diff --git a/clion/CMakeLists.txt b/clion/CMakeLists.txt
index ad9ddb5..d7905d6 100644
--- a/clion/CMakeLists.txt
+++ b/clion/CMakeLists.txt
@@ -54,6 +54,7 @@ set(SRCFILES
         ../src/NukiOfficial.cpp
         ../src/NukiPublisher.cpp
         ../src/EspMillis.h
+        ../src/enums/NukiPinState.h
 )
 
 file(GLOB_RECURSE SRCFILESREC
diff --git a/src/NukiOpenerWrapper.cpp b/src/NukiOpenerWrapper.cpp
index a75ce08..b0fa58e 100644
--- a/src/NukiOpenerWrapper.cpp
+++ b/src/NukiOpenerWrapper.cpp
@@ -5,6 +5,8 @@
 #include "RestartReason.h"
 #include <NukiOpenerUtils.h>
 #include "Config.h"
+#include "enums/NukiPinState.h"
+#include "enums/NukiPinState.h"
 #include "hal/wdt_hal.h"
 #include <time.h>
 #include "esp_sntp.h"
@@ -436,7 +438,7 @@ void NukiOpenerWrapper::deactivateCM()
 
 bool NukiOpenerWrapper::isPinValid()
 {
-    return _preferences->getInt(preference_opener_pin_status, 4) == 1;
+    return _preferences->getInt(preference_opener_pin_status, (int)NukiPinState::NotConfigured) == (int)NukiPinState::Valid;
 }
 
 void NukiOpenerWrapper::setPin(const uint16_t pin)
@@ -635,7 +637,7 @@ void NukiOpenerWrapper::updateConfig()
                 updateAuth(false);
             }
 
-            const int pinStatus = _preferences->getInt(preference_opener_pin_status, 4);
+            const int pinStatus = _preferences->getInt(preference_opener_pin_status, (int)NukiPinState::NotConfigured);
 
             Nuki::CmdResult result = (Nuki::CmdResult)-1;
             int retryCount = 0;
@@ -659,7 +661,7 @@ void NukiOpenerWrapper::updateConfig()
                 Log->println("Nuki opener PIN is invalid or not set");
                 if(pinStatus != 2)
                 {
-                    _preferences->putInt(preference_opener_pin_status, 2);
+                    _preferences->putInt(preference_opener_pin_status, (int)NukiPinState::Invalid);
                 }
             }
             else
@@ -667,7 +669,7 @@ void NukiOpenerWrapper::updateConfig()
                 Log->println("Nuki opener PIN is valid");
                 if(pinStatus != 1)
                 {
-                    _preferences->putInt(preference_opener_pin_status, 1);
+                    _preferences->putInt(preference_opener_pin_status, (int)NukiPinState::Valid);
                 }
             }
         }
@@ -4061,7 +4063,7 @@ void NukiOpenerWrapper::notify(Nuki::EventType eventType)
     }
     else if(eventType == Nuki::EventType::ERROR_BAD_PIN)
     {
-        _preferences->putInt(preference_lock_pin_status, 2);
+        _preferences->putInt(preference_lock_pin_status, (int)NukiPinState::Invalid);
     }
     else if(eventType == Nuki::EventType::BLE_ERROR_ON_DISCONNECT)
     {
diff --git a/src/NukiWrapper.cpp b/src/NukiWrapper.cpp
index a5e4e28..9a3e6d2 100644
--- a/src/NukiWrapper.cpp
+++ b/src/NukiWrapper.cpp
@@ -5,6 +5,7 @@
 #include "RestartReason.h"
 #include <NukiLockUtils.h>
 #include "Config.h"
+#include "enums/NukiPinState.h"
 #include "hal/wdt_hal.h"
 #include <time.h>
 #include "esp_sntp.h"
@@ -454,7 +455,7 @@ void NukiWrapper::lockngounlatch()
 
 bool NukiWrapper::isPinValid()
 {
-    return _preferences->getInt(preference_lock_pin_status, 4) == 1;
+    return _preferences->getInt(preference_lock_pin_status, (int)NukiPinState::NotConfigured) == (int)NukiPinState::Valid;
 }
 
 void NukiWrapper::setPin(const uint16_t pin)
@@ -648,7 +649,7 @@ void NukiWrapper::updateConfig()
                 updateAuth(false);
             }
 
