diff --git a/homeassistant/components/smarttub/climate.py b/homeassistant/components/smarttub/climate.py
index 9f1802e7327..4921fca022d 100644
--- a/homeassistant/components/smarttub/climate.py
+++ b/homeassistant/components/smarttub/climate.py
@@ -67,6 +67,7 @@ class SmartTubThermostat(SmartTubEntity, ClimateEntity):
     )
     _attr_temperature_unit = UnitOfTemperature.CELSIUS
     _attr_preset_modes = list(PRESET_MODES.values())
+    _enable_turn_on_off_backwards_compatibility = False
 
     def __init__(self, coordinator, spa):
         """Initialize the entity."""