PREHEAT ERROR
Uploaded the new firmware & calibrated. Today started a 8H print and needed to adjust the nozzle temperature on the fly using the TUNE menu and then a few seconds later the print aborts with a PREHEAT ERROR.
I was printing at 200º (although the machine had cooled some by the time I had my phone in my hand) and really needed to raise the temperature up to 215º now is that too large a step to make or should I have incremented it in smaller steps? I don't recall having this problem prior to updating the firmware.
Re: PREHEAT ERROR
Ok, so I can repeat this error.
This time I printed the Batman Logo from the SD Card and initially it started at 200º and I increased the temperature to 210º and again after a short while I get the PREHEAT ERROR again and printing stops.
Re: PREHEAT ERROR
So I have dropped the firmware back to 3.0.8 and increasing the Temperature through the Tune menu has no effect on the printer. The temperature increases and decreases fine.
So, maybe this is a bug in the latest firmware?
Re: PREHEAT ERROR
Looks like a bug. If I understand it well, preheat error is kind of thermal runaway check implemented for preheat phase of print, when thermal runaway check is inactive.
Re: PREHEAT ERROR
Hi, today I have upgraded firmware to 3.0.9. and when I doing self-test in calibration I'm getting same error bed is heating normally, going back to old firmware
Re: PREHEAT ERROR
Hi guys, this is the new preheat protection where thermal runaway is not active. It seems it is more strict than we thought it would be.
I uploaded adjusted firmware, where after the printer starts printing the preheat protection is turned off.
It is not a perfect solution. As if you raise the temp during the print and it won't reach the said temp, it will remain in preheat mode and thermal runaway will not be active :-/
Re: PREHEAT ERROR
Hi guys, this is the new preheat protection where thermal runaway is not active. It seems it is more strict than we thought it would be.
I uploaded adjusted firmware, where after the printer starts printing the preheat protection is turned off.
It is not a perfect solution. As if you raise the temp during the print and it won't reach the said temp, it will remain in preheat mode and thermal runaway will not be active :-/
Thanks for the update. In light of this and the at the risk of prints failing I think I'll stay with 3.0.8. Can you give any indication of time before the next version (3.0.10?) will be released?
Re: PREHEAT ERROR
I have experienced this problem and have found that using the print fan while printing higher temp filaments such as PETG can cause this error as the print fan can mess with the thermistor's readings and it thinks that the nozzle can't reach the target temp. Once it struggles to reach the temp for X period of time, the error occurs.
Re: PREHEAT ERROR
My i3 MK2 cannot reach nozzle temperatures higher than 289C without triggering the PREHEAT ERROR. That is without the filament cooling fan running.
For a few prints, I managed to get it going with nozzle temp programmed to 290C first layer and 285C other layers, but now I have to 'Tune' nozzle to 285 during the heat up phase. Once 285C is reached, the target temp changes to 290C and then 290C is reached without PREHEAT ERROR being triggered.
Re: PREHEAT ERROR
I have just assemblied the kit.
Calibration checked but when I try to preheat or load the filament it stops with the preheat error
Bed temperature raises normally to the expected tempeature but the nozzle temperature apparently doesn´t raise from 21degrees
I touched the nozzle and it is really hot, it burns, it is impossible that it remains in 20 degrees.
Can´t print with this problem
Any idea ?
Thanks
Re: PREHEAT ERROR
Now working... just a wire disconnected
Sorry...
Re: PREHEAT ERROR
I too have just completed assembling the kit and passed the self test and calibrations. I attempted to preheat and load filament, but I got the PREHEAT ERROR. The heat bed temp raised like it should, but the hot end temp would not increase at all. I checked all wires and connections. I checked the output voltage to the extruder heater and it was at 12v during preheat. When I checked the heaters resistance, it showed open. I understand it should be around 5 - 6 ohms. I even checked it directly at the heater to discount an open in the wires. Could the heater be bad, or is there something i'm missing? I am running the latest firmware, 3.0.9.
Re: PREHEAT ERROR
I too have just completed assembling the kit and passed the self test and calibrations. I attempted to preheat and load filament, but I got the PREHEAT ERROR. The heat bed temp raised like it should, but the hot end temp would not increase at all. I checked all wires and connections. I checked the output voltage to the extruder heater and it was at 12v during preheat. When I checked the heaters resistance, it showed open. I understand it should be around 5 - 6 ohms. I even checked it directly at the heater to discount an open in the wires. Could the heater be bad, or is there something i'm missing? I am running the latest firmware, 3.0.9.
Did you run the self test?
Ooops, I just re-read your post and noted that it passed the self test. That is strange, either the self test does not detect a burnt-out heater element, or your heater burned out after the self test, or something altogether different.
Can you run the self-test again to see it it passes, and check if the hotend actually heats up and the heat sink fan starts to run when it gets above 50C?
Re: PREHEAT ERROR
Did you run the self test?
Ooops, I just re-read your post and noted that it passed the self test. That is strange, either the self test does not detect a burnt-out heater element, or your heater burned out after the self test, or something altogether different.
Can you run the self-test again to see it it passes, and check if the hotend actually heats up and the heat sink fan starts to run when it gets above 50C?[/quote]
Thanks for responding. Yes, I ran the self test a few different times after rechecking connections and testing wiring. Everything tests OK. I also touched the hot end during Preheat a few times to see if it was getting hot, but it does not even get warm. Never gets above ambient. Oddly, when it displays the Preheat Error, the front fan comes on and stays on until I clear the message. Very perplexing. You would think the selftest would show a failure at the hotend if it was burnt out. Not showing any ohms is very odd for a heating element. I have contacted Prusa Support to see what they can do for me. Failing that, I wonder if I can find a replacement element somewhere here in the US.
Re: PREHEAT ERROR
So this self test error affects both the bed and the hotend heater. See this post also: http://shop.prusa3d.com/forum/prusa-i3-kit-building-calibrating-first-print-main-f6/self-test-bed-bug-t2771.html#p24089
You need a new heating element for the hotend.
Consider getting the 40W one if you want to print polycarbonate, or get the silicone socks sent along with the replacement part.
Re: PREHEAT ERROR
So this self test error affects both the bed and the hotend heater. See this post also: http://shop.prusa3d.com/forum/prusa-i3-kit-building-calibrating-first-print-main-f6/self-test-bed-bug-t2771.html#p24089
You need a new heating element for the hotend.
Consider getting the 40W one if you want to print polycarbonate, or get the silicone socks sent along with the replacement part.
Thanks for the link. That is a nasty bug. I wonder how mine broke or burnt out. The test slip that came with the kit showed the hotend test OK @ 240 C. I ended up ordering a 40w from Matterhackers before reading your post. We'll see how that one works.