Bed Heating Failed, Printer Halted, Please Reset


A couple of weeks ago I have successfully built a 3D Printer and Printed an XYZ Calibration Cube with ABS material at bed temperature 80 °C.

Next Day I tried bed heating at bed temperature 80 °C,

Screen is blank

and it's not heating at all and showing Following error.

Bed Heating Failed Printer Halted Please Reset

Specification board

I use a RAMPS 1.4 running Marlin 1.1.X


I searched on Google and tried possible solutions but they are not working.

  1. I changed the thermistor and nothing happened, the old thermistor is also showing the same temperature.
  2. I connected 12V Supply Positive to SMPS (Switched-Mode Power Supply) and Negative to RAMPS 1.4 and not working
  3. I checked the Voltage at heat bed it's showing zero in spite connecting to SMPS

Please let me know how can I fix the problem?

I have blank image after pressing 80 °C

Mallikarjun Talagade

Posted 2019-02-04T13:32:22.127

Reputation: 11

I have installed Marlin 1.1.x firmware.

When It's powdered it'll display properly but when I select Bed Heating Option It becomes like a shown in the image and after 30 to 50 seconds later it displays message Bed Heating Failed Printer Halted Please Reset

Except Bed heating everything working fine – Mallikarjun Talagade – 2019-02-04T18:47:18.207

1What happens if you set Bed Temp to, say, 40 Degrees C? Does it warm at all before throwing an error? – Carl Witthoft – 2019-02-04T20:25:31.710

No, Warming. The LCD Temperature won't change at all from Room Temperature i.e 25 Degrees Celcius. – Mallikarjun Talagade – 2019-02-05T01:56:40.313

Why not attach your PSU directly to the bed, will it warm up? If it does the bed is working then check cables, connectors of the setup. – 0scar – 2019-02-05T11:00:01.530

When I connect Heated Bed directly to SMPS it's working but when I connect it to RAMPS board it's not working and the screen is becoming blank – Mallikarjun Talagade – 2019-02-12T07:39:15.757



Check that your heated bed is still working:

  • Measure the resistance of your heated bed. It depends an the power rating of the bed, but 12V beds usually have values <3 Ohms. That's hard to measure for cheap multimeters, but you just need to check that it's not MOhms which would indicate a broken heated bed.
  • Your heated bed could also have a short. That's hard to measure, as <3Ohms are already 'almost a short'. You'll only notice because your bed will not get warm, but the wires, connectors and elements on the RAMPS will get even hotter. Marlin should detect this and switch off after a few seconds.
  • Check your thermistor. Seems you already did that.
  • Check your RAMPS by measuring the voltage on the bed connector while setting the bed to heat up. You should see 12V, at least in the frist few seconds.


Posted 2019-02-04T13:32:22.127

Reputation: 121

Heated Bed is working. when I connect directly to 12V SMPS but it's not working when I connect it to RAMPS 1. 4 – Mallikarjun Talagade – 2019-02-08T01:49:53.770