Heater Fault heater 1 will not reset.

akrogolf

@Phaedrux

How would i enable it? Cannot get passed fault - it instantly triggers fault again when i reset it.

It has ~24V crossed in the "fault position"

I checked another machine which does not have a voltage crossed when heaters turned off.

Phaedrux

Do you know what may have shorted?

Can you grab a photo of the heater terminal area? Do you notice any damage to the mosfet?

Where did you hear the sparky pop from? The hotend, or the board?

deckingman

@Phaedrux This might be significant. In the first post the OP stayed " also just noticed that i do not get an MCU temperature reading on the faulted machine."

akrogolf

@Phaedrux I ended up installing a new board... the one i took off still looks brand new i really inspected it everywhere. thanks for trying to help

dc42

@akrogolf said in Heater Fault heater 1 will not reset.:

M950 H1 C"out1+out2" T1; ;2 Heaters wired to separate connectors but treated as a single logical heater
...
M143 H1 P1 S310 T2 A0;

You are using sensor 1 to control heater 1 and sensor 2 to monitor it. What reading were you getting from sensor 2? The error message suggests that sensor 2 is providing a very high reading or not providing a reading at all.

akrogolf

@dc42 Hi David, sorry for the late response and thanks for chiming in! So I've been having a hell of a time. I swapped the board and and changed the sensors and its been good.

On another machine my extruder was not working. Like an idiot, this was 100% my fault, i pulled the extruder motor cable out of the 2+ daughter board socket and the hole daughter board came with it - with the machine on (i thought it was off because i turned the switch off but i forgot this switch was just hardwired and did nothing - i needed to pull the plug to turn power off). I quickly plugged it back in it went pop and fried everything.. I know not to do that but the second i pulled it off i realized the machine was still on and i was so flustered i don't know what i was thinking - just plug it back in real quick and it will be OK. lesson learned i guess. This board will not plug in via USB, my pc does not recognize it, and nothing seems to be working - ie wifi.

Anyways, i put the old board (the one with broken thermister sensor 2 that we are talking about on this forumn) on it and just didn't use sensor 2. This worked for about 4 days and then it went pop mid print. Mind you this is on a different machine with an E3D thermister (firmware was changed) than the original machine it popped on. I think the original short may have damaged more than just sensor two and it was hanging on by a thread until it finally broke? Now both thermister sensors do not work and i cannot clear a heater fault - when i clear it it instantly faults no matter whichc sensor port is occupied. Everythign else seems to work on this board, wifi, usb pc connection.

in response to your comment, I am using magnum+ and that is the recommended config according to slice engineering. Sensor 2 gave no reading. (it said 0).

I purchased another mini5 board from fillastruder and am waiting for it to show up. in the mean time i am shielding all the thermister wires with fiberglass silicon jackets and am getting a bit more organized with my wiring.. I print about 3 kg's of plastic a day with these machines so this is something i need to get sorted out, and i want to stay with duet as i know this is most likely my fault - which is probably the case for most warranty claims.

For these two boards that i have... Is there anything i can do? I purchases from fillastruder in March 2022 but have only used them fro about 3 months. I know this is just out of warranty. I also know that i made some mistakes - the board that i pulled the dauter board out i take full responsibility but with the one with thermister sensors i am not sure what went wrong. Sounds like the pt1000 shorted and caused some issues... I am also using a metal print head where the pt1000 wire jacket was touching metal - maybe it arced? Anyways, i would really appreciated some guidance on what to do with these two boards. If there is a repair service, if can get some sort of warranty, recycling, something.. Thanks in advance. I really appreciate the documentation and community around Duet. Which is why i went those route over btt or others.

elmoret

@dc42 / @Phaedrux

Possibly a blown VSSA fuse on the board with no thermistor inputs?

https://duet3d.dozuki.com/Wiki/How_to_destroy_your_Duet_2

elmoret

@T3P3Tony ?

Phaedrux

Sorry for the delay. Reviewing the thread.

akrogolf

@Phaedrux Thankyou

dc42

@akrogolf I suspect you either have an intermittent short in the hot end between sensor 2 and the heater (possibly via the hot end metalwork) or you have had electrostatic discharge (ESD) between the hot end metalwork and the sensor wiring. The Duet temperature inputs can normally tolerate a short but do not always tolerate ESD.

