diff --git a/homeassistant/components/wallbox/const.py b/homeassistant/components/wallbox/const.py
index 5db279650c4..6caa3c070c8 100644
--- a/homeassistant/components/wallbox/const.py
+++ b/homeassistant/components/wallbox/const.py
@@ -4,7 +4,7 @@ from enum import StrEnum
 DOMAIN = "wallbox"
 UPDATE_INTERVAL = 30
 
-BIDIRECTIONAL_MODEL_PREFIXES = ["QSX"]
+BIDIRECTIONAL_MODEL_PREFIXES = ["QS"]
 
 CODE_KEY = "code"
 CONF_STATION = "station"
diff --git a/homeassistant/components/wallbox/number.py b/homeassistant/components/wallbox/number.py
index d53a842b916..13938626336 100644
--- a/homeassistant/components/wallbox/number.py
+++ b/homeassistant/components/wallbox/number.py
@@ -80,7 +80,7 @@ class WallboxNumber(WallboxEntity, NumberEntity):
         self._coordinator = coordinator
         self._attr_unique_id = f"{description.key}-{coordinator.data[CHARGER_DATA_KEY][CHARGER_SERIAL_NUMBER_KEY]}"
         self._is_bidirectional = (
-            coordinator.data[CHARGER_DATA_KEY][CHARGER_PART_NUMBER_KEY][0:3]
+            coordinator.data[CHARGER_DATA_KEY][CHARGER_PART_NUMBER_KEY][0:2]
             in BIDIRECTIONAL_MODEL_PREFIXES
         )