Welcome to the SeeMeCNC Community

My setup: Rostock MAX v2 (originally the kit, upgraded arms, cheapskate, etc..) E3D v6 hot end

I went all-in on the accelerometer probe board, wiring harness, new 713maker effector and got it all hooked up using the extremely (possibly overly) detailed guide here: https://seemecnc.dozuki.com/Guide/Rosto ... de/49#s402

I upgraded the firmware, but my particular setup left a couple of head-scratching points on the Configuration.h

Here's what I went with:
Calibration seemed to work perfectly. Temps are reporting properly. I did notice that the hot end fan seems to run constantly. Not a huge deal.

PROBLEM: When I went to heat the hot end to load filament, the blue LED behind the connector on the accelerometer board, and the HE fan blue LED began flashing rapidly. The hot end was heating, but the HE fan had stopped. It was actually twitching slightly due to the pulses associated with the blinking, I guess.

I didn't let this go on too long since that is generally bad. I couldn't find anything in the firmware that seemed to make this be normal.

Any ideas? I'm guessing I have some wires crossed, or the HE280 setup uses a different type of fan?

One more piece of information. My "HEAT1" LED is flashing along the same beat when preheating the hot end, and it stops flashing when the hot end temp goes under 40C.. this has to be a clue.

If I've done this upgrade, is my machine now a v3? Maybe that's what I should have set in the firmware? Going to give that a try.

Different, but not better. Still not fixed.

FYI, one of the axes was reversed when set to v3.. so homing was briefly quite exciting.

Also tried HOTEND 2 since it only defined one PWM set of options.. no change.

The HE280's cooling fan should run all the time.

g.

Understood.. trying to figure out why it is stopping.

Might be a wiring issue - likely an intermittent connection if it was working at one time.

g.

It works whenever the hot end is not heating. I've checked all of the connections.

Any other possibilities?

geneb: I have to give it to ya. It was a wiring issue. Not intermittent.

The main hot-end red & black wires were reversed in the pre-made whip I bought with the other parts for this upgrade.

It was JJ w/SeeMeCNC's first suggestion when I created the support ticket. Apparently at least one other whip has had the same problem. Manufacturing defect.

Fortunately no damage was done, and it's working fine now that the wires are in the right spot in the connector.

Wow. I never would have guessed that. I guess someone else in the office besides JJ gets the Greyhound Experience.

Glad you got it sorted!

g.