My suggestions:

Ground the hot end metalwork to Duet ground, either directly to the VIN ground wire or indirectly through a high value resistor to any Duet ground connection. This will prevent extrusion causing a build up of static charge.
Test all three temperature inputs of the Duet 3 Mini using either a thermistor or PT1000 sensor that is not mounted in a hot end, or using a fixed resistor. They should give the same reading to within a few degrees. If the input that sensor 2 was connected to turns out to be faulty then it may be possible to rescue it by replacing the series resistor.

akrogolf

@dc42 I totally rewired everything. I did as you suggested for new wiring (ordered a new board).

I tested the temp inputs, i get no reading on 1 or 2, and 0 works. If i were to replace said resistor.... where would i find information on this?

Anything about a warranty claim?

dc42

@akrogolf if inputs 0 works but 1 and 2 don't then it could be that the series resistors for both input 1 and 2 have failed because of ESD or a short on the hot end. The series resistors are R60, R61 and R62 for inputs 0, 1, 2 respectively. They are 2.2K 0.1% tolerance 0402 size resistors. You could replace the faulty ones with 2.2K 1% tolerance resistors, at the cost of slightly less accuracy when using PT100 sensors.

These resistors are located close to the temperature connectors. Here is an extract from the PCB layout:

I suggest that you test the resistors with a multimeter before removing them. Bear in mind that lead-free solder tends to develop a tin oxide coating, so it can be hard to get a good contact between the multimeter probes and the resistors.

I find that the easiest way to remove 0402 components is to use a soldering iron with a bit that is just large enough to cover both ends of the component. Preferably, place the Duet on a hot plate heated to between 100C and 125C and allow it to heat up. Put some fresh flux-cored solder on the soldering iron bit and immediately apply it to the component. When the solder melts, surface tension will usually cause the component to stick to the bit and it will lift off when you remove the soldering iron.

To solder a new 0402 component in place, I normally clean the solder off one of the pads using solder wick and then apply no-clean flux to both pads. Using a fine-tipped soldering iron bit I heat the pad I didn't clean and with fine tweezers I push the new resistor on to that pad. Remove the soldering iron and let the solder set. Then solder the other end.

Alternatively, if the old resistors have failed open circuit, you can leave them in place and solder the new resistors on top of them.

You haven't indicated in your profile which country you are in; but if it happens to be the UK then I can do this for you. Otherwise, you may have a hackspace or makerspace local to you where you can find someone more experienced to help you.

It's also possible to use hot air soldering equipment to desolder and solder the resistors, but in this case the plastic parts of the temperature connectors must be removed first, otherwise the hot air will melt them.

akrogolf

@dc42 I don't really have time to do this type of repair. I have 2 boards that are not in use. Is there anythign duet can do as far as warranty replacments?

I have 4 boards total - all duet 5 mini - 2 of them are described in this thread. A third just started doing this:

Your Duet rejected the HTTP request: page not found
Check that the SD card is mounted and has the correct files in its /www folder

... I reformatted a new card and tried the help section in https://forum.duet3d.com/topic/6798/your-duet-rejected-the-http-request-page-not-found.

with no luck.

So now I just have the 1 board working on 1 printer..

akrogolf

@dc42 I get this error when trying to remount the SD card - it does this for 2 different cards.

WiFi module is connected to access point *********, IP address 192.168.68.107
Error: M21: Cannot initialise SD card 0: Card is unusable
ok
M21;
Error: M21: Cannot initialise SD card 0: Card is unusable
ok

Also the usb connection seems to interrupt when I power on the machine - as opposed to just being powered through the usb.

Phaedrux

@akrogolf said in Heater Fault heater 1 will not reset.:

Is there anythign duet can do as far as warranty replacments?

Can you give a listing of your boards and their faults and where and when they were purchased?

akrogolf

@Phaedrux

They were purchased from fillastruder.

202106-0131 : both hotend temp sensor inputs do not work.

202106-0138 : cannot connect to Wi-Fi. Cannot connect to pc with usb cable. Most things do not work

The other was is still mount to the machine: I get the error listed above. Seems to be as card socket doesn’t work.

Phaedrux

@akrogolf said in Heater Fault heater 1 will not reset.:

The other was is still mount to the machine: I get the error listed above. Seems to be as card socket doesn’t work.

Also from June 2021?

akrogolf

@Phaedrux all purchase feb 2022, wasn’t installed untill November 2022.

I bought a single replacement with new chip this year but that one is working - only one of 4 that is.

Phaedrux

Please send an email to warranty@duet3d.com and CC your reseller. Include a link to this forum thread and the details of your original purchase. You'll receive a reply with a form to fill out.