-            const int pinStatus = _preferences->getInt(preference_lock_pin_status, 4);
+            const int pinStatus = _preferences->getInt(preference_lock_pin_status, (int)NukiPinState::NotConfigured);
 
             Nuki::CmdResult result = (Nuki::CmdResult)-1;
             int retryCount = 0;
@@ -671,7 +672,7 @@ void NukiWrapper::updateConfig()
                 Log->println("Nuki Lock PIN is invalid or not set");
                 if(pinStatus != 2)
                 {
-                    _preferences->putInt(preference_lock_pin_status, 2);
+                    _preferences->putInt(preference_lock_pin_status, (int)NukiPinState::Invalid);
                 }
             }
             else
@@ -679,7 +680,7 @@ void NukiWrapper::updateConfig()
                 Log->println("Nuki Lock PIN is valid");
                 if(pinStatus != 1)
                 {
-                    _preferences->putInt(preference_lock_pin_status, 1);
+                    _preferences->putInt(preference_lock_pin_status, (int)NukiPinState::Valid);
                 }
             }
         }
@@ -4167,7 +4168,7 @@ void NukiWrapper::notify(Nuki::EventType eventType)
             }
             else if(eventType == Nuki::EventType::ERROR_BAD_PIN)
             {
-                _preferences->putInt(preference_lock_pin_status, 2);
+                _preferences->putInt(preference_lock_pin_status, (int)NukiPinState::Invalid);
             }
             else if(eventType == Nuki::EventType::BLE_ERROR_ON_DISCONNECT)
             {
diff --git a/src/WebCfgServer.cpp b/src/WebCfgServer.cpp
index 85d9f47..a8757d0 100644
--- a/src/WebCfgServer.cpp
+++ b/src/WebCfgServer.cpp
@@ -4297,12 +4297,12 @@ esp_err_t WebCfgServer::buildHtml(PsychicRequest *request, PsychicResponse* resp
 
         if(_nuki->isPaired())
         {
-            String lockState = pinStateToString(_preferences->getInt(preference_lock_pin_status, 4));
+            const String lockState = pinStateToString((NukiPinState)_preferences->getInt(preference_lock_pin_status, (int)NukiPinState::NotConfigured));
             printParameter(&response, "Nuki Lock PIN status", lockState.c_str(), "", "lockPin");
 
             if(_preferences->getBool(preference_official_hybrid_enabled, false))
             {
-                String offConnected = _nuki->offConnected() ? "Yes": "No";
+                const String offConnected = _nuki->offConnected() ? "Yes": "No";
                 printParameter(&response, "Nuki Lock hybrid mode connected", offConnected.c_str(), "", "lockHybrid");
             }
         }
@@ -4323,7 +4323,7 @@ esp_err_t WebCfgServer::buildHtml(PsychicRequest *request, PsychicResponse* resp
         }
         if(_nukiOpener->isPaired())
         {
-            String openerState = pinStateToString(_preferences->getInt(preference_opener_pin_status, 4));
+            String openerState = pinStateToString((NukiPinState)_preferences->getInt(preference_opener_pin_status, (int)NukiPinState::NotConfigured));
             printParameter(&response, "Nuki Opener PIN status", openerState.c_str(), "", "openerPin");
         }
     }
@@ -4876,7 +4876,7 @@ esp_err_t WebCfgServer::buildStatusHtml(PsychicRequest *request, PsychicResponse
 
         if(_nuki->isPaired())
         {
-            json["lockPin"] = pinStateToString(_preferences->getInt(preference_lock_pin_status, 4));
+            json["lockPin"] = pinStateToString((NukiPinState)_preferences->getInt(preference_lock_pin_status, (int)NukiPinState::NotConfigured));
             if(strcmp(lockStateArr, "undefined") != 0)
             {
                 lockDone = true;
@@ -4910,7 +4910,7 @@ esp_err_t WebCfgServer::buildStatusHtml(PsychicRequest *request, PsychicResponse
 
