Heater 0 fault: exceeded allowed temperature excursion
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I got this error twice in the last day in the same spot on the same print file, about 7 layers in. The target was 250.0°C and actual 234.4°C. All connections are intact. I'm wondering if this is the thermistor or the heat rod. I'm on firmware 3.4.4.
I just went through several prints in the prior days without issue.
Does anyone have any suggestions?
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@mlaustin6 said in Heater 0 fault: exceeded allowed temperature excursion:
the same spot on the same print file
Is there something about that spot? Does the fan kick in? Is there some feature of the print that causes the fan to have more effect? Higher extrusion rate causing a temp drop?
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@mlaustin6 said in Heater 0 fault: exceeded allowed temperature excursion:
I got this error twice in the last day in the same spot on the same print file, about 7 layers in. The target was 250.0°C and actual 234.4°C. All connections are intact. I'm wondering if this is the thermistor or the heat rod. I'm on firmware 3.4.4.
I just went through several prints in the prior days without issue.
Does anyone have any suggestions?
Most likely the part cooling fan coming on and too much cold air being blown over the nozzle. However, can you post your full config.g file please. The reason I ask is that heater 0 is usually the bed heater yet the temperatures you mentioned are those that one would expect for a hot end. I suspect that you have configured the heaters in a different way to the norm but we need to be sure which heater is actually showing a fault condition.
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@Phaedrux said in Heater 0 fault: exceeded allowed temperature excursion:
Is there something about that spot? Does the fan kick in? Is there some feature of the print that causes the fan to have more effect? Higher extrusion rate causing a temp drop?
No. It is the beginning of a top layer on one of the parts. The prior runs before this file had the fans going for 75% of the print without issue.
@deckingman said in Heater 0 fault: exceeded allowed temperature excursion:
Most likely the part cooling fan coming on and too much cold air being blown over the nozzle. However, can you post your full config.g file please. The reason I ask is that heater 0 is usually the bed heater yet the temperatures you mentioned are those that one would expect for a hot end. I suspect that you have configured the heaters in a different way to the norm but we need to be sure which heater is actually showing a fault condition.
My apologies. It was H!. The hottest my bed needs is 80 degrees Celsius.
I'm thinking it's either the heater itself or the thermistor is going bad. I have extra thermistors so I can check that first. Just a bit of a pain to replace which is why I asked here.
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@mlaustin6 A common cause of intermittent heater faults is a bad connection (usually a bad crimp) which makes and breaks as the print head moved around and the cables flex.
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@mlaustin6 What does the temperature graph look like when you get this error? Usually if it is a bad connection or a bad thermistor the temperature reading will vary very rapidly (much more so then it is possible to change the actual temperature of the extruder).
If this is happening at the top layer it may be that you are getting the cooling air from the part cooling fan blowing back off that (flat) top layer to the extruder and causing the temperature to drop. Again the shape of the temperature graph may give you a clue. If you see the temperature start to drop as it prints this layer try manually reducing the cooling fan and see if that helps, if it does that would point to the problem being the fan cooling the extruder (in which case a sock or something similar might help).
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I used my multimeter to check the thermistor, and it was good. I ended up redoing all the crimps on the heater line, and it is back up and running again. I did not see any loose connections. Maybe one of the connectors was bad. I replace the hotend with mini Tamiya connectors. Thanks for the guidance.
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