diff --git a/basis/windturbine_lib.lua b/basis/windturbine_lib.lua
index 31a30b6..5299bd6 100644
--- a/basis/windturbine_lib.lua
+++ b/basis/windturbine_lib.lua
@@ -20,6 +20,7 @@ local function chat_message(player_name, msg)
 	if player_name then
 		minetest.chat_send_player(player_name, S("[TA4 Wind Turbine]").." "..msg)
 	end
+	return false, msg
 end
 
 -- num_turbines is the mx number of valid wind turbines. In the case of a tool
@@ -29,20 +30,17 @@ function techage.valid_place_for_windturbine(pos, player_name, num_turbines)
 
 	-- Check if occean (only for tool)
 	if num_turbines == 0 and pos.y ~= 1 then
-		chat_message(player_name, S("This is not the surface of the ocean!"))
-		return false
+		return chat_message(player_name, S("This is not the surface of the ocean!"))
 	end
 	local node = minetest.get_node(pos)
 	if num_turbines == 0 and node.name ~= "default:water_source" then
-		chat_message(player_name, S("This is no ocean water!"))
-		return false
+		return chat_message(player_name, S("This is no ocean water!"))
 	end
 	local data = minetest.get_biome_data({x=pos.x, y=-2, z=pos.z})
 	if data then
 		local name = minetest.get_biome_name(data.biome)
 		if not string.find(name, "ocean") then
-			chat_message(player_name, S("This is a").." "..name.." "..S("biome and no ocean!"))
-			return false
+			return chat_message(player_name, S("This is a").." "..name.." "..S("biome and no ocean!"))
 		end
 	end
 	-- check the space over ocean
@@ -51,9 +49,8 @@ function techage.valid_place_for_windturbine(pos, player_name, num_turbines)
 	num = #minetest.find_nodes_in_area(pos1, pos2, {"air", "ignore"})
 	if num < (41 * 41 * 21 * 0.9) then
 		techage.mark_region(player_name, pos1, pos2, "")
-		chat_message(player_name, 
-				S("Here is not enough wind (A free air space of 41x41x21 m is necessary)!"))
-		return false
+		return chat_message(player_name, 
+				S("Here is not enough wind\n(A free air space of 41x41x21 m is necessary)!"))
 	end
 	-- Check for water surface (occean)
 	pos1 = {x=pos.x-20, y=1, z=pos.z-20}
@@ -63,8 +60,7 @@ function techage.valid_place_for_windturbine(pos, player_name, num_turbines)
 	
 	if num < (41*41 * 0.8) then
 		techage.mark_region(player_name, pos1, pos2, "")
-		chat_message(player_name, S("Here is not enough water (41x41 m)!"))
-		return false
+		return chat_message(player_name, S("Here is not enough water (41x41 m)!"))
 	end
 	-- Check for next wind turbine
 	pos1 = {x=pos.x-13, y=2, z=pos.z-13}
@@ -73,13 +69,12 @@ function techage.valid_place_for_windturbine(pos, player_name, num_turbines)
 	num = #minetest.find_nodes_in_area(pos1, pos2, {"techage:ta4_wind_turbine"})
 	if num > num_turbines then
 		techage.mark_region(player_name, pos1, pos2, "")
-		chat_message(player_name, S("The next wind turbines is too close!"))
-		return false
+		return chat_message(player_name, S("The next wind turbines is too close!"))
 	end
 	
