Hi all,
My Flashforge Creator Pro is displaying inaccurate temperatures for the right extruder (it reads 205 or 207 when the extruder is at room temperature.) Weirdly, unplugging the thermocouple from the bottom where it connects to the logic board does not disrupt this reading (whereas unplugging the left thermocouple will give me an “NA” reading for that extruder.)
Also, I tried swapping the thermocouple plugs on the logic board to see if the faulty temp would then show up on the left extruder, but the left extruder will still read correctly (less than 30 at room temp) even when the right thermocouple is plugged into it (and the right extruder will still display an erroneous 205C reading when the left thermocouple is plugged into it.)
Does this point to a problem on the logic board somewhere??!?
Trying to solve this issue without breaking the bank. Cheers everyone-
Kent
It would seem that way. Maybe you can try a factory reset on the board and see if it goes.
With the left one plugged into the position for the right does it heat and do everything correctly? I am guessing it does.
I have had this same problem. I thought it was the thermocouple and bought a replacement. No change. So I have assumed it was the control board but didn’t feel it was worth replacing since I don’t use the dual extrude often anyway I have just been getting by with one nozzle.
I would love to hear if you solved this without replacing the control board.
It is possible that the heating cartridge has gone bad, and is shorting against the extruder mount. This might cause the issue.
It is also possible that you have blown the FET. It can be replaced, but it requires someone who can solder surface mounts components. If you do not have that skill, do NOT try it. You will ruin your board. Find someone who can.
I am also worried that as you switch things around, you can be moving whatever caused the issue to create a real short, that can kill your motherboard.
Steps for repair:
1. Stop moving things around.
2. Reflash your firmware. Follow the instructions step by step in the sailfish firmware manual. (google it). Especially the step where you record your toolhead offsets and such before you reflash. It is possible that your firmware just got corrupted.
Now check if the problem has gone away. If it has not, then turn off the printer and do not turn it back on again until you do step 3. This would imply you have a short in one or many of either your thermistors or heater cartridges, and that short can send 24v down your 5v line, ruining your motherboard.
3. I know it sounds counter intuitive, but I would replace both heater cartridges and both thermistors. (uncle chucks printer parts or flashforge. Flashforge costs a little more, and take longer to get the parts from…) This is the least expensive way to go about trying to fix the problem.
If that still does not fix it, then you have a blown FET, and you need someone to replace it if you cannot.
Thanks so much for all the insight, if / when I resolve the issue I will be sure to update the thread here. Gonna take a stab at it in a week or two…
