diff --git a/homeassistant/components/zha/strings.json b/homeassistant/components/zha/strings.json
index 8909af8a5ba..a4a53b3c1b4 100644
--- a/homeassistant/components/zha/strings.json
+++ b/homeassistant/components/zha/strings.json
@@ -328,7 +328,7 @@
         },
         "manufacturer": {
           "name": "Manufacturer",
-          "description": "Manufacturer code."
+          "description": "Manufacturer code. Use a value of \"-1\" to force no code to be set."
         }
       }
     },
diff --git a/homeassistant/components/zha/websocket_api.py b/homeassistant/components/zha/websocket_api.py
index 51941248f03..447aa5efd0f 100644
--- a/homeassistant/components/zha/websocket_api.py
+++ b/homeassistant/components/zha/websocket_api.py
@@ -161,7 +161,9 @@ SERVICE_SCHEMAS = {
             vol.Optional(ATTR_CLUSTER_TYPE, default=CLUSTER_TYPE_IN): cv.string,
             vol.Required(ATTR_ATTRIBUTE): vol.Any(cv.positive_int, str),
             vol.Required(ATTR_VALUE): vol.Any(int, cv.boolean, cv.string),
-            vol.Optional(ATTR_MANUFACTURER): cv.positive_int,
+            vol.Optional(ATTR_MANUFACTURER): vol.All(
+                vol.Coerce(int), vol.Range(min=-1)
+            ),
         }
     ),
     SERVICE_WARNING_DEVICE_SQUAWK: vol.Schema(
@@ -210,7 +212,9 @@ SERVICE_SCHEMAS = {
                 vol.Required(ATTR_COMMAND_TYPE): cv.string,
                 vol.Exclusive(ATTR_ARGS, "attrs_params"): _ensure_list_if_present,
                 vol.Exclusive(ATTR_PARAMS, "attrs_params"): dict,
-                vol.Optional(ATTR_MANUFACTURER): cv.positive_int,
+                vol.Optional(ATTR_MANUFACTURER): vol.All(
+                    vol.Coerce(int), vol.Range(min=-1)
+                ),
             }
         ),
         cv.deprecated(ATTR_ARGS),
@@ -223,7 +227,9 @@ SERVICE_SCHEMAS = {
             vol.Optional(ATTR_CLUSTER_TYPE, default=CLUSTER_TYPE_IN): cv.string,
             vol.Required(ATTR_COMMAND): cv.positive_int,
             vol.Optional(ATTR_ARGS, default=[]): cv.ensure_list,
-            vol.Optional(ATTR_MANUFACTURER): cv.positive_int,
+            vol.Optional(ATTR_MANUFACTURER): vol.All(
+                vol.Coerce(int), vol.Range(min=-1)
+            ),
         }
     ),
 }
@@ -819,8 +825,6 @@ async def websocket_read_zigbee_cluster_attributes(
     success = {}
     failure = {}
     if zha_device is not None:
-        if cluster_id >= MFG_CLUSTER_ID_START and manufacturer is None:
-            manufacturer = zha_device.manufacturer_code
         cluster = zha_device.async_get_cluster(
             endpoint_id, cluster_id, cluster_type=cluster_type
         )
@@ -1300,8 +1304,6 @@ def async_load_api(hass: HomeAssistant) -> None:
         zha_device = zha_gateway.get_device(ieee)
         response = None
         if zha_device is not None:
-            if cluster_id >= MFG_CLUSTER_ID_START and manufacturer is None:
-                manufacturer = zha_device.manufacturer_code
             response = await zha_device.write_zigbee_attribute(
                 endpoint_id,
                 cluster_id,