diff --git a/data/index.html b/data/index.html
index 06002ff..5f29818 100644
--- a/data/index.html
+++ b/data/index.html
@@ -63,6 +63,10 @@ <h2 id="large-modal-header"></h2>
 			<p>Communication problem between ESP and STM</p>
 		</div>
 
+		<div id="param-success-bar" class="param-success-bar">
+			<p id="param-success-bar-text"></p>
+		</div>
+
 		<!-- 'Add CAN Mapping' modal -->
 		<div id="can-mapping-modal-overlay" class="modal-overlay">
 			<div id="can-mapping-modal-container" class="can-mapping-modal-container">
diff --git a/data/style.css b/data/style.css
index 9f9f0ef..b2d9717 100644
--- a/data/style.css
+++ b/data/style.css
@@ -656,3 +656,22 @@ input:checked + .slider:before {
 .communication-error-bar p {
     text-align: center;
 }
+
+.param-success-bar {
+    display: none;
+    padding: 15px;
+    background-color: #4caf50;
+    color: white;
+    z-index: 100;
+    margin: 0 auto;
+    position: relative;
+    width: 30%;
+    top: 0px;
+    clear: left;
+    height: 20px;
+    border-radius: 0px 0px 20px 20px;
+}
+
+.param-success-bar p {
+    text-align: center;
+}
diff --git a/data/ui.js b/data/ui.js
index 34a31ab..96bcdd8 100644
--- a/data/ui.js
+++ b/data/ui.js
@@ -134,6 +134,21 @@ var ui = {
 			}
 		});
 
+		// Pause auto-refresh while the user is editing a parameter field, resume when done
+		var paramsTable = document.getElementById('params');
+		paramsTable.addEventListener('focusin', function(event) {
+			if (event.target.tagName === 'INPUT' || event.target.tagName === 'SELECT') {
+				clearInterval(ui.autoRefreshHandle);
+			}
+		});
+		paramsTable.addEventListener('focusout', function(event) {
+			if (event.target.tagName === 'INPUT' || event.target.tagName === 'SELECT') {
+				if (document.getElementById('auto-reload-checkbox').checked) {
+					ui.autoRefreshHandle = setInterval(ui.refresh, 2000);
+				}
+			}
+		});
+
 		ui.updateTables();
 		plot.generateChart();
 		ui.parameterDatabaseCheckForUpdates();
@@ -142,6 +157,7 @@ var ui = {
 		settings.populateSettingsTab();
 		ui.populateFileList();
 		ui.refreshStatusBox();
+		ui.refreshMessagesBox();
 		ui.getNodeId();
 		ui.setAutoReload(true);
 	},
@@ -151,6 +167,7 @@ var ui = {
 	{
 		ui.updateTables();
 		ui.refreshStatusBox();
+		ui.refreshMessagesBox();
 	},
 
 	getNodeId: function() {
@@ -173,6 +190,9 @@ var ui = {
     {
         document.getElementById("nodeid").value = this.responseText.split(',')[0];
         document.getElementById("canspeed").value = this.responseText.split(',')[1];
+        inverter.getParamList(function() {
+            inverter.canMapping(ui.populateExistingCanMappingTable);
+        });
     }
 
     xmlhttp.open("GET", "/nodeid?id=" + document.getElementById("nodeid").value + "&canspeed=" + document.getElementById("canspeed").value, true);
@@ -257,7 +277,7 @@ var ui = {
 						if (param.enums[param.value])
 						{
 
