Error maxtemp bed

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ERR. MAXTEMP BED help

just got the geeetech i3 pro b and i had a few problems with it (no instructions manual, my control panel is a new white board all i can find help on is the old red board, I had to re drill a few holes) but i finally got it built, plugged it in and turned it on and the lcd reads ERR MAXTEMP BED what do i do? there are 4 wires all red, 2 coming from the extruder and one coming from the heat bed and no ware can i find what to do with them! (all tutorials are for the red board) Halp!

Re: ERR. MAXTEMP BED help

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by Sherry » Fri Jul 10, 2015 1:59 pm

what’ the type of your main board,ii it gt2560(refer to the attachment)? ,i think you may connect the heating wire of extruder to hot bed ,so LCD shows the ERR MAXTEMP BED.the wire connection please refer to the folowing link.
http://www.geeetech.com/wiki/index.php/GT2560

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Re: ERR. MAXTEMP BED help

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by TundraGeek » Sat Jul 11, 2015 4:37 am

According to this image I have done all my wiring correct but i still get a bed temp error

Re: ERR. MAXTEMP BED help

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by rickr » Mon Aug 10, 2015 9:11 am

Re: ERR. MAXTEMP BED help

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by Mark » Mon Aug 10, 2015 10:04 am

Re: ERR. MAXTEMP BED help

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by rickr » Thu Aug 13, 2015 9:47 am

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Re: ERR. MAXTEMP BED help

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by Mark » Thu Aug 13, 2015 11:15 am

Hope you solve your problems soon and print your first master piece!

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   So, I had just finished one print and was getting ready to start a second when I got a MAXTEMP BED error. The bed temp reads 233. The temperature stays