Heater Fault
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Hi, My DuetWifi is showing a permanent fault on heater 1 as per the attached PNG. I have measured the resistance of the heater 1 thermistor and it reads 159kOhm. Just in case, also checked the heater 2 thermistor which is showing 157KOhm and the Bed which is showing 158KOhm
The above measurements were taken at the board end of the cables.I have attached diagnostic and setup files.
1_1557818613624_K8200Duet Fault Diag.txt 0_1557818613624_K8200Duet Fault config.txt -
post your config
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I have, its linked in the message under the picture.
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the config looks ok.
did the temperature work before?you are running a very old version of the firmware (1.2) consider updating to the current version 2.02
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Everything has been working fine for a long time, I was printing fine yesterday, but after the print had ended this fault just presented itself. I have obviously tried switching the unit on and off multiple times, but it always comes up with the error. I know the FW is old, but since its been working fine, I don't think its related
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could be a blown vssa fuse.
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disconnect all and connect one at a time to rule out shorting of the vssa line.
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@veti said in Heater Fault:
could be a blown vssa fuse.
Yes, if your Duet is a revision 1.0 or 1.01 then with power off, use a multimeter to measure the resistance between VSSA on a thermistor pin and GND on an endstop pin. It should read no more than a few ohms. If instead it's very high, the VSSA fuse has blown, which will make all thermistors read 2000C.
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Its a V1.01 board and that measurement is 60KOhm so guess the fuse has blown
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@pcsentinel said in Heater Fault:
Its a V1.01 board and that measurement is 60KOhm so guess the fuse has blown
Yes. Find and fix the short between thermistor wiring and something else that probably caused it to blow, then see https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers#Section_VSSA_fuse for how to replace or bypass the fuse.
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Thanks for your help, have now applied full resettable fuse and 10K resistor fix. Funny though as could not find original fault.
Whilst fixing I have also recognised a further issue but as is unrelated I have created a new thread.
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Hi @dc42, i have the same issue as mentioned above. can you eleborate how can i use a multimeter to verify if i have vssa fuse blown? i am pretty sure all wiring are ok and now i am getting open circuit error message. thanks a ton!
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 2.05.1 ELECTRONICS: Duet WiFi 1.0 or 1.01 FIRMWARE_DATE: 2020-02-09b1
@dc42 said in Heater Fault:
Yes, if your Duet is a revision 1.0 or 1.01 then with power off, use a multimeter to measure the resistance between VSSA on a thermistor pin and GND on an endstop pin. It should read no more than a few ohms. If instead it's very high, the VSSA fuse has blown, which will make all thermistors read 2000C.
