diff --git a/include/sensor.hpp b/include/sensor.hpp
index a8321fd..7fa9300 100644
--- a/include/sensor.hpp
+++ b/include/sensor.hpp
@@ -48,6 +48,7 @@
     std::shared_ptr<sdbusplus::asio::dbus_interface> availableInterface;
     std::shared_ptr<sdbusplus::asio::dbus_interface> operationalInterface;
     double value = std::numeric_limits<double>::quiet_NaN();
+    double rawValue = std::numeric_limits<double>::quiet_NaN();
     bool overriddenState = false;
     bool internalSet = false;
     double hysteresisTrigger;
diff --git a/src/ADCSensor.cpp b/src/ADCSensor.cpp
index c3980e0..aa7b50e 100644
--- a/src/ADCSensor.cpp
+++ b/src/ADCSensor.cpp
@@ -79,6 +79,7 @@
     }
     association = objectServer.add_interface(
         "/xyz/openbmc_project/sensors/voltage/" + name, association::interface);
+
     setInitialProperties(conn);
 }
 
@@ -167,11 +168,9 @@
         // todo read scaling factors from configuration
         try
         {
-            double nvalue = std::stod(response);
-
-            nvalue = (nvalue / sensorScaleFactor) / scaleFactor;
+            rawValue = std::stod(response);
+            double nvalue = (rawValue / sensorScaleFactor) / scaleFactor;
             nvalue = std::round(nvalue * roundFactor) / roundFactor;
-
             updateValue(nvalue);
         }
         catch (std::invalid_argument&)
@@ -193,6 +192,7 @@
     int fd = open(path.c_str(), O_RDONLY);
     if (fd < 0)
     {
+        std::cerr << "adcsensor " << name << " failed to open " << path << "\n";
         return; // we're no longer valid
     }
     inputDev.assign(fd);
@@ -201,6 +201,14 @@
         std::shared_ptr<ADCSensor> self = weakRef.lock();
         if (ec == boost::asio::error::operation_aborted)
         {
+            if (self)
+            {
+                std::cerr << "adcsensor " << self->name << " read cancelled\n";
+            }
+            else
+            {
+                std::cerr << "adcsensor read cancelled no self\n";
+            }
             return; // we're being canceled
         }
 
@@ -208,6 +216,10 @@
         {
             self->setupRead();
         }
+        else
+        {
+            std::cerr << "adcsensor weakref no self\n";
+        }
     });
 }
 
diff --git a/src/CPUSensor.cpp b/src/CPUSensor.cpp
index d68e980..4377bf9 100644
--- a/src/CPUSensor.cpp
+++ b/src/CPUSensor.cpp
@@ -224,9 +224,9 @@
         try
         {
             std::getline(responseStream, response);
-            double nvalue = std::stod(response);
+            rawValue = std::stod(response);
             responseStream.clear();
-            nvalue /= CPUSensor::sensorScaleFactor;
+            double nvalue = rawValue / CPUSensor::sensorScaleFactor;
 
