Home Camera Repair How to Disable the Thermal Cut-out on a Nikon SB-900 Flash Unit

How to Disable the Thermal Cut-out on a Nikon SB-900 Flash Unit

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The Nikon SB-900 Speedlight is a rather powerful flash unit. When fired rapidly, it can get hot. The flash has a built-in heat sensor called the “Thermal Cut-out” that is designed to protect it from overheating. The “Thermal Cut-out” can disable the flash for several minutes if it heats up from being fired rapidly. If you are shooting a wedding or important event, it may be a disaster to have the flash suddenly stop working. For this reason, Nikon has provided a means to override the “Thermal Cut-out,” with the understanding that the warranty on a new SB-900 is void if the flash is damaged from overheating while the heat sensor is disabled. Let’s examine how to use the menu system of the SB-900 to disable the “Thermal Cut-out.”

Instructions