This message is shown when, during the preheat, the printer does not increase more than 2 ºC for 20 seconds. The heating is paused so the issue can be fixed.
How to fix it?
CORE One L
Do not access or remove panels or disassemble components on the heatbed and surrounding parts, including cables, as this can pose a safety risk due to electronics.
Report the issue to our 24/7 technical support, and we will guide you through the next steps.
CORE One, MK4/S, MK3.9/S, MK3.5/S
Make sure that the ambient temperature where the printer is is stable, and above 18 ºC.
This error can be caused by damage to either the heatbed thermistor or the heatbed power cable.
Doing regular maintenance on the printer may prevent this type of issue.
On the heatbed, check the following:
See if the thermistor is firmly seated below the Golden Kapton tape.
Make sure that the washer is screwed above the round cable connector, not below it.
Check if the M3nN nut is holding the screw firmly.
In case all the items are correct, there might be an internal break in one of the cables. If you do not have a multimeter, it is possible to check the cables using the following test:
Use a hairdryer to blow hot air at the heatbed.
While doing that, check if there is any temperature change on the LCD screen.
If there is a positive temperature change it means that the heatbed thermistor is working. In this case, the heater is defective.
If there is no change at all, the heatbed thermistor is defective.
Multimeter check
In case you have a multimeter available, it is possible to check the resistance of the cables using the Multimeter usage guide.
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Found the problem was insufficiently tightened screws on the M3 terminal screws (despite them appearing ok at first glance). I must state however they were moderately tight and the printer has worked fine for 12+ months. The problem has only seemed to arise after i did a hot ABS print for the first time-indicating that thermal cycling loosened the screws. A remedy to this would be adding spring washers which I intend to do. You need to remove the torx screws on the bed to lift it up and access the nylocs on the other side of the heatbed to tighten. Only takes a couple of mins with the right tools.
My new MK4S has been going well so this error is quite surprising. The only thing I did different in the error producing print was 'goose' the heated bed with a hair dryer to speed its get-up-to-temp, stopping when the reading was 95 out of the 100 degree target. The print, a small one, got half way before stopping dead in tracks with the error. There's no getting out other than using Control to raising the extruder and then turning off power. Could it have been my hair dryer/impatience?
The error-message is quite misleading, so here are a few hints that might save you a lot of time for troubleshooting!
1. Is it a SMALL object you are trying to print? If so, chances are you get a false-positive error warning! There are some answers right here about this problem, so I'll keep it short: Try to reduce cooling (often times your heat-end cooler simply works too good for very small objects (in my case 10x10x10 mm)). Try to print a larger print first - if you do not get the error then, chances are you suffer this exact type of error.
2. Before checking the heatbed cables, check your thermistor - because you can do this with everything assembled! Take a heatgun or hairdryer, and start the printer. As soon as you see the heatbed temperature in the display start the heatgun. If the value changes within a reasonable amount, you almost certainly can rule out the thermistor.
3. Next look at your heatbed cables. You can check two things without disassembling too much: a) are the red and black wire connected properly? b) is the thermistorcable connected properly? Are all three cables firm and tight? Give the thermistor a careful pull - if it doesn't move, you're good to go.
Usually one of the elements under 1 to 3 is the culprit. If not, there is always the chance something on the xBuddy-Board might be broken.
Pretty sure my problem was the red / black connectors to the head bed weren't tightened all the way.
It's possible I was too delicate with them during the initial build. Another possibility, is that the table my printer was on originally was wobbly. Might have rattled the screw loose.
Regardless, cranking down those two connectors (which unfortunately required unscrewing the heat bed, and having my wife clamp the nut in place while I tightened, very difficult!) seems to have fixed the problem. 2 hours into a 3.5 hour PLA print with no error codes thrown my way.
New kit CoreOne. Doing the automatic calibration, the bed heats up then faults out. I manually ran the bed up to 120. It got there, held, and followed temp set points back down.
The thermistor and heater work.
The problem seems like the speed of changing temp.
11 comments
The problem has only seemed to arise after i did a hot ABS print for the first time-indicating that thermal cycling loosened the screws. A remedy to this would be adding spring washers which I intend to do. You need to remove the torx screws on the bed to lift it up and access the nylocs on the other side of the heatbed to tighten. Only takes a couple of mins with the right tools.
Could it have been my hair dryer/impatience?
The error-message is quite misleading, so here are a few hints that might save you a lot of time for troubleshooting!
1. Is it a SMALL object you are trying to print?
If so, chances are you get a false-positive error warning! There are some answers right here about this problem, so I'll keep it short: Try to reduce cooling (often times your heat-end cooler simply works too good for very small objects (in my case 10x10x10 mm)).
Try to print a larger print first - if you do not get the error then, chances are you suffer this exact type of error.
2. Before checking the heatbed cables, check your thermistor - because you can do this with everything assembled!
Take a heatgun or hairdryer, and start the printer. As soon as you see the heatbed temperature in the display start the heatgun. If the value changes within a reasonable amount, you almost certainly can rule out the thermistor.
3. Next look at your heatbed cables. You can check two things without disassembling too much:
a) are the red and black wire connected properly?
b) is the thermistorcable connected properly? Are all three cables firm and tight? Give the thermistor a careful pull - if it doesn't move, you're good to go.
Usually one of the elements under 1 to 3 is the culprit. If not, there is always the chance something on the xBuddy-Board might be broken.
It's possible I was too delicate with them during the initial build. Another possibility, is that the table my printer was on originally was wobbly. Might have rattled the screw loose.
Regardless, cranking down those two connectors (which unfortunately required unscrewing the heat bed, and having my wife clamp the nut in place while I tightened, very difficult!) seems to have fixed the problem. 2 hours into a 3.5 hour PLA print with no error codes thrown my way.
Doing the automatic calibration, the bed heats up then faults out.
I manually ran the bed up to 120. It got there, held, and followed temp set points back down.
The thermistor and heater work.
The problem seems like the speed of changing temp.
Ideas or solutions?