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Bed Thermistor not functioning  

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yuling.z
(@yuling-z)
New Member
Bed Thermistor not functioning

I have prusa i3 mk2/s.
So, last night, I noticed that when i was printing, the bed temperature kept changing from 60C (which i wanted) to 26C for no reason. This caused the print to fall off the bed in the middle of print. After that, When I tried again, the bed heated up with no issues.

NEXT DAY
I try to heat up the bed to 60C. No matter how much I heat it, the LCD tells me that the bed temp has not changed, even though It did heat up. Then, it tells me the bed preheat failed.
Later, I do the selftest, and it tells me that the bed thermometer does not work.
In response to this, I looked at all the help guides. I checked the connections on the miniRAMBO, and the tape on the bottom of the heatbed.

The bed thermistor still does not work. 😳 😡
Basically, my bed can heat up, but when it does, the thermostat does not notice any temperature change. I have looked at all the connections, and there is no problem.

Does anybody know what the issue is, and how I can fix it?

Thanks.

Postato : 23/06/2018 11:22 pm
BillC
(@billc)
Reputable Member
Re: Bed Thermistor not functioning

The change in indicated temperature during printing is typical of a broken wire on the thermistor. The long term solution is to buy and fit a new thermistor. As a temporary solution, slowly check the full length of the wire looking for a break. Repair any you find and refit the thermistor to resume printing.

When this happened to me it was just after assembly and Prusa shipped me a free replacement. I then made a list of replacement parts - thermistors heater cartridges, additional nozzles - and bought all at once to offset the Prusa shipping costs.

Bill
Tagaytay City, Philippines
Founder member of Philippines Prusa Printer Owners FB Group
Sponsor Pillars of God Academy in Bacoor

Postato : 24/06/2018 5:20 am
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