diff --git a/custom_components/idm_heatpump/const.py b/custom_components/idm_heatpump/const.py
index 295bac2..e8a7a01 100644
--- a/custom_components/idm_heatpump/const.py
+++ b/custom_components/idm_heatpump/const.py
@@ -15,6 +15,7 @@ class SensorFeatures(IntFlag):
     SET_ROOM_MODE = 16
     SET_BINARY = 32
     SET_SYSTEM_STATUS = 64
+    SET_CIRCUIT_MODE = 128
 
 
 class _CaseInsensitiveEnumMeta(EnumMeta):
@@ -225,6 +226,7 @@ def _missing_(cls, value) -> Any:
 SERVICE_SET_TEMPERATURE = "set_temperature"
 SERVICE_SET_HUMIDITY = "set_humidity"
 SERVICE_SET_ROOM_MODE = "set_room_mode"
+SERVICE_SET_CIRCUIT_MODE = "set_circuit_mode"
 SERVICE_SET_BINARY = "set_binary"
 SERVICE_SET_SYSTEM_STATUS = "set_system_status"
 
diff --git a/custom_components/idm_heatpump/sensor.py b/custom_components/idm_heatpump/sensor.py
index 5de16da..b8ab732 100644
--- a/custom_components/idm_heatpump/sensor.py
+++ b/custom_components/idm_heatpump/sensor.py
@@ -12,9 +12,11 @@
     SERVICE_SET_HUMIDITY,
     SERVICE_SET_POWER,
     SERVICE_SET_ROOM_MODE,
+    SERVICE_SET_CIRCUIT_MODE,
     SERVICE_SET_SYSTEM_STATUS,
     SERVICE_SET_TEMPERATURE,
     RoomMode,
+    CircuitMode,
     SensorFeatures,
     SystemStatus,
 )
@@ -254,6 +256,54 @@ async def handle_set_room_mode(call: ServiceCall):
         service_func=handle_set_room_mode,
     )
 
+    async def handle_set_circuit_mode(call: ServiceCall):
+        target = call.data.get("target")
+        entity = platform.entities[target]
+
+        if (
+            not isinstance(entity, IdmHeatpumpEntity)
+            or SensorFeatures.SET_CIRCUIT_MODE not in entity.supported_features
+        ):
+            raise HomeAssistantError(
+                f"Entity {entity.entity_id} does not support this service.",
+                translation_domain=DOMAIN,
+                translation_key="entity_not_supported",
+                translation_placeholders={
+                    "entity_id": entity.entity_id,
+                },
+            )
+
+        entity: IdmHeatpumpEntity[CircuitMode]
+
+        acknowledge = call.data.get("acknowledge_risk")
+        if acknowledge is not True:
+            raise HomeAssistantError(
+                f"Must acknowledge risk to call {SERVICE_SET_CIRCUIT_MODE}",
+                translation_domain=DOMAIN,
+                translation_key="risk_not_acknowledged",
+            )
+
+        raw_value = call.data.get("value")
+
+        value = CircuitMode[raw_value]
+
+        if value is None:
+            raise HomeAssistantError("invalid value: {value}")
+
+        LOGGER.debug(
+            "Calling %s with value %s on %s",
+            SERVICE_SET_CIRCUIT_MODE,
+            value,
+            entity.entity_id,
+        )
+        await entity.async_write_value(value)
+
+    hass.services.async_register(
+        domain=DOMAIN,
+        service=SERVICE_SET_CIRCUIT_MODE,
+        service_func=handle_set_circuit_mode,
+    )
+
     async def handle_set_system_status(call: ServiceCall):
         target = call.data.get("target")
         entity = platform.entities[target]
diff --git a/custom_components/idm_heatpump/sensor_addresses.py b/custom_components/idm_heatpump/sensor_addresses.py
index 1c0bb57..71f9fb6 100644
--- a/custom_components/idm_heatpump/sensor_addresses.py
+++ b/custom_components/idm_heatpump/sensor_addresses.py
@@ -369,6 +369,8 @@ def heating_circuit_sensors(circuit: HeatingCircuit) -> list[IdmSensorAddress]:
             enum=CircuitMode,
             address=1393 + offset,
             name=f"mode_circuit_{circuit_name}",
+            device_class=SensorDeviceClass.ENUM,
+            supported_features=SensorFeatures.SET_CIRCUIT_MODE,
         ),
         _FloatSensorAddress(
             address=1401 + offset * 2,
diff --git a/custom_components/idm_heatpump/services.yaml b/custom_components/idm_heatpump/services.yaml
index 4c2ce83..62e3a43 100644
--- a/custom_components/idm_heatpump/services.yaml
+++ b/custom_components/idm_heatpump/services.yaml
@@ -112,6 +112,33 @@ set_room_mode:
           value: true
           translation_key: acknowledge_set_value
 
