diff --git a/homeassistant/components/modbus/climate.py b/homeassistant/components/modbus/climate.py
index 71c01d20205..637478fffd4 100644
--- a/homeassistant/components/modbus/climate.py
+++ b/homeassistant/components/modbus/climate.py
@@ -97,7 +97,12 @@ async def async_setup_platform(
 class ModbusThermostat(BaseStructPlatform, RestoreEntity, ClimateEntity):
     """Representation of a Modbus Thermostat."""
 
-    _attr_supported_features = ClimateEntityFeature.TARGET_TEMPERATURE
+    _attr_supported_features = (
+        ClimateEntityFeature.TARGET_TEMPERATURE
+        | ClimateEntityFeature.TURN_OFF
+        | ClimateEntityFeature.TURN_ON
+    )
+    _enable_turn_on_off_backwards_compatibility = False
 
     def __init__(
         self,