diff --git a/esphome/components/alpha3/alpha3.cpp b/esphome/components/alpha3/alpha3.cpp
index f22a8e2444..6e82ec047d 100644
--- a/esphome/components/alpha3/alpha3.cpp
+++ b/esphome/components/alpha3/alpha3.cpp
@@ -125,7 +125,7 @@ void Alpha3::gattc_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc
         this->current_sensor_->publish_state(NAN);
       if (this->speed_sensor_ != nullptr)
         this->speed_sensor_->publish_state(NAN);
-      if (this->speed_sensor_ != nullptr)
+      if (this->voltage_sensor_ != nullptr)
         this->voltage_sensor_->publish_state(NAN);
       break;
     }
diff --git a/esphome/components/emc2101/emc2101.cpp b/esphome/components/emc2101/emc2101.cpp
index 7d85cd31cf..068e25568f 100644
--- a/esphome/components/emc2101/emc2101.cpp
+++ b/esphome/components/emc2101/emc2101.cpp
@@ -72,7 +72,7 @@ void Emc2101Component::setup() {
     config |= EMC2101_DAC_BIT;
   }
   if (this->inverted_) {
-    config |= EMC2101_POLARITY_BIT;
+    reg(EMC2101_REGISTER_FAN_CONFIG) |= EMC2101_POLARITY_BIT;
   }
 
   if (this->dac_mode_) {  // DAC mode configurations
diff --git a/esphome/components/mpu6886/mpu6886.cpp b/esphome/components/mpu6886/mpu6886.cpp
index 68b77b59c9..02747da306 100644
--- a/esphome/components/mpu6886/mpu6886.cpp
+++ b/esphome/components/mpu6886/mpu6886.cpp
@@ -80,7 +80,7 @@ void MPU6886Component::setup() {
   accel_config &= 0b11100111;
   accel_config |= (MPU6886_RANGE_2G << 3);
   ESP_LOGV(TAG, "    Output accel_config: 0b" BYTE_TO_BINARY_PATTERN, BYTE_TO_BINARY(accel_config));
-  if (!this->write_byte(MPU6886_REGISTER_GYRO_CONFIG, gyro_config)) {
+  if (!this->write_byte(MPU6886_REGISTER_ACCEL_CONFIG, accel_config)) {
     this->mark_failed();
     return;
   }