 	if num_turbines == 0 then
 		chat_message(player_name,  minetest.pos_to_string(pos).." "..
 				S("is a suitable place for a wind turbine!"))
 	end
-	return true
+	return true, "ok"
 end
diff --git a/doc/manual_DE.lua b/doc/manual_DE.lua
index 02b9762..049aaa7 100644
--- a/doc/manual_DE.lua
+++ b/doc/manual_DE.lua
@@ -1147,7 +1147,9 @@ techage.manual_DE.aText = {
   "\n"..
   "\n",
   "Der Windkraftanlagenblock (Rotor) ist das Herzstück der Windkraftanlage. Dieser Block muss oben auf den Mast gesetzt werden. Idealerweise auf Y = 15\\, dann bleibst du noch gerade innerhalb eines Map-/Forceload-Blocks.\n"..
-  "Sofern alle Bedingungen erfüllt sind\\, erscheinen beim Setzen dieses Blocks auch automatisch die Rotorblätter (Flügel). Anderenfalls wird dir eine Fehlermeldung angezeigt.\n"..
+  "Nach dem Setzen des Blocks wird ein Check durchgeführt\\, ob alle Bedingungen für den Betrieb der Windkraftanlage erfüllt sind. Sofern alle Bedingungen erfüllt sind\\, erscheinen beim Setzen dieses Blocks auch automatisch die Rotorblätter (Flügel). Anderenfalls wird dir eine Fehlermeldung angezeigt. \n"..
+  "\n"..
+  "Durch Schlagen auf den Block kann der Check wiederholt werden.\n"..
   "\n"..
   "\n"..
   "\n",
diff --git a/doc/manual_EN.lua b/doc/manual_EN.lua
index c476712..378b5c6 100644
--- a/doc/manual_EN.lua
+++ b/doc/manual_EN.lua
@@ -1124,7 +1124,9 @@ techage.manual_EN.aText = {
   "\n"..
   "\n",
   "The wind turbine block (rotor) is the heart of the wind turbine. This block must be placed on top of the mast. Ideally at Y = 15\\, then you just stay within a map / forceload block.\n"..
-  "If all conditions are met\\, the rotor blades appear automatically when this block is set. Otherwise you will see an error message.\n"..
+  "After the block has been set\\, a check is carried out to determine whether all conditions for the operation of the wind turbine have been met. If all conditions are met\\, the rotor blades (wings) appear automatically when this block is set. Otherwise you will get an error message.\n"..
+  "\n"..
+  "The check can be repeated by hitting the block. \n"..
   "\n"..
   "\n"..
   "\n",
diff --git a/locale/techage.de.tr b/locale/techage.de.tr
index 5308539..cd02e1f 100644
--- a/locale/techage.de.tr
+++ b/locale/techage.de.tr
@@ -1050,7 +1050,7 @@ This is not the surface of the ocean!=Das ist nicht die Meeresoberfläche!
 This is no ocean water!= Dies ist kein Meerwasser!
 This is a=Dies ist ein
 biome and no ocean!=Biom und keine Meer (ocean)!
-Here is not enough wind (A free air space of 41x41x21 m is necessary)!=Hier ist nicht genug Wind (Ein freier Luftraum von 41x41x21 m ist notwendig)!
+Here is not enough wind@n(A free air space of 41x41x21 m is necessary)!=Hier ist nicht genug Wind@n(Ein freier Luftraum von 41x41x21 m ist notwendig)!
 Here is not enough water (41x41 m)!=Hier ist nicht genug Wasser (41x41 m)!
 The next wind turbines is too close!= Die nächste Windkraftanlagen iat zu nahe!
 is a suitable place for a wind turbine!=ist ein geeigneter Ort für eine Windkraftanlage!
diff --git a/manuals/manual_ta4_DE.md b/manuals/manual_ta4_DE.md
index 85a28ff..c2a8ae1 100644
--- a/manuals/manual_ta4_DE.md
+++ b/manuals/manual_ta4_DE.md
@@ -23,7 +23,9 @@ Die Windkraftanlage liefert eine Leistung von 70 ku, aber dies nur 8 Stunden am
 ### TA4 Windkraftanlage / Wind Turbine
 
 Der Windkraftanlagenblock (Rotor) ist das Herzstück der Windkraftanlage. Dieser Block muss oben auf den Mast gesetzt werden. Idealerweise auf Y = 15, dann bleibst du noch gerade innerhalb eines Map-/Forceload-Blocks.
-Sofern alle Bedingungen erfüllt sind, erscheinen beim Setzen dieses Blocks auch automatisch die Rotorblätter (Flügel). Anderenfalls wird dir eine Fehlermeldung angezeigt.
+Nach dem Setzen des Blocks wird ein Check durchgeführt, ob alle Bedingungen für den Betrieb der Windkraftanlage erfüllt sind. Sofern alle Bedingungen erfüllt sind, erscheinen beim Setzen dieses Blocks auch automatisch die Rotorblätter (Flügel). Anderenfalls wird dir eine Fehlermeldung angezeigt. 
+
+Durch Schlagen auf den Block kann der Check wiederholt werden.
 
 [ta4_windturbine|image]
 
diff --git a/manuals/manual_ta4_EN.md b/manuals/manual_ta4_EN.md
index 2ae9546..3ba1f2d 100644
--- a/manuals/manual_ta4_EN.md
+++ b/manuals/manual_ta4_EN.md
@@ -23,7 +23,9 @@ The wind turbine delivers 70 ku, but only 8 hours a day (see above).
 ### TA4 Wind Turbine
 
 The wind turbine block (rotor) is the heart of the wind turbine. This block must be placed on top of the mast. Ideally at Y = 15, then you just stay within a map / forceload block.
-If all conditions are met, the rotor blades appear automatically when this block is set. Otherwise you will see an error message.
+After the block has been set, a check is carried out to determine whether all conditions for the operation of the wind turbine have been met. If all conditions are met, the rotor blades (wings) appear automatically when this block is set. Otherwise you will get an error message.
+
+The check can be repeated by hitting the block. 
 
