Duet 3 Heater failed open
-
Hey all! I have had many trouble free years with my duet, other than my dumbass burning out temperature sensor slots on the board. Today I went to start a print, and had a weird glitch where the endstop didn't trigger. Cue the horrible stepper grinding the belt noise, and I shut down the printer and restarted it. Homed nicely. Went to start printing, everything is fine. I notice my bed temp was about 7f above where I set it, and rising. So I shut down the bed on the web control, set it to inactive. Still rising. Cancel the print, and watch it continue to rise. Restarted the machine, and disconnected the hot bed. Put a multi meter to the bed connection, and as soon as I hit the power switch the bed receives 24v. I don't have a SSR or anything since my chamber is heated and my bed usually doesn't pull a ton. Is this something I can diagnose and fix myself further? I don't mind buying another duet, and honestly I'm kind of leaning towards that since I have been hard on this one. I had temp fuses in case something like this happens, but it's like the time my washing machine overflowed and flooded the two condos beneath me... I don't want to leave the same one unattended I'd rather just buy a new one lol. Just hoping it's something that's as simple as resoldering a relay.
Any advice is appreciated!
-
@silveroranges That’s a bit vague. Can you please elaborate on
- the type of Duet board
- the specs of the bed heater (watts @ volt)
-
@infiniteloop My bad it was pretty late when I wrote that. Duet 3 HC, the heater is a 350mmx350mm 24v heater that is 430watts.
-
@silveroranges said in Duet 3 Heater failed open:
the heater is a 350mmx350mm 24v heater that is 430watts
That thing draws ~18 amps - did you have to replace the 15A fuse, and if yes: with what?
I think you’ve blown the MOSFet - take a look at your board for visible damage of a chip. Can you publish a good narrow shot of the board?
