diff --git a/LibreHardwareMonitorLib/Hardware/Motherboard/Lpc/IT87XX.cs b/LibreHardwareMonitorLib/Hardware/Motherboard/Lpc/IT87XX.cs
index 06b9679..171a602 100644
--- a/LibreHardwareMonitorLib/Hardware/Motherboard/Lpc/IT87XX.cs
+++ b/LibreHardwareMonitorLib/Hardware/Motherboard/Lpc/IT87XX.cs
@@ -1,7 +1,7 @@
 // This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
 // If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
 // Copyright (C) LibreHardwareMonitor and Contributors.
-// Partial Copyright (C) Michael Möller <mmoeller@openhardwaremonitor.org> and Contributors.
+// Partial Copyright (C) Michael Möller <mmoeller@openhardwaremonitor.org> and Contributors.
 // All Rights Reserved.
 
 using System;
@@ -22,9 +22,11 @@ namespace LibreHardwareMonitor.Hardware.Motherboard.Lpc
         private readonly int _gpioCount;
         private readonly bool _has16BitFanCounter;
         private readonly bool _hasNewerAutoPwm;
-        private readonly byte[] _initialFanPwmControl = new byte[3];
+        private readonly byte[] _initialFanPwmControl = new byte[3]; // This will also store the 2nd control register value.
         private readonly byte[] _initialFanPwmControlMode = new byte[3];
+        private readonly byte[] _initialFanMainControlValue = new byte[3]; // Initial Fan Controller Main Control Register value. 
         private readonly bool[] _restoreDefaultFanPwmControlRequired = new bool[3];
+        private readonly byte[] _fanMainControlValue = { 0b00000001, 0b00000010, 0b00000100 }; // Values to  be applied to FAN_MAIN_CTRL_REG to gain control of each fan.
         private readonly byte _version;
         private readonly float _voltageGain;
 
@@ -471,12 +473,16 @@ namespace LibreHardwareMonitor.Hardware.Motherboard.Lpc
                 {
                     _initialFanPwmControlMode[index] = ReadByte(FAN_PWM_CTRL_REG[index], out bool _);
                     _initialFanPwmControl[index] = ReadByte(FAN_PWM_DUTY_REG[index], out bool _);
+                    _initialFanMainControlValue[index] =  ReadByte(FAN_MAIN_CTRL_REG, out bool _); // Save default control reg value.
                 }
             }
             else
             {
                 if (!_restoreDefaultFanPwmControlRequired[index])
+                {
                     _initialFanPwmControl[index] = ReadByte(FAN_PWM_CTRL_REG[index], out bool _);
+                    _initialFanMainControlValue[index] =  ReadByte(FAN_MAIN_CTRL_REG, out bool _); // Save default control reg value.
+                }
             }
 
             _restoreDefaultFanPwmControlRequired[index] = true;
@@ -490,6 +496,9 @@ namespace LibreHardwareMonitor.Hardware.Motherboard.Lpc
                 {
                     WriteByte(FAN_PWM_CTRL_REG[index], _initialFanPwmControlMode[index]);
                     WriteByte(FAN_PWM_DUTY_REG[index], _initialFanPwmControl[index]);
+                    if ((_initialFanMainControlValue[index] & ~_fanMainControlValue[index]) == _initialFanMainControlValue[index]){ // Bitwise opperand to check if control bit needs to be changed to restore defaults.
+                        WriteByte(FAN_MAIN_CTRL_REG, (byte)( ReadByte(FAN_MAIN_CTRL_REG, out bool _) & ~_fanMainControlValue[index]));
+                    }
                     _restoreDefaultFanPwmControlRequired[index] = false;
                 }
             }
@@ -498,6 +507,9 @@ namespace LibreHardwareMonitor.Hardware.Motherboard.Lpc
                 if (_restoreDefaultFanPwmControlRequired[index])
                 {
                     WriteByte(FAN_PWM_CTRL_REG[index], _initialFanPwmControl[index]);
+                    if ((_initialFanMainControlValue[index] & ~_fanMainControlValue[index]) == _initialFanMainControlValue[index]){ // Bitwise opperand to check if control bit needs to be changed to restore defaults.
+                        WriteByte(FAN_MAIN_CTRL_REG, (byte)( ReadByte(FAN_MAIN_CTRL_REG, out bool _) & ~_fanMainControlValue[index]));
+                    }
                     _restoreDefaultFanPwmControlRequired[index] = false;
                 }
             }
@@ -524,6 +536,9 @@ namespace LibreHardwareMonitor.Hardware.Motherboard.Lpc
         private readonly byte[] FAN_TACHOMETER_EXT_REG = { 0x18, 0x19, 0x1a, 0x81, 0x83, 0x4c };
         private readonly byte[] FAN_TACHOMETER_REG = { 0x0d, 0x0e, 0x0f, 0x80, 0x82, 0x4c };
 
+        private readonly byte FAN_MAIN_CTRL_REG = 0x13; // Address of the Fan Controller Main Control Register. No need for the 2nd control register (bit 7 of 0x15 0x16 0x17), PWM value will set it to manual mode when new value is set.
+
+
 #pragma warning restore IDE1006 // Naming Styles
         // ReSharper restore InconsistentNaming
     }