 [ta4_windturbine|image]
 
diff --git a/wind_turbine/rotor.lua b/wind_turbine/rotor.lua
index 71ba7e2..60cdaf6 100644
--- a/wind_turbine/rotor.lua
+++ b/wind_turbine/rotor.lua
@@ -29,8 +29,6 @@ local power = techage.power
 
 local Rotors = {}
 
-local MAX_NUM_FOREIGN_NODES = 50
-
 local Face2Dir = {[0]=
 	{x=0,  y=0,  z=1},
 	{x=1,  y=0,  z=0},
@@ -48,44 +46,51 @@ local function pos_and_yaw(pos, param2)
 	return pos, {x=0, y=yaw, z=0}
 end
 
-local function add_rotor(pos, nvm, player_name)
-	nvm.error = false
-	
-	if not techage.valid_place_for_windturbine(pos, player_name, 1) then
+local function check_rotor(pos, nvm)
+	local resp, err = techage.valid_place_for_windturbine(pos, nil, 1)
+	if not resp then
+		M(pos):set_string("infotext", S("TA4 Wind Turbine")..": "..err)
 		nvm.error = true
-		M(pos):set_string("infotext", S("TA4 Wind Turbine")..": "..S("Not suitable position!"))
-		return
+		return false
 	end
 	
-	local hash = minetest.hash_node_position(pos)
-	if not Rotors[hash] then
-		local node = minetest.get_node(pos)
-		local npos, yaw = pos_and_yaw(pos, node.param2)
-		local obj = minetest.add_entity(npos, "techage:rotor_ent")
-		obj:set_animation({x = 0, y = 119}, 0, 0, true)
-		obj:set_rotation(yaw)
-		Rotors[hash] = obj
-	end
-	
-	local own_num = M(pos):get_string("node_number") or ""
-	M(pos):set_string("infotext", S("TA4 Wind Turbine").." "..own_num)
-end	
-
-local function start_rotor(pos, nvm)
 	local npos = techage.get_pos(pos, "F")
 	local node = techage.get_node_lvm(npos)
 	if node.name ~= "techage:ta4_wind_turbine_nacelle" then
 		M(pos):set_string("infotext", S("TA4 Wind Turbine").." "..S("Nacelle is missing"))
 		nvm.error = true
-		return
+		return false
 	end
 	
-	nvm.providing = true
-	nvm.delivered = 0
-	power.generator_start(pos, Cable, CYCLE_TIME, 5)
-	local hash = minetest.hash_node_position(pos)
-	if Rotors[hash] then
-		Rotors[hash]:set_animation_frame_speed(50)
+	local own_num = M(pos):get_string("node_number") or ""
+	M(pos):set_string("infotext", S("TA4 Wind Turbine").." "..own_num)
+	nvm.error = false
+	return true
+end
+	
+local function add_rotor(pos, nvm)
+	if check_rotor(pos, nvm) then
+		local hash = minetest.hash_node_position(pos)
+		if not Rotors[hash] then
+			local node = minetest.get_node(pos)
+			local npos, yaw = pos_and_yaw(pos, node.param2)
+			local obj = minetest.add_entity(npos, "techage:rotor_ent")
+			obj:set_animation({x = 0, y = 119}, 0, 0, true)
+			obj:set_rotation(yaw)
+			Rotors[hash] = obj
+		end
+	end
+end	
+
+local function start_rotor(pos, nvm)
+	if not nvm.error then
+		nvm.providing = true
+		nvm.delivered = 0
+		power.generator_start(pos, Cable, CYCLE_TIME, 5)
+		local hash = minetest.hash_node_position(pos)
+		if Rotors[hash] then
+			Rotors[hash]:set_animation_frame_speed(50)
+		end
 	end
 end
 
@@ -126,14 +131,22 @@ local function after_place_node(pos, placer)
 	local own_num = techage.add_node(pos, "techage:ta4_wind_turbine")
 	meta:set_string("node_number", own_num)
 	meta:set_string("owner", placer:get_player_name())
-	meta:set_string("infotext", S("TA4 Wind Turbine").." "..own_num)
 	nvm.providing = false
 	nvm.running = true
-	add_rotor(pos, nvm, placer:get_player_name())
+	add_rotor(pos, nvm)
 	minetest.get_node_timer(pos):start(CYCLE_TIME)
 	Cable:after_place_node(pos)
 end
 
+local function on_punch(pos, node, puncher, pointed_thing)
+	if minetest.is_protected(pos, puncher:get_player_name()) then
+		return
+	end
+	
+	local nvm = techage.get_nvm(pos)
+	add_rotor(pos, nvm)
+end
+	
 local function after_dig_node(pos, oldnode, oldmetadata)
 	local hash = minetest.hash_node_position(pos)
 	if Rotors[hash] and Rotors[hash]:get_luaentity() then
@@ -174,6 +187,7 @@ minetest.register_node("techage:ta4_wind_turbine", {
 	after_dig_node = after_dig_node,
 	tubelib2_on_update2 = tubelib2_on_update2,
 	on_timer = node_timer,
+	on_punch = on_punch,
 	paramtype2 = "facedir",
 	groups = {cracky=2, crumbly=2, choppy=2},
 	is_ground_content = false,