diff --git a/src/eez/modules/psu/conf_advanced.h b/src/eez/modules/psu/conf_advanced.h
index bd7da4ca1..d34b283c7 100644
--- a/src/eez/modules/psu/conf_advanced.h
+++ b/src/eez/modules/psu/conf_advanced.h
@@ -122,7 +122,7 @@
 #define CONF_SKIP_PWRGOOD_TEST 0
 
 /// Minimal temperature (in oC) for sensor to be declared as valid.
-#define TEMP_SENSOR_MIN_VALID_TEMPERATURE -55
+#define TEMP_SENSOR_MIN_VALID_TEMPERATURE 1
 #define TEMP_SENSOR_MAX_VALID_TEMPERATURE 125
 
 /// Interval at which fan speed should be adjusted
@@ -264,4 +264,4 @@
 #define CONF_LIST_COUNDOWN_DISPLAY_THRESHOLD 5 // 5 seconds
 #define CONF_RAMP_COUNDOWN_DISPLAY_THRESHOLD 5 // 5 seconds
 
-#define MAX_CALIBRATION_POINTS 20
\ No newline at end of file
+#define MAX_CALIBRATION_POINTS 20
diff --git a/src/eez/modules/psu/temp_sensor.cpp b/src/eez/modules/psu/temp_sensor.cpp
index 04a4ea019..9715283d4 100644
--- a/src/eez/modules/psu/temp_sensor.cpp
+++ b/src/eez/modules/psu/temp_sensor.cpp
@@ -26,6 +26,8 @@
 #include <eez/modules/aux_ps/fan.h>
 #endif
 
+#define CONF_DECLARE_TEMP_SENSOR_FAILED_THRESHOLD_MS 2000
+
 namespace eez {
 namespace psu {
 
@@ -43,7 +45,7 @@ TempSensor sensors[NUM_TEMP_SENSORS] = { TEMP_SENSORS };
 ////////////////////////////////////////////////////////////////////////////////
 
 TempSensor::TempSensor(Type type_, const char *name_, int ques_bit_, int scpi_error_)
-    : type(type_), name(name_), ques_bit(ques_bit_), scpi_error(scpi_error_) {
+    : type(type_), name(name_), ques_bit(ques_bit_), scpi_error(scpi_error_), m_timeOfFirstInvalidValue(0) {
 }
 
 bool TempSensor::isInstalled() {
@@ -95,31 +97,49 @@ float TempSensor::doRead() {
     return NAN;
 }
 
-bool TempSensor::test() {
-    if (isInstalled()) {
-        float temperature = doRead();
-        g_testResult = 
-            isNaN(temperature) || 
-            temperature < TEMP_SENSOR_MIN_VALID_TEMPERATURE || 
-            temperature > TEMP_SENSOR_MAX_VALID_TEMPERATURE ? TEST_FAILED : TEST_OK;
-    } else {
-        g_testResult = TEST_SKIPPED;
-    }
-
+void TempSensor::testTemperatureValidity(float value) {
     Channel *channel = getChannel();
 
-    if (g_testResult == TEST_FAILED) {
-        if (channel) {
-            // set channel current max. limit to ERR_MAX_CURRENT if sensor is faulty
-            channel->limitMaxCurrent(MAX_CURRENT_LIMIT_CAUSE_TEMPERATURE);
+    bool isTemperatureValueInvalid = isNaN(value) || value < TEMP_SENSOR_MIN_VALID_TEMPERATURE || value > TEMP_SENSOR_MAX_VALID_TEMPERATURE;
+    if (isTemperatureValueInvalid) {
+        if (g_testResult == TEST_OK) {
+            if (m_timeOfFirstInvalidValue != 0) {
+                int32_t diff = millis() - m_timeOfFirstInvalidValue;
+                if (diff > CONF_DECLARE_TEMP_SENSOR_FAILED_THRESHOLD_MS) {
+                    g_testResult = TEST_FAILED;
+
+                    if (channel) {
+                        // set channel current max. limit to ERR_MAX_CURRENT if sensor is faulty
+                        channel->limitMaxCurrent(MAX_CURRENT_LIMIT_CAUSE_TEMPERATURE);
+                    }
+
+                    generateError(scpi_error);
+                }
+            } else {
+                m_timeOfFirstInvalidValue = millis();
+                if (m_timeOfFirstInvalidValue == 0) {
+                    m_timeOfFirstInvalidValue = 1;
+                }
+            }
         }
-
-        generateError(scpi_error);
     } else {
+        g_testResult = TEST_OK;
+        m_timeOfFirstInvalidValue = 0;
+
         if (channel) {
             channel->unlimitMaxCurrent();
         }
     }
+}
+
+bool TempSensor::test() {
+    if (isInstalled()) {
+        g_testResult = TEST_OK;
+        float temperature = doRead();
+        testTemperatureValidity(temperature);
+    } else {
+        g_testResult = TEST_SKIPPED;
+    }
 
     return g_testResult != TEST_FAILED;
 }
@@ -131,17 +151,7 @@ float TempSensor::read() {
 
     float value = doRead();
 
-    if (isNaN(value) || value < TEMP_SENSOR_MIN_VALID_TEMPERATURE || value > TEMP_SENSOR_MAX_VALID_TEMPERATURE) {
-        g_testResult = TEST_FAILED;
-
-        Channel *channel = getChannel();
-        if (channel) {
-            // set channel current max. limit to ERR_MAX_CURRENT if sensor is faulty
-            channel->limitMaxCurrent(MAX_CURRENT_LIMIT_CAUSE_TEMPERATURE);
-        }
-
-        generateError(scpi_error);
-    }
+    testTemperatureValidity(value);
 
     return value;
 }
diff --git a/src/eez/modules/psu/temp_sensor.h b/src/eez/modules/psu/temp_sensor.h
index 7959dcd56..5ffda1a32 100644
--- a/src/eez/modules/psu/temp_sensor.h
+++ b/src/eez/modules/psu/temp_sensor.h
@@ -68,6 +68,9 @@ class TempSensor {
 
 private:
     float doRead();
+
+	uint32_t m_timeOfFirstInvalidValue;
+	void testTemperatureValidity(float value);
 };
 
 ////////////////////////////////////////////////////////////////////////////////