diff --git a/Mk2_3phase_RFdatalog_temp/utils_relay.h b/Mk2_3phase_RFdatalog_temp/utils_relay.h
index 3a25727b..e0f37b89 100644
--- a/Mk2_3phase_RFdatalog_temp/utils_relay.h
+++ b/Mk2_3phase_RFdatalog_temp/utils_relay.h
@@ -19,8 +19,9 @@
 #include "utils_pins.h"
 
 /**
- * @brief Config parameters for relay diversion
+ * @brief Relay diversion config and engine
  * 
+ * @tparam T Duration in minutes of the sliding average
  */
 template< uint8_t T = 1 > class relayOutput
 {
@@ -105,11 +106,15 @@ template< uint8_t T = 1 > class relayOutput
 
   /**
    * @brief Increment the duration of the current state
+   * @details This function must be called every second.
    * 
    */
   void inc_duration()
   {
-    ++duration;
+    if (duration < UINT16_MAX)
+    {
+      ++duration;
+    }
   }
 
   /**
@@ -177,8 +182,8 @@ template< uint8_t T = 1 > class relayOutput
   const uint16_t minON{ 5 * 60 };         /**< Minimum duration in seconds the relay is turned ON */
   const uint16_t minOFF{ 5 * 60 };        /**< Minimum duration in seconds the relay is turned OFF */
 
-  uint16_t duration{ 0 };           /**< Duration of the current state */
-  bool relayState{ false };         /**< State of the relay */
+  uint16_t duration{ 0 };                 /**< Duration of the current state */
+  bool relayState{ false };               /**< State of the relay */
 
   static inline movingAvg< int16_t, T * 60 / DATALOG_PERIOD_IN_SECONDS > sliding_Average;
 };