diff --git a/src/controllers/installationController.js b/src/controllers/installationController.js
index 2ba7fee4..2e96010e 100644
--- a/src/controllers/installationController.js
+++ b/src/controllers/installationController.js
@@ -6791,9 +6791,29 @@ exports.getDisconnectedCustomerDetails = async (req, reply) => {
     // });
 
     const customerResults = customerDetails.map((customer) => {
-      const affectedHardwareSet = customerHardwareMap[customer.customerId] || new Set();
+      const customerId = customer.customerId;
+      const affectedHardwareSet = customerHardwareMap[customerId] || new Set();
       const affectedLowerSet = new Set([...affectedHardwareSet].map(id => id.toLowerCase().trim()));
     
+      // Filter only sensors that belong to this customer and are disconnected
+      const disconnectedSensorsForCustomer = disconnectedSensors.filter(sensor =>
+        sensor.customerId === customerId
+      );
+    
+      // Collect actual disconnected hardwareIds (only masters and slaves)
+      const uniqueDisconnectedHardwareIds = new Set();
+      for (const sensor of disconnectedSensorsForCustomer) {
+        if (
+          (sensor.type === 'master' || sensor.type === 'slave') &&
+          sensor.connected_status === 'disconnected'
+        ) {
+          const hw = sensor.tankhardwareId || sensor.hardwareId || sensor.connected_to;
+          if (hw) {
+            uniqueDisconnectedHardwareIds.add(hw.trim());
+          }
+        }
+      }
+    
       // Get all unresolved issues related to this customer's affected hardwareIds
       const customerIssues = unresolvedIssues.filter(issue => {
         const allIssueHardwareIds = [
@@ -6803,7 +6823,7 @@ exports.getDisconnectedCustomerDetails = async (req, reply) => {
         return allIssueHardwareIds.some(hw => affectedLowerSet.has(hw));
       });
     
-      // Get the latest lastTicketRaisedAt from the issues
+      // Get latest ticket raise timestamp
       const lastTicketRaisedAt = customerIssues.reduce((latest, issue) => {
         const issueTime = new Date(issue.lastTicketRaisedAt);
         if (!isNaN(issueTime)) {
@@ -6827,8 +6847,8 @@ exports.getDisconnectedCustomerDetails = async (req, reply) => {
         city: customer.profile?.city || "",
         latitude: customer.latitude,
         longitude: customer.longitude,
-        totalHardwareIdsCount: affectedHardwareSet.size,
-        hardwareIds: [...affectedHardwareSet],
+        totalHardwareIdsCount: uniqueDisconnectedHardwareIds.size,
+        hardwareIds: [...uniqueDisconnectedHardwareIds],
         lastTicketRaisedAt: lastTicketRaisedAt || null
       };
     });