¶ What it is
During the heatbed heating process, the printer strictly monitors the machine's internal state. When the printer detects that the heating status of the heatbed does not meet expectations (such as AC control cable disconnection, AC board failure, heatbed cable cracking, heatbed failure, etc.), the printer will stop heating to ensure system safety and display a message indicating a potential heatbed malfunction.
¶ Troubleshooting
If this error occurs, please immediately stop using the printer and turn off the printer's power to ensure safety.
¶ A1 Series
-
Replace the AC board
A1
For A1 mini, it is similar to replace the mainboard. -
Replace the MC board
For A1 mini, it is similar to replace the mainboard.
For A1 mini, it is similar to replace the mainboard.
¶ X1 & P1 Series
In this scene, the power supply of the heat bed is generally abnormal, which causes the heat bed to fail to heat.
¶ Safety warning and Machine state before starting operation
1. The heat bed is directly heated by mains electricity, and there is a danger of high voltage. It is necessary to ensure that troubleshooting is carried out with the power off.
2. Set the heat bed to a middle height from the LCD screen when the printer is still powered on.
¶ Tools needed
- H1.5 & H2.0 Allen key
- Tweezers
- Hair Dryer
¶ Troubleshooting suggestions
1. Check the connection status of the heat bed power cable;
2. Check the output of the AC board (High voltage, electrician basics are required)
¶ Operation guides (disassembly & inspection)
¶ Step 1 - Remove the rear cover screws
NOTE: There are a lot of screws involved in this procedure. Please label them and group them in separate sections to avoid issues.
Remove the 10 screws and 4 screws from the rear cover shown in the picture. There are 2 types of screws, so keep them separate and remember which ones go where.
 |
 |
¶ Step 2 - Remove the rear cover
Remove the rear cover by unlocking the left side belt tension port first, and then the right side one to avoid getting stuck.
 |
 |
¶ Step 3 - Remove the excess chute
Remove 2 screws, and remove the excess chute.
 |
 |
¶ Step 4 - Remove the power module protective cover
Remove the 6 screws shown, move the power module protective cover to the side, and disconnect the power cable of the heat bed from the AC power board.
 |
 |
¶ Step 5 - Check the 2PIN cable and its connection
After confirming that the 2 pins are normal, reconnect the power cable to the AC power board. Temporarily connect the power cord to start the printer, and set the bed temperature to confirm whether the problem is solved. If not resolved, after disconnecting the power cord, proceed to the next step.
 |
 |
Reminder: If you have a multimeter at home, you can also test the resistance value of the two pins. Under normal circumstances, the resistance value is about 50~60 ohms. If the resistance value is not displayed, the power connection at the heat bed end is likely open or the internal components of the heat bed are burned out.
¶ Step 6 - Check the power cable connection under the heat bed
WARNING: Always confirm that the power supply is disconnected before operation.
Because the connector is usually glued with white silicone gel, it may not be directly clear whether the connection is normal. Just use the tip of the tweezers to push the connector several times. After the pressing, connect the power to start the printer and set the bed temperature to confirm whether the problem is solved. If the problem is not resolved, continue to the next step to check the AC board.
 |
 |
¶ Step 7 - Check the appearance of the AC power board
Visually check the appearance of the AC board, including shaking the input cables to check whether they are loose (if loose, reconnect and fix them) and whether the components on the board have obvious burn marks (if there are, please refer to this wiki to replace the AC power board ). Confirm that there is no abnormality, then proceed to the next step to confirm.
¶ Step 8 - Check AC board voltage output
WARNING: ⚡Shock Hazard⚡ - Can cause serious injury or death. This operation detects the mains voltage, and it is not recommended for personnel without relevant knowledge to operate. Skip this step if you don't know what you're doing.
When the printer is turned on, and the heatbed is heating, use the AC voltage test file of the multimeter to check the output voltage, which should be the same as the local voltage. If the output voltage is abnormal, the AC board is faulty. Please refer to this wiki to replace the AC power board.
 |
 |
If the above operation fails to eliminate the fault, you need to contact the service team for confirmation.
¶ Assembly
After troubleshooting, the dismantled parts need to be reassembled. The steps are as follows:
¶ Step 1 - Install the power module protective cover
Install the power module protective cover, and secure it with the 6 screws.
¶ Step 2 - Install the excess chute
Install the excess chute, pay attention to the buckles on both sides and use the 2 screws to secure it.
 |
|
¶ Step 3 - Install the rear cover
Pass the PTFE tube through the tube bracket, first install the right-side belt tension port, then the left-side to install the rear cover.
|
 |
¶ Step 4 - Install the 10+4 screws
Install the 10 + 4 screws (see picture).
|
|
¶ Error Message
HMS_0300-0100-0001-0008: An abnormality occurs during the heating process of the heatbed. The heating modules may be broken.
"An abnormality occurs during the heating process of the heatbed. The heating modules may be broken."
0300-0100-0001-0008
¶ End Notes
We hope the detailed guide provided has been helpful and informative.
To ensure a safe and effective execution, if you have any concerns or questions about the process described in this article, we recommend submitting a Technical ticket regarding your issue. Please include a picture or video illustrating the problem, as well as any additional information related to your inquiry.