diff --git a/homeassistant/components/radiotherm/icons.json b/homeassistant/components/radiotherm/icons.json
new file mode 100644
index 00000000000..be955c5dcf0
--- /dev/null
+++ b/homeassistant/components/radiotherm/icons.json
@@ -0,0 +1,12 @@
+{
+  "entity": {
+    "switch": {
+      "hold": {
+        "default": "mdi:timer-off",
+        "state": {
+          "on": "mdi:timer"
+        }
+      }
+    }
+  }
+}
diff --git a/homeassistant/components/radiotherm/switch.py b/homeassistant/components/radiotherm/switch.py
index 3b71baffec6..1f047a76201 100644
--- a/homeassistant/components/radiotherm/switch.py
+++ b/homeassistant/components/radiotherm/switch.py
@@ -35,11 +35,6 @@ class RadioThermHoldSwitch(RadioThermostatEntity, SwitchEntity):
         super().__init__(coordinator)
         self._attr_unique_id = f"{coordinator.init_data.mac}_hold"
 
-    @property
-    def icon(self) -> str:
-        """Return the icon for the switch."""
-        return "mdi:timer-off" if self.is_on else "mdi:timer"
-
     @callback
     def _process_data(self) -> None:
         """Update and validate the data from the thermostat."""