diff --git a/src/controllers/tanksController.js b/src/controllers/tanksController.js
index 2ec8a8ff..1cbe11db 100644
--- a/src/controllers/tanksController.js
+++ b/src/controllers/tanksController.js
@@ -6215,33 +6215,53 @@ async function processIotData(hw_Id, data) {
       const waterLevel = parseInt(waterLevelHeight * waterCapacityPerCm, 10);
 
       console.log(`🚰 Tank [${tankhardwareId}] - Level: ${tankHeight}, Calculated Water Level: ${waterLevel}`);
-      if (tankHeight <= 0) {
-        const now = moment().tz('Asia/Kolkata');
+      const now = moment().tz('Asia/Kolkata');
+
+      // Log what we fetched from DB
+      console.log(`📥 Fetched Tank [${tankhardwareId}]`);
+      console.log("🔍 slave_status:", existingTank.slave_status);
+      console.log("🔍 slave_signal_lost_time:", existingTank.slave_signal_lost_time);
       
+      // ✅ Case 1: Tank is receiving data → set to "working"
+     
+      // 🚨 Case 2: Tank height is 0 — possible signal loss
+      if (tankHeight <= 0) {
         if (
           existingTank.slave_status !== "signal_lost1" &&
           existingTank.slave_status !== "not_working"
         ) {
-          // First time signal is lost
+          // First time signal lost
           existingTank.slave_status = "signal_lost1";
       
-          // Only set signal lost time if it doesn't exist
+          // Only set signal lost time if not already set
           if (!existingTank.slave_signal_lost_time) {
             existingTank.slave_signal_lost_time = now.format('DD-MMM-YYYY - HH:mm:ss');
-            console.log(`⚠️ Signal lost for tank [${tankhardwareId}] at ${existingTank.slave_signal_lost_time}`);
+            console.log(`⚠️ Signal lost DETECTED for tank [${tankhardwareId}] at ${existingTank.slave_signal_lost_time}`);
+          } else {
+            console.log(`⚠️ Signal lost ALREADY SET earlier for tank [${tankhardwareId}] at ${existingTank.slave_signal_lost_time}`);
           }
       
+          console.log("💾 Saving signal_lost1...");
           await existingTank.save();
+          return; // ⛔ STOP further processing on this cycle
       
         } else if (existingTank.slave_status === "signal_lost1") {
+          if (!existingTank.slave_signal_lost_time) {
+            console.log(`❗ ERROR: slave_status is signal_lost1 but no slave_signal_lost_time set.`);
+            return;
+          }
+      
           const lostTime = moment(existingTank.slave_signal_lost_time, 'DD-MMM-YYYY - HH:mm:ss');
           const minutesElapsed = now.diff(lostTime, 'minutes');
+          console.log(`⏳ Time since signal lost for tank [${tankhardwareId}]: ${minutesElapsed} minutes`);
       
           if (minutesElapsed >= 15) {
             existingTank.slave_status = "not_working";
             existingTank.slave_disconnected_time = now.format('DD-MMM-YYYY - HH:mm:ss');
+            console.log(`❌ Signal lost exceeded 15 minutes. Marking tank [${tankhardwareId}] as not_working.`);
             await existingTank.save();
       
+            // 🔁 Propagate to connected output tanks
             for (const outputConnection of existingTank.connections.outputConnections) {
               const linkedTank = await Tank.findOne({
                 customerId,
@@ -6254,23 +6274,24 @@ async function processIotData(hw_Id, data) {
                   if (inputConnection.inputConnections === tank_name) {
                     inputConnection.slave_status = "not_working";
                     await linkedTank.save();
+                    console.log(`🔗 Updated linked tank [${linkedTank.tankName}] inputConnection slave_status to not_working`);
                   }
                 }
               }
             }
       
-            console.log(`❌ Slave marked as not_working for tank [${tankhardwareId}] at ${existingTank.slave_disconnected_time}`);
+            console.log(`✅ Finalized: Tank [${tankhardwareId}] marked not_working at ${existingTank.slave_disconnected_time}`);
           } else {
-            console.log(`⏳ Still waiting... only ${minutesElapsed} minutes passed for tank [${tankhardwareId}]`);
+            console.log(`⏱ Still within grace period. ${15 - minutesElapsed} minutes left for tank [${tankhardwareId}]`);
           }
+      
         } else {
-          console.log(`⏩ Already in ${existingTank.slave_status}, no update.`);
+          console.log(`⏩ No action: Tank [${tankhardwareId}] already ${existingTank.slave_status}`);
         }
       }
       
       
       
-      
 
       if (tankHeight > 0 && waterLevel >= 0) {
         existingTank.waterlevel = waterLevel;