diff --git a/src/client.cpp b/src/client.cpp
index b0ac929..0dc079c 100644
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -290,7 +290,8 @@ void loop() {
                         ESP_LOGI(TAG, "BLE: initialized after key provisioning");
                     }
                 } else {
-                    Serial.println("ERROR: invalid key format");
+                    ESP_LOGE(TAG, "Invalid key format");
+                    Serial.println("ERROR");
                 }
             } else if (serialBuf.startsWith("SET_ID:")) {
                 String hex = serialBuf.substring(7);
@@ -305,7 +306,8 @@ void loop() {
                     Serial.println("OK");
                     Serial.println("UUID stored in NVS");
                 } else {
-                    Serial.println("ERROR: invalid UUID format");
+                    ESP_LOGE(TAG, "Invalid UUID format");
+                    Serial.println("ERROR");
                 }
             } else if (serialBuf.startsWith("SET_SERVER:")) {
                 String hex = serialBuf.substring(11);
@@ -331,7 +333,8 @@ void loop() {
                         ESP_LOGI(TAG, "BLE: initialized after server provisioning");
                     }
                 } else {
-                    Serial.println("ERROR: invalid server UUID format");
+                    ESP_LOGE(TAG, "Invalid server UUID format");
+                    Serial.println("ERROR");
                 }
             }
             serialBuf = "";
@@ -451,7 +454,7 @@ void loop() {
 
     static uint32_t heartbeat = 0;
     if (millis() - heartbeat > 60000) {
-        ESP_LOGI(TAG, "[heartbeat] t1=%s t2=%s btn=%s r1=%s r2=%s connected=%s",
+        ESP_LOGD(TAG, "[heartbeat] t1=%s t2=%s btn=%s r1=%s r2=%s connected=%s",
             !t1Active ? "YES" : "no",
             !t2Active ? "YES" : "no",
             btnActive ? "YES" : "no",
diff --git a/src/main.cpp b/src/main.cpp
index 4146962..e12cbd5 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -653,7 +653,7 @@ void loop() {
     if (!otaInProgress && millis() - heartbeat > 60000) {
         bool anyBle1 = (connActive[0] && bleRelay1[0]) || (connActive[1] && bleRelay1[1]);
         bool anyBle2 = (connActive[0] && bleRelay2[0]) || (connActive[1] && bleRelay2[1]);
-        ESP_LOGI(TAG, "[heartbeat] R1=%s R2=%s t1=%s t2=%s btn=%s ble1=%s ble2=%s clients=%d",
+        ESP_LOGD(TAG, "[heartbeat] R1=%s R2=%s t1=%s t2=%s btn=%s ble1=%s ble2=%s clients=%d",
             relay1State ? "ON" : "OFF",
             relay2State ? "ON" : "OFF",
             t1Active ? "YES" : "no",