Hotend fan is not spinning
Before we start checking your Hotend fan, power down and unplug your USB cable if connected. Open the electronics covering and examine the MK2/MK2S miniRAMBo electronics wiring or MK3 EINSY miniRAMBo electronics wiring.
Make sure that the fan is:
- Plugged into the right connector.
- Plugged in with the proper connector orientation.
- Plugged in completely and making good electrical contact.
You can easily test the nozzle Hotend fan function from the LCD menu Preheat - PLA. When the Hotend temperature reaches the 50°C, the fan should immediately spin up.
When the Hotend fan should actually spin
Hotend cooling fan cools down the top part of the Hotend (heatsink) from the heat which is transferred from the heater block. It always starts up when Hotend temperature reading reaches 50°C and spins for the whole duration of the print! If the fan is not functioning, you can expect the nozzle to jam after the first few layers.
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