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The EXTR. FAN ERROR message appears when the extruder fan does not receive any RPM (Revolutions per Minute) readings, in other words, there is something preventing it from spinning. The extruder fan is the Noctua fan on the left of the extruder. If you have issues with the front print fan, please see Print fan is not spinning.
From the LCD menu - Support - Extruder Info, you can find the RPM reading of the 3-wire fans that support this. The expected range should be from ~3500 - 4200 RPM on both fans, when running at full speed. Only the print fan speed can be adjusted by the user.
Visually inspect the extruder fan and make sure there is no debris preventing it from spinning.
Bigger parts can be cleared with tweezers, dust can be cleared with a computer cleaner spray (hold the fan with your hand while blowing at it, otherwise, you might damage the blades).
If you have replaced one of the fans with a replacement not supporting RPM sensing, then you can turn off the monitoring in the LCD Menu - Settings - Check fans.
If the extruder fan stopped working completely, it must be replaced. You can purchase a new one at our e-shop or contact the support for a Warranty replacement.
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