-						    valInput = '<SELECT onchange="ui.showParamUpdateModal(\'' + name + '\', this.value)">';
+						    valInput = '<SELECT onchange="ui.sendParameterUpdate(\'' + name + '\', this.value)">';
 
 						    for (var idx in param.enums)
 						    {
@@ -281,8 +301,9 @@ var ui = {
 					}
 					else
 					{
+						var step = Number.isInteger(param.value) ? 1 : 0.04;
 						valInput = '<INPUT type="number" min="' + param.minimum + '" max="' + param.maximum +
-							'" step="0.05" value="' + param.value + '" onchange="ui.showParamUpdateModal(\'' + name + '\', this.value)"/>';
+							'" step="' + step + '" value="' + param.value + '" onchange="ui.sendParameterUpdate(\'' + name + '\', this.value)"/>';
 					}
 
 					if (param.i !== undefined)
@@ -403,6 +424,16 @@ var ui = {
 	hideCommunicationErrorBar: function() {
 		document.getElementById('communication-error-bar').style.display = 'none';
 	},
+
+	/** @brief Show green success bar with a message, then auto-hide after a delay */
+	showParamSuccessBar: function(message) {
+		document.getElementById('param-success-bar-text').textContent = message;
+		document.getElementById('param-success-bar').style.display = 'block';
+		clearTimeout(ui.paramSuccessBarTimer);
+		ui.paramSuccessBarTimer = setTimeout(function() {
+			document.getElementById('param-success-bar').style.display = 'none';
+		}, 2000);
+	},
 	/**
 	 * ~~~ DASHBOARD ~~~
 	 */
@@ -414,11 +445,6 @@ var ui = {
 		var statusDiv = document.getElementById('top-left');
 
 		var status = paramsCache.get('status');
-
-		if ( status == null ){
-			return;
-		}
-
 		var lasterr = paramsCache.get('lasterr');
 		var udc = paramsCache.get('udc');
 		var tmphs = paramsCache.get('tmphs');
@@ -429,51 +455,60 @@ var ui = {
 		var tbl = document.createElement('table');
 		var tbody = document.createElement('tbody');
 		// status
-		var tr = document.createElement('tr');
-		var td = document.createElement('td');
-		td.appendChild(document.createTextNode('Status'));
-		tr.appendChild(td);
-		td = document.createElement('td');
-		td.appendChild(document.createTextNode(status));
-		tr.appendChild(td);
-		tbody.appendChild(tr);
+		if (status != null) {
+			var tr = document.createElement('tr');
+			var td = document.createElement('td');
+			td.appendChild(document.createTextNode('Status'));
+			tr.appendChild(td);
+			td = document.createElement('td');
+			td.appendChild(document.createTextNode(status));
+			tr.appendChild(td);
+			tbody.appendChild(tr);
+		}
 		// opmode
-		tr = document.createElement('tr');
-	    td = document.createElement('td');
-		td.appendChild(document.createTextNode('Opmode'));
-		tr.appendChild(td);
-		td = document.createElement('td');
-		td.appendChild(document.createTextNode(opmode));
-		tr.appendChild(td);
-		tbody.appendChild(tr);
+		if (opmode != null) {
+			var tr = document.createElement('tr');
+			var td = document.createElement('td');
+			td.appendChild(document.createTextNode('Opmode'));
+			tr.appendChild(td);
+			td = document.createElement('td');
+			td.appendChild(document.createTextNode(opmode));
+			tr.appendChild(td);
+			tbody.appendChild(tr);
+		}
 		// lasterr
-		tr = document.createElement('tr');
-		td = document.createElement('td');
-		td.appendChild(document.createTextNode('Last error'));
-		tr.appendChild(td);
-		td = document.createElement('td');
-		td.appendChild(document.createTextNode(lasterr));
-		tr.appendChild(td);
