1 Topic by Robny

  • Robny
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  • Registered: 2014-08-25
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Topic: MK2B Bed/Thermistor Question

Hi All

Please help, I have switched the board on my Press to MK2B and wired in a new thermistor, the board seems to get hot just fine but for some reason the temperature is showing 100 degrees +/- a few degrees before even heating the bed, I have checked the thermistor wiring, and all is insulated and seems in place, the thermistor reads 105ohms with the meter so should be the correct one.

Please can someone offer some guidance?

Many Thanks

2 Reply by Crucial

  • Crucial
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  • Registered: 2015-01-30
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Re: MK2B Bed/Thermistor Question

You might need to flash your board with a fixed firmware, now what firmware changes to be made I have no idea

3 Reply by carl_m1968

  • carl_m1968
  • carl_m1968
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Re: MK2B Bed/Thermistor Question

Robny wrote:

Hi All

Please help, I have switched the board on my Press to MK2B and wired in a new thermistor, the board seems to get hot just fine but for some reason the temperature is showing 100 degrees +/- a few degrees before even heating the bed, I have checked the thermistor wiring, and all is insulated and seems in place, the thermistor reads 105ohms with the meter so should be the correct one.

Please can someone offer some guidance?

Many Thanks


If it is a standard 100K thermistor then it should read 100K at or near room not 105. If it is reading 105 it is shorted.

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4 Reply by Robny

  • Robny
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Re: MK2B Bed/Thermistor Question

Thanks for the info, will check it out