diff --git a/homeassistant/components/adax/climate.py b/homeassistant/components/adax/climate.py
index 2ce8adc30d6..6b0adcb52cf 100644
--- a/homeassistant/components/adax/climate.py
+++ b/homeassistant/components/adax/climate.py
@@ -74,6 +74,7 @@ class AdaxDevice(ClimateEntity):
     )
     _attr_target_temperature_step = PRECISION_WHOLE
     _attr_temperature_unit = UnitOfTemperature.CELSIUS
+    _enable_turn_on_off_backwards_compatibility = False
 
     def __init__(self, heater_data: dict[str, Any], adax_data_handler: Adax) -> None:
         """Initialize the heater."""