             if (show)
             {
diff --git a/src/HwmonTempSensor.cpp b/src/HwmonTempSensor.cpp
index 649ca68..35dc5f3 100644
--- a/src/HwmonTempSensor.cpp
+++ b/src/HwmonTempSensor.cpp
@@ -106,6 +106,8 @@
     if ((err == boost::system::errc::bad_file_descriptor) ||
         (err == boost::asio::error::misc_errors::not_found))
     {
+        std::cerr << "Hwmon temp sensor " << name << " removed " << path
+                  << "\n";
         return; // we're being destroyed
     }
     std::istream responseStream(&readBuf);
@@ -115,8 +117,8 @@
         std::getline(responseStream, response);
         try
         {
-            double nvalue = std::stod(response);
-            nvalue /= sensorScaleFactor;
+            rawValue = std::stod(response);
+            double nvalue = rawValue / sensorScaleFactor;
             updateValue(nvalue);
         }
         catch (const std::invalid_argument&)
@@ -134,6 +136,8 @@
     int fd = open(path.c_str(), O_RDONLY);
     if (fd < 0)
     {
+        std::cerr << "Hwmon temp sensor " << name << " not valid " << path
+                  << "\n";
         return; // we're no longer valid
     }
     inputDev.assign(fd);
@@ -143,6 +147,15 @@
         std::shared_ptr<HwmonTempSensor> self = weakRef.lock();
         if (ec == boost::asio::error::operation_aborted)
         {
+            if (self)
+            {
+                std::cerr << "Hwmon temp sensor " << self->name
+                          << " read cancelled " << self->path << "\n";
+            }
+            else
+            {
+                std::cerr << "Hwmon sensor read cancelled, no self\n";
+            }
             return; // we're being canceled
         }
         if (self)
diff --git a/src/IpmbSensor.cpp b/src/IpmbSensor.cpp
index bc9d842..a7c1e09 100644
--- a/src/IpmbSensor.cpp
+++ b/src/IpmbSensor.cpp
@@ -241,7 +241,6 @@
                 return false;
             }
             resp = data[0];
-
             return true;
         }
         case (ReadingFormat::byte3):
@@ -348,6 +347,18 @@
                     read();
                     return;
                 }
+                else
+                {
+                    // rawValue only used in debug logging
+                    // up to 5th byte in data are used to derive value
+                    size_t end = std::min(sizeof(uint64_t), data.size());
+                    uint64_t rawData = 0;
+                    for (size_t i = 0; i < end; i++)
+                    {
+                        reinterpret_cast<uint8_t*>(&rawData)[i] = data[i];
+                    }
+                    rawValue = static_cast<double>(rawData);
+                }
 
                 /* Adjust value as per scale and offset */
                 value = (value * scaleVal) + offsetVal;
diff --git a/src/PSUSensor.cpp b/src/PSUSensor.cpp
index 6b27207..f93846d 100644
--- a/src/PSUSensor.cpp
+++ b/src/PSUSensor.cpp
@@ -143,9 +143,9 @@
         try
         {
             std::getline(responseStream, response);
-            double nvalue = std::stod(response);
+            rawValue = std::stod(response);
             responseStream.clear();
-            nvalue /= sensorFactor;
+            double nvalue = rawValue / sensorFactor;
 
             updateValue(nvalue);
         }
diff --git a/src/TachSensor.cpp b/src/TachSensor.cpp
index ba3b0a1..acfe659 100644
--- a/src/TachSensor.cpp
+++ b/src/TachSensor.cpp
@@ -149,9 +149,9 @@
             try
             {
                 std::getline(responseStream, response);
-                double nvalue = std::stod(response);
+                rawValue = std::stod(response);
                 responseStream.clear();
-                updateValue(nvalue);
+                updateValue(rawValue);
             }
             catch (const std::invalid_argument&)
             {
diff --git a/src/Thresholds.cpp b/src/Thresholds.cpp
index 986d183..6aa077c 100644
--- a/src/Thresholds.cpp
+++ b/src/Thresholds.cpp
@@ -244,6 +244,7 @@
 static int cLoFalse = 0;
 static int cLoMidstate = 0;
 static int cDebugThrottle = 0;
+static constexpr int assertLogCount = 10;
 
 struct ChangeParam
 {
@@ -276,7 +277,12 @@
             if (value >= threshold.value)
             {
                 thresholdChanges.emplace_back(threshold, true, value);
-                ++cHiTrue;
+                if (++cHiTrue < assertLogCount)
+                {
+                    std::cerr << "Sensor " << sensor->name << " high threshold "
+                              << threshold.value << " assert: value " << value
+                              << " raw data " << sensor->rawValue << "\n";
+                }
             }
             else if (value < (threshold.value - sensor->hysteresisTrigger))
             {
@@ -293,7 +299,13 @@
             if (value <= threshold.value)
             {
                 thresholdChanges.emplace_back(threshold, true, value);
-                ++cLoTrue;
+                if (++cLoTrue < assertLogCount)
+                {
+                    std::cerr << "Sensor " << sensor->name << " low threshold "
+                              << threshold.value << " assert: value "
+                              << sensor->value << " raw data "
+                              << sensor->rawValue << "\n";
+                }
             }
             else if (value > (threshold.value + sensor->hysteresisTrigger))
             {