I bought a used M2, it's got a single V4 hot end and serial number 31115783. Since I got it I the 50mm fan seems to only run if it's set to about 92% or higher, even if it's coming down from 100% it will shut off with any percentage below that. Just got a new fan from Makergear, no change. The fan I...

I have a red light on my RAMBo board... it's LED5...can ANYONE tell me what that indicates?

Thanks.

Dave C