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Fabrizio
(@fabrizio)
Active Member
Heatbed temperature flickering with MINTEMP BED alarm

Printer is 10 months old, today heatbed temperature started flickering and sometimes developing a “mintemp bed” alarm for less than a second and then “mintemp bed ok” followed by “please restart”. I saw temperatures flickering from 85 to 78, 55, and either 0 for just a flash of time 

it happens either while during the Z check before printing then after 30-40 minutes in the print.

I thought it was a 3.9.1 issue, so I uploaded the 3.9.0 version with zero improvement.

Any suggestion on what to check to fix the issue?

thanks

This topic was modified 3 years ago 2 times by Fabrizio
Posted : 19/11/2020 4:08 pm
cwbullet
(@cwbullet)
Member
RE: Heatbed temperature flickering with MINTEMP BED alarm

Bed temperature errors are usually a broken wire to the thermistor.   I have had to replace 2 of my 8 printers due to a similar error at 6 months to a year.  

--------------------
Chuck H
3D Printer Review Blog

Posted : 24/11/2020 12:08 am
Fabrizio
(@fabrizio)
Active Member
Topic starter answered:
RE: Heatbed temperature flickering with MINTEMP BED alarm

I came to the same conclusion, spoke to a customer rep a few days ago and got a spare thermistor shipped to me under warranty (printer is 11 months old).

this was the 1st time I had to issue a claim, and I have to say customer support is very effective for this printer.

Posted : 24/11/2020 10:17 am
cwbullet
(@cwbullet)
Member
RE: Heatbed temperature flickering with MINTEMP BED alarm

@fabrizio

I always keep a few extra thermistors on hand.  

--------------------
Chuck H
3D Printer Review Blog

Posted : 24/11/2020 2:21 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: Heatbed temperature flickering with MINTEMP BED alarm

I also had to fight with broken or wobbly thermistor wires. The thermistor itself was never defective. For this reason I bought AWG26 heat resistant and flexible silicone wires and replaced the thermistor wires with these (print bed and hot end). Since 2 years now no cable is broken anymore. I soldered the wires and stripped them with a heat shrink tube. But be careful not to solder too close to the thermistor, otherwise the solder can melt.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen.

Posted : 24/11/2020 2:32 pm
Fabrizio
(@fabrizio)
Active Member
Topic starter answered:
RE: Heatbed temperature flickering with MINTEMP BED alarm

I'll probably do the same, good advise

Posted : 24/11/2020 2:32 pm
Fabrizio
(@fabrizio)
Active Member
Topic starter answered:
RE: Heatbed temperature flickering with MINTEMP BED alarm
Posted by: @karl-herbert

I also had to fight with broken or wobbly thermistor wires. The thermistor itself was never defective. For this reason I bought AWG26 heat resistant and flexible silicone wires and replaced the thermistor wires with these (print bed and hot end). Since 2 years now no cable is broken anymore. I soldered the wires and stripped them with a heat shrink tube. But be careful not to solder too close to the thermistor, otherwise the solder can melt.

could you please tell which wire size you chose for the repair? thanks

 

Posted : 24/11/2020 2:42 pm
cwbullet
(@cwbullet)
Member
RE: Heatbed temperature flickering with MINTEMP BED alarm

@karl-herbert

My issue is usually broken wires near the thermistor / heater block.  Never as lucky as you.  

--------------------
Chuck H
3D Printer Review Blog

Posted : 24/11/2020 3:13 pm
cwbullet
(@cwbullet)
Member
RE: Heatbed temperature flickering with MINTEMP BED alarm

@fabrizio

I have had good success with original E3D Thermistors, but I also use some I purchased from China in 5 a pack.  They seem to be equivalent.  You get 5 for less than 1 and I have not noticed a difference in performance.  

--------------------
Chuck H
3D Printer Review Blog

Posted : 24/11/2020 3:21 pm
Fabrizio
(@fabrizio)
Active Member
Topic starter answered:
RE: Heatbed temperature flickering with MINTEMP BED alarm
Posted by: @cwbullet

@fabrizio

I have had good success with original E3D Thermistors, but I also use some I purchased from China in 5 a pack.  They seem to be equivalent.  You get 5 for less than 1 and I have not noticed a difference in performance.  

took note, seems to be a trouble free solution 👍 

Posted : 24/11/2020 3:29 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: Heatbed temperature flickering with MINTEMP BED alarm

@cwbullet

I am referring more to the area of constant alternating movements, especially at the heating bed. Most of the time the cables are damaged in the clamping area. Of course the hotend thermistor in the area of the heating block is also very sensitive and will break quickly if you are not careful when changing the nozzle.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen.

Posted : 24/11/2020 6:13 pm
cwbullet
(@cwbullet)
Member
RE: Heatbed temperature flickering with MINTEMP BED alarm

@karl-herbert

I did the same on my hotbed.  It continues to work fine after 18 months.  My hotend thermistors are the ones I replace more. 

--------------------
Chuck H
3D Printer Review Blog

Posted : 24/11/2020 11:30 pm
Fabrizio
(@fabrizio)
Active Member
Topic starter answered:
RE: Heatbed temperature flickering with MINTEMP BED alarm

Spare thermistor has arrived and it was installed without problems. Printer back to work smoothly. 

Posted : 25/11/2020 2:05 pm
cwbullet
(@cwbullet)
Member
RE: Heatbed temperature flickering with MINTEMP BED alarm

Good to hear.  As I said above, but not as clear, I recommend you have one bed and one hotend thermistor in a drawer for that rainy day when they break.  

--------------------
Chuck H
3D Printer Review Blog

Posted : 25/11/2020 2:09 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: Heatbed temperature flickering with MINTEMP BED alarm
Posted by: @fabrizio
Posted by: @karl-herbert

I also had to fight with broken or wobbly thermistor wires. The thermistor itself was never defective. For this reason I bought AWG26 heat resistant and flexible silicone wires and replaced the thermistor wires with these (print bed and hot end). Since 2 years now no cable is broken anymore. I soldered the wires and stripped them with a heat shrink tube. But be careful not to solder too close to the thermistor, otherwise the solder can melt.

could you please tell which wire size you chose for the repair? thanks

 

For the thermistor wires look here: AWG 24-26 or similar

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen.

Posted : 25/11/2020 2:26 pm
cwbullet
(@cwbullet)
Member
RE: Heatbed temperature flickering with MINTEMP BED alarm
Posted by: @karl-herbert
Posted by: @fabrizio
Posted by: @karl-herbert

I also had to fight with broken or wobbly thermistor wires. The thermistor itself was never defective. For this reason I bought AWG26 heat resistant and flexible silicone wires and replaced the thermistor wires with these (print bed and hot end). Since 2 years now no cable is broken anymore. I soldered the wires and stripped them with a heat shrink tube. But be careful not to solder too close to the thermistor, otherwise the solder can melt.

could you please tell which wire size you chose for the repair? thanks

 

For the thermistor wires look here: AWG 24-26 or similar

Great find!  They also sell it inshorter lengths.

--------------------
Chuck H
3D Printer Review Blog

Posted : 25/11/2020 3:09 pm
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