+set_circuit_mode:
+  fields:
+    target:
+      required: true
+      selector:
+        entity:
+          integration: idm_heatpump
+          domain: sensor
+          device_class: enum
+    value:
+      required: true
+      selector:
+        select:
+          options:
+            - "off"
+            - timed
+            - normal
+            - eco
+            - manual_heat
+            - manual_cool
+          translation_key: circuit_mode_options
+    acknowledge_risk:
+      selector:
+        constant:
+          value: true
+          translation_key: acknowledge_set_value
+
 set_binary:
   fields:
     target:
diff --git a/custom_components/idm_heatpump/translations/de.json b/custom_components/idm_heatpump/translations/de.json
index 4191b7c..6d36117 100644
--- a/custom_components/idm_heatpump/translations/de.json
+++ b/custom_components/idm_heatpump/translations/de.json
@@ -188,6 +188,24 @@
                 }
             }
         },
+        "set_circuit_mode": {
+            "name": "Heizkreismodus setzen",
+            "description": "Sendet einen Wert vom Typ 'Heizkreismodus' an die Wärmepumpe.",
+            "fields": {
+                "target": {
+                    "name": "Ziel",
+                    "description": "Der Sensor für welchen der Wert gesendet werden soll."
+                },
+                "value": {
+                    "name": "Wert",
+                    "description": "Der Wert der gesendet werden soll."
+                },
+                "acknowledge_risk": {
+                    "name": "Bestätigung",
+                    "description": "Ich akzeptiere das Risiko"
+                }
+            }
+        },
         "set_binary": {
             "name": "An-/Aus-Wert setzen",
             "description": "Sendet einen Wert vom Typ 'An/Aus' an die Wärmepumpe.",
@@ -238,6 +256,16 @@
                 "comfort": "Komfort"
             }
         },
+        "circuit_mode_options": {
+            "options": {
+                "off": "Aus",
+                "timed": "Zeitprogramm",
+                "normal": "Normal",
+                "eco": "Eco",
+                "manual_heat": "Manuell Heizen",
+                "manual_cool": "Manuell Kühlen"
+            }
+        },
         "system_status_options": {
             "options": {
                 "standby": "Standby",
diff --git a/custom_components/idm_heatpump/translations/en.json b/custom_components/idm_heatpump/translations/en.json
index f885791..8d3f0c6 100644
--- a/custom_components/idm_heatpump/translations/en.json
+++ b/custom_components/idm_heatpump/translations/en.json
@@ -188,6 +188,24 @@
                 }
             }
         },
+        "set_circuit_mode": {
+            "name": "Set circuit mode value",
+            "description": "Sends a ciruict mode value to the heat pump.",
+            "fields": {
+                "target": {
+                    "name": "Target",
+                    "description": "The sensor for which to set the value."
+                },
+                "value": {
+                    "name": "Value",
+                    "description": "The value to send."
+                },
+                "acknowledge_risk": {
+                    "name": "Confirmation",
+                    "description": "I accept the risks"
+                }
+            }
+        },
         "set_binary": {
             "name": "Set on/off value",
             "description": "Set on/off value",
@@ -238,6 +256,16 @@
                 "comfort": "Comfort"
             }
         },
+        "circuit_mode_options": {
+            "options": {
+                "off": "Off",
+                "timed": "Timed",
+                "normal": "Normal",
+                "eco": "Eco",
+                "manual_heat": "Manual Heating",
+                "manual_cool": "Manual Cooling"
+            }
+        },
         "system_status_options": {
             "options": {
                 "standby": "Standby",