diff --git a/src/EltakoThermostatAccessory.ts b/src/EltakoThermostatAccessory.ts
index d1a0fee..0697feb 100644
--- a/src/EltakoThermostatAccessory.ts
+++ b/src/EltakoThermostatAccessory.ts
@@ -61,8 +61,8 @@ export class EltakoThermostatAccessory implements IUpdatableAccessory {
   }
 
   async setCurrentHeatingCoolingState(value: CharacteristicValue) {
-    const command = value === this.platform.Characteristic.CurrentHeatingCoolingState.OFF ? 'off' : 'on';
-    await this.platform.miniSafe.sendGenericCommand(this.accessory.context.device.info.sid, command);
+    const operationMode = value === this.platform.Characteristic.CurrentHeatingCoolingState.OFF ? 'off' : 'on';
+    await this.platform.miniSafe.sendGenericCommandWithValue(this.accessory.context.device.info.sid, 'operation_mode', operationMode);
   }
 
   getTargetTemperature(): CharacteristicValue {
diff --git a/src/MiniSafe2Api.ts b/src/MiniSafe2Api.ts
index 0663e9f..40d5426 100644
--- a/src/MiniSafe2Api.ts
+++ b/src/MiniSafe2Api.ts
@@ -59,6 +59,23 @@ export class MiniSafe2Api {
     await axios.post(url, payload);
   }
 
+  async sendGenericCommandWithValue(sid: string, command: string, value: string) {
+
+    const payload =
+    {
+      XC_FNC: 'SendGenericCmd',
+      id: sid,
+      data:
+      {
+        cmd: `${command}`,
+        value: `${value}`,
+      },
+    };
+
+    const url = this.buildUrl('/cmd');
+    await axios.post(url, payload);
+  }
+
   buildUrl(route: string) {
 
     const separator = route.includes('?') ? '&' : '?';