         if(_nukiOpener->isPaired())
         {
-            json["openerPin"] = pinStateToString(_preferences->getInt(preference_opener_pin_status, 4));
+            json["openerPin"] = pinStateToString((NukiPinState)_preferences->getInt(preference_opener_pin_status, (int)NukiPinState::NotConfigured));
             if(strcmp(openerStateArr, "undefined") != 0)
             {
                 openerDone = true;
@@ -4943,18 +4943,19 @@ esp_err_t WebCfgServer::buildStatusHtml(PsychicRequest *request, PsychicResponse
     return resp->send();
 }
 
-String WebCfgServer::pinStateToString(uint8_t value)
+const String WebCfgServer::pinStateToString(const NukiPinState& value) const
 {
     switch(value)
     {
-    case 0:
-        return String("PIN not set");
-    case 1:
-        return String("PIN valid");
-    case 2:
-        return String("PIN invalid or not set");
-    default:
-        return String("Unknown");
+        case NukiPinState::NotSet:
+            return String("PIN not set");
+        case NukiPinState::Valid:
+            return String("PIN valid");
+        case NukiPinState::Invalid:
+            return String("PIN set but invalid");
+        case NukiPinState::NotConfigured:
+        default:
+            return String("Unknown");
     }
 }
 
@@ -6030,12 +6031,12 @@ esp_err_t WebCfgServer::processUnpair(PsychicRequest *request, PsychicResponse*
     if(!opener && _nuki != nullptr)
     {
         _nuki->unpair();
-        _preferences->putInt(preference_lock_pin_status, 4);
+        _preferences->putInt(preference_lock_pin_status, (int)NukiPinState::NotConfigured);
     }
     if(opener && _nukiOpener != nullptr)
     {
         _nukiOpener->unpair();
-        _preferences->putInt(preference_opener_pin_status, 4);
+        _preferences->putInt(preference_opener_pin_status, (int)NukiPinState::NotConfigured);
     }
 
     _network->disableHASS();
@@ -6381,7 +6382,7 @@ const std::vector<std::pair<String, String>> WebCfgServer::getGpioOptions() cons
     return options;
 }
 
-String WebCfgServer::getPreselectionForGpio(const uint8_t &pin)
+const String WebCfgServer::getPreselectionForGpio(const uint8_t &pin) const
 {
     const std::vector<PinEntry>& pinConfiguration = _gpio->pinConfiguration();
 
diff --git a/src/WebCfgServer.h b/src/WebCfgServer.h
index bba0e17..f003bf4 100644
--- a/src/WebCfgServer.h
+++ b/src/WebCfgServer.h
@@ -2,6 +2,8 @@
 
 #include <Preferences.h>
 #include <PsychicHttp.h>
+#include "enums/NukiPinState.h"
+
 #ifdef CONFIG_ESP_HTTPS_SERVER_ENABLE
 #include <PsychicHttpsServer.h>
 #endif
@@ -85,8 +87,8 @@ private:
     const std::vector<std::pair<String, String>> getNetworkCustomCLKOptions() const;
     #endif
 
-    String getPreselectionForGpio(const uint8_t& pin);
-    String pinStateToString(uint8_t value);
+    const String getPreselectionForGpio(const uint8_t& pin) const;
+    const String pinStateToString(const NukiPinState& value) const;
 
     void printParameter(PsychicStreamResponse *response, const char* description, const char* value, const char *link = "", const char *id = "");
 
diff --git a/src/enums/NukiPinState.h b/src/enums/NukiPinState.h
new file mode 100644
index 0000000..935c21a
--- /dev/null
+++ b/src/enums/NukiPinState.h
@@ -0,0 +1,9 @@
+#pragma once
+
+enum class NukiPinState
+{
+    NotSet = 0,
+    Valid = 1,
+    Invalid = 2,
+    NotConfigured = 4 // default value used for preferences.getInt() when not configured by user
+};
\ No newline at end of file