diff --git a/apps/ui/templates/dashboard.html b/apps/ui/templates/dashboard.html
index 92a0c34..2307271 100644
--- a/apps/ui/templates/dashboard.html
+++ b/apps/ui/templates/dashboard.html
@@ -358,27 +358,6 @@
             color: #999;
         }
         
-        .mode-display {
-            background: #f8f9fa;
-            border-radius: 8px;
-            padding: 0.75rem;
-            text-align: center;
-            margin-bottom: 1rem;
-        }
-        
-        .mode-label {
-            font-size: 0.75rem;
-            color: #666;
-            text-transform: uppercase;
-        }
-        
-        .mode-value {
-            font-size: 1rem;
-            font-weight: 600;
-            color: #667eea;
-            text-transform: uppercase;
-        }
-        
         .temp-controls {
             display: flex;
             gap: 0.5rem;
@@ -568,11 +547,6 @@
                             </div>
                         </div>
                         
-                        <div class="mode-display">
-                            <div class="mode-label">Modus</div>
-                            <div class="mode-value" id="state-{{ device.device_id }}-mode">OFF</div>
-                        </div>
-                        
                         <div class="temp-controls">
                             <button class="temp-button" onclick="adjustTarget('{{ device.device_id }}', -1.0)">
                                 -1.0
@@ -707,7 +681,6 @@
         let eventSource = null;
         let currentState = {};
         let thermostatTargets = {};
-        let thermostatModes = {};
         
         // Initialize device states
         {% for room in rooms %}
@@ -716,7 +689,6 @@
         currentState['{{ device.device_id }}'] = 'off';
         {% elif device.type == "thermostat" %}
         thermostatTargets['{{ device.device_id }}'] = 21.0;
-        thermostatModes['{{ device.device_id }}'] = 'off';
         {% endif %}
         {% endfor %}
         {% endfor %}
@@ -792,11 +764,10 @@
         // Adjust thermostat target temperature
         async function adjustTarget(deviceId, delta) {
             const currentTarget = thermostatTargets[deviceId] || 21.0;
-            const currentMode = thermostatModes[deviceId] || 'off';
             const newTarget = Math.max(5.0, Math.min(30.0, currentTarget + delta));
             
             try {
-                const response = await fetch(api(`/devices/${deviceId}/set`), {
+                const response = await fetch('/api/device/set', {
                     method: 'POST',
                     headers: {
                         'Content-Type': 'application/json'
@@ -804,7 +775,6 @@
                     body: JSON.stringify({
                         type: 'thermostat',
                         payload: {
-                            mode: currentMode,
                             target: newTarget
                         }
                     })
@@ -869,7 +839,6 @@
         function updateThermostatUI(deviceId, current, target, mode) {
             const currentSpan = document.getElementById(`state-${deviceId}-current`);
             const targetSpan = document.getElementById(`state-${deviceId}-target`);
-            const modeSpan = document.getElementById(`state-${deviceId}-mode`);
             
             if (current !== undefined && currentSpan) {
                 currentSpan.textContent = current.toFixed(1);
@@ -881,13 +850,6 @@
                 }
                 thermostatTargets[deviceId] = target;
             }
-            
-            if (mode !== undefined) {
-                if (modeSpan) {
-                    modeSpan.textContent = mode.toUpperCase();
-                }
-                thermostatModes[deviceId] = mode;
-            }
         }
         
         // Add event to list
@@ -945,18 +907,14 @@
                 }
                 
                 // Check if it's a thermostat
-                if (data.payload.mode !== undefined || data.payload.target !== undefined || data.payload.current !== undefined) {
-                    if (data.payload.mode !== undefined) {
-                        thermostatModes[data.device_id] = data.payload.mode;
-                    }
+                if (data.payload.target !== undefined || data.payload.current !== undefined) {
                     if (data.payload.target !== undefined) {
                         thermostatTargets[data.device_id] = data.payload.target;
                     }
                     updateThermostatUI(
                         data.device_id,
                         data.payload.current,
-                        data.payload.target,
-                        data.payload.mode
+                        data.payload.target
                     );
                 }
             }
@@ -1073,11 +1031,10 @@
                         // It's a light
                         currentState[deviceId] = state.power;
                         updateDeviceUI(deviceId, state.power, state.brightness);
-                    } else if (state.mode !== undefined || state.target !== undefined) {
+                    } else if (state.target !== undefined) {
                         // It's a thermostat
-                        if (state.mode) thermostatModes[deviceId] = state.mode;
                         if (state.target) thermostatTargets[deviceId] = state.target;
-                        updateThermostatUI(deviceId, state.current, state.target, state.mode);
+                        updateThermostatUI(deviceId, state.current, state.target);
                     }
                 }
             } catch (error) {