diff --git a/board/czechlight/clearfog/boot.scr.txt b/board/czechlight/clearfog/boot.scr.txt
index f1004bc..9bb827a 100644
--- a/board/czechlight/clearfog/boot.scr.txt
+++ b/board/czechlight/clearfog/boot.scr.txt
@@ -7,6 +7,8 @@
 i2c mw 0x60 0x0a 0x80
 i2c mw 0x60 0x0b 0x80
 i2c mw 0x60 0x0c 0x80
+# reset fan controller
+i2c mw 0x20 0x00 0x40
 setenv bootargs root=/dev/mmcblk0p${rauc_part} init=/sbin/init-czechlight.sh rauc.slot=${rauc_slot} czechlight=${czechlight} systemd.machine_id=${machineid} panic=10 oops=panic spidev.bufsiz=131072 schedstats=enable
 if test -n ${czechlight} && load mmc 0:${rauc_part} ${fdt_addr_r} /boot/${czechlight}-clearfog.dtb; then
   echo "DTS: ${czechlight}-clearfog"
diff --git a/doc/architecture.md b/doc/architecture.md
index 1d964ff..58e323b 100644
--- a/doc/architecture.md
+++ b/doc/architecture.md
@@ -56,7 +56,7 @@
 
 - U-Boot [environment](https://elinux.org/U-boot_environment_variables_in_linux) is marked as "I'm trying to boot an A/B slot now" while keeping track of how many attaempts are remaining.
 
-- Once an A/B boot slot is chosen, another [U-Boot script](../board/czechlight/clearfog/boot.scr.txt) (which is a part of every system release and therefore updateable) changes LED blinking patterns, loads the [device tree](https://elinux.org/Device_Tree_Reference) (such as [this one](../board/czechlight/clearfog/sdn-roadm-line-clearfog.dts)) which provides Linux-level device description, and launches the kernel.
+- Once an A/B boot slot is chosen, another [U-Boot script](../board/czechlight/clearfog/boot.scr.txt) (which is a part of every system release and therefore updateable) changes LED blinking patterns, resets the fan controller, loads the [device tree](https://elinux.org/Device_Tree_Reference) (such as [this one](../board/czechlight/clearfog/sdn-roadm-line-clearfog.dts)) which provides Linux-level device description, and launches the kernel.
 
 ### 2) Linux Kernel: