diff --git a/target/linux/kirkwood/base-files/etc/init.d/hwmon_fancontrol b/target/linux/kirkwood/base-files/etc/init.d/hwmon_fancontrol
index c64ed1100cb..334a2a08ef9 100755
--- a/target/linux/kirkwood/base-files/etc/init.d/hwmon_fancontrol
+++ b/target/linux/kirkwood/base-files/etc/init.d/hwmon_fancontrol
@@ -27,10 +27,22 @@ boot() {
 		;;
 	zyxel,nsa310b)
 		path_to_hwmon='/sys/devices/platform/ocp@f1000000/f1011000.i2c/i2c-0/0-002e/hwmon/hwmon0'
-		echo 2 > "$path_to_hwmon/pwm1_enable" # fan is on pwm1
-		echo 1 > "$path_to_hwmon/pwm1_auto_channels" # temp1 is the only one that changes
-		echo 23000 > "$path_to_hwmon/temp1_auto_temp_min"
-		echo 43000 > "$path_to_hwmon/temp1_auto_temp_max" # next step is 49600 millicelsius, or 50 celsius, 43 celsius is better
+		# use the max. value of (temp1) OR (temp2) OR (temp3) as an input
+		# for the PWM of the cooling fan
+		echo 123 > "$path_to_hwmon/pwm1_auto_channels"
+		# Temperature sensor #1 placed on mainboard
+		echo 30000 > "$path_to_hwmon/temp1_auto_temp_min"
+		echo 49600 > "$path_to_hwmon/temp1_auto_temp_max"
+		# Temperature sensor #2 placed on mainboard
+		# range: 0 to 127000 in steps of 1000 [millicelsius]
+		echo 30000 > "$path_to_hwmon/temp2_auto_temp_min"
+		# range: 0 to 127000 in steps of ???? [millicelsius]
+		echo 49600 > "$path_to_hwmon/temp2_auto_temp_max"
+		# Temperature sensor #3 placed close to a chipset
+		# range: 0 to 60000 in steps of 1000 [millicelsius]
+		echo 23000 > "$path_to_hwmon/temp3_auto_temp_min"
+		# pre-defined steps: 103000, 122000, 143300, 170000 in [millicelsius]
+		echo 103000 > "$path_to_hwmon/temp3_auto_temp_max"
 		;;
 	esac
 }