-		tbody.appendChild(tr);
+		if (lasterr != null) {
+			var tr = document.createElement('tr');
+			var td = document.createElement('td');
+			td.appendChild(document.createTextNode('Last error'));
+			tr.appendChild(td);
+			td = document.createElement('td');
+			td.appendChild(document.createTextNode(lasterr));
+			tr.appendChild(td);
+			tbody.appendChild(tr);
+		}
 		// udc
-		tr = document.createElement('tr');
-		td = document.createElement('td');
-		td.appendChild(document.createTextNode('Battery voltage (udc)'));
-		tr.appendChild(td);
-		td = document.createElement('td');
-		td.appendChild(document.createTextNode(udc));
-		tr.appendChild(td);
-		tbody.appendChild(tr);
+		if (udc != null) {
+			var tr = document.createElement('tr');
+			var td = document.createElement('td');
+			td.appendChild(document.createTextNode('Battery voltage (udc)'));
+			tr.appendChild(td);
+			td = document.createElement('td');
+			td.appendChild(document.createTextNode(udc));
+			tr.appendChild(td);
+			tbody.appendChild(tr);
+		}
 		// tmphs
-		tr = document.createElement('tr');
-		td = document.createElement('td');
-		td.appendChild(document.createTextNode('Inverter temperature'));
-		tr.appendChild(td);
-		td = document.createElement('td');
-		td.appendChild(document.createTextNode(tmphs));
-		tr.appendChild(td);
-		tbody.appendChild(tr);
-
+		if (tmphs != null) {
+			var tr = document.createElement('tr');
+			var td = document.createElement('td');
+			td.appendChild(document.createTextNode('Inverter temperature'));
+			tr.appendChild(td);
+			td = document.createElement('td');
+			td.appendChild(document.createTextNode(tmphs));
+			tr.appendChild(td);
+			tbody.appendChild(tr);
+		}
 
 		tbl.appendChild(tbody);
 		statusDiv.appendChild(tbl);
@@ -590,13 +625,10 @@ var ui = {
 
 		xmlhttp.onload = function()
 		{
-			// Show popup reporting upload completion
-			modal.emptyModal('small');
-			modal.appendToModal('small', 'File upload complete');
-			modal.showModal('small');
 			// Refresh the list of files on the 'files' page
 			ui.populateFileList();
-			setTimeout(function() { modal.hideModal('small') }, 2000);
+			// Show non-intrusive success notification
+			ui.showParamSuccessBar('File upload complete');
 		}
 
 		xmlhttp.open("POST", "/edit");
@@ -815,19 +847,14 @@ var ui = {
      * ~~~ PARAMETERS ~~~
      */
 
-    /** @brief Show modal box with the result of parameter update */
-    showParamUpdateModal: async function(param, value)
+    /** @brief Send parameter update to inverter and show result in success bar */
+    sendParameterUpdate: function(param, value)
     {
     	var c = 'set ' + param + ' ' + value;
-    	modal.emptyModal('small');
-    	modal.showModal('small');
-    	modal.appendToModal('small', 'Setting ' + param + ' to ' + value + "<br>");
     	inverter.sendCmd(c, function(reply)
 		{
-			modal.appendToModal('small', reply);
+			ui.showParamSuccessBar(param + ' = ' + value + ' \u2014 ' + reply.trim());
 		});
-		await sleep(2000);
-		modal.hideModal('small');
     },
 
     /** @brief Show confirmation that params have been saved */
diff --git a/esp32-web-interface.ino b/esp32-web-interface.ino
index 2f67e3c..8516b2b 100644
--- a/esp32-web-interface.ino
+++ b/esp32-web-interface.ino
@@ -537,6 +537,13 @@ static void handleCommand() {
       server.send(200, "text/plain", "Start command failed");
     }
   }
+  else if (cmd == "errors") {
+    String errors = OICan::GetErrors();
