I have been printing with PETG for a couple of days and noticed the part cooling fan was not working. If I manually started the fan on the control the fan would switch off immediately. I then started inspecting my filament settings to see if I had restricted the fan speed there or set the fan to not run at all. Once I changed back to PLA the problems really started due to no cooling taking place. Going to through the settings and manually attempting to start the fan did not work. I eventually discovered the fan plug was not secure on the PC board of the printer head. Once the plug was in place and I started the print again the fan started automatically. Problem solving would of been a lot easier if a warning was displayed indicating there was an error with the part cooling fan.
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