedModels.length === 0 && selectedMaker.pcsMkrMultiType === PCS_MKR_MULTI_TYPE.SINGLE_P) {
+      swalFire({
+        title: getMessage('modal.module.pcs.error1'),
+        icon: 'warning',
+      })
+
+      return
+    }
+
     if (selectedMaker.pcsMkrMultiType === PCS_MKR_MULTI_TYPE.MULTI) {
       setSelectedModels([...selectedModels, { ...selectedRow, id: uuidv4() }])
     } else if (!selectedModels.find((m) => m.itemId === selectedRow.itemId)) {
@@ -174,6 +183,11 @@ export default function PowerConditionalSelect(props) {
   }
 
   const onRemoveSelectedModel = (model) => {
+    const tempModels = selectedModels.filter((m) => m.id !== model.id)
+    if (tempModels.length === 1 && tempModels[0].pcsSerParallelYn === 'Y') {
+      setSelectedModels([])
+      return
+    }
     setSelectedModels(selectedModels.filter((m) => m.id !== model.id))
   }
 
@@ -282,14 +296,6 @@ export default function PowerConditionalSelect(props) {
           </label>
         </div>
       </div>
-      {/* <div className="grid-btn-wrap">
-        <button className="btn-frame modal mr5" onClick={() => setTabNum(2)}>
-          {getMessage('modal.circuit.trestle.setting.circuit.allocation.auto')}
-        </button>
-        <button className="btn-frame modal act" onClick={() => setTabNum(tabNum + 1)}>
-          {getMessage('modal.circuit.trestle.setting.circuit.allocation.passivity')}
-        </button>
-      </div> */}
     </>
   )
 }