+    if (errors.length() == 0)
+      server.send(200, "text/plain", "No errors");
+    else
+      server.send(200, "text/plain", errors);
+  }
   else {
     server.send(200, "text/plain", "Unknown command");
   }
diff --git a/src/oi_can.cpp b/src/oi_can.cpp
index 73f0450..b3a36d7 100644
--- a/src/oi_can.cpp
+++ b/src/oi_can.cpp
@@ -51,12 +51,15 @@
 #define SDO_INDEX_SERIAL      0x5000
 #define SDO_INDEX_STRINGS     0x5001
 #define SDO_INDEX_COMMANDS    0x5002
+#define SDO_INDEX_ERROR_NUM   0x5003
+#define SDO_INDEX_ERROR_TIME  0x5004
 #define SDO_CMD_SAVE          0
 #define SDO_CMD_LOAD          1
 #define SDO_CMD_RESET         2
 #define SDO_CMD_DEFAULTS      3
 #define SDO_CMD_START         4
 #define SDO_CMD_STOP          5
+#define MAX_ERROR_LOG_ENTRIES 100
 
 namespace OICan {
 
@@ -673,6 +676,90 @@ double GetValue(String name) {
   }
 }
 
+static String lookupEnum(const String& unitStr, uint32_t value) {
+  String searchKey = String(value) + "=";
+  int pos = -1;
+
+  if (unitStr.startsWith(searchKey)) {
+    pos = searchKey.length();
+  } else {
+    // Search for ",N=" or ", N=" pattern to avoid partial matches
+    int i = unitStr.indexOf("," + searchKey);
+    if (i >= 0) {
+      pos = i + 1 + searchKey.length();
+    } else {
+      i = unitStr.indexOf(", " + searchKey);
+      if (i >= 0)
+        pos = i + 2 + searchKey.length();
+    }
+  }
+
+  if (pos < 0)
+    return String(value);
+
+  int end = unitStr.indexOf(',', pos);
+  if (end < 0)
+    end = unitStr.length();
+
+  String name = unitStr.substring(pos, end);
+  name.trim();
+  return name.length() > 0 ? name : String(value);
+}
+
+String GetErrors() {
+  // Returns empty string when not IDLE (e.g. busy with firmware update) or when the device reports no errors
+  if (state != IDLE) return "";
+
+  twai_message_t rxframe;
+  String result;
+
+  JsonDocument doc;
+  JsonDocument filter;
+
+  File file = SPIFFS.open(jsonFileName, "r");
+  if (file) {
+    filter["lasterr"]["unit"] = true;
+    deserializeJson(doc, file, DeserializationOption::Filter(filter));
+    file.close();
+  }
+
+  String unitStr;
+  if (!doc["lasterr"]["unit"].isNull())
+    unitStr = doc["lasterr"]["unit"].as<String>();
+
+  for (uint8_t index = 0; index < MAX_ERROR_LOG_ENTRIES; index++) {
+    requestSdoElement(SDO_INDEX_ERROR_TIME, index);
+
+    if (twai_receive(&rxframe, pdMS_TO_TICKS(10)) != ESP_OK)
+      break;
+
+    if (rxframe.data[0] == SDO_ABORT)
+      break;
+
+    uint32_t errorTime;
+    memcpy(&errorTime, &rxframe.data[4], sizeof(errorTime));
+
+    if (errorTime == 0)
+      break;
+
+    requestSdoElement(SDO_INDEX_ERROR_NUM, index);
+
+    if (twai_receive(&rxframe, pdMS_TO_TICKS(10)) != ESP_OK)
+      break;
+
+    if (rxframe.data[0] == SDO_ABORT)
+      break;
+
+    uint32_t errorNum;
+    memcpy(&errorNum, &rxframe.data[4], sizeof(errorNum));
+    String errorName = lookupEnum(unitStr, errorNum);
+
+    result += "[" + String(errorTime) + "]: " + errorName + "\r\n";
+  }
+
+  return result;
+}
+
 int GetNodeId() {
   return _nodeId;
 }
diff --git a/src/oi_can.h b/src/oi_can.h
index 9036a12..5bbecad 100644
--- a/src/oi_can.h
+++ b/src/oi_can.h
@@ -36,6 +36,7 @@ double GetValue(String name);
 bool StartStop(int opmode);
 bool SaveToFlash();
 String StreamValues(String names, int samples);
+String GetErrors();
 int StartUpdate(String fileName);
 int GetCurrentUpdatePage();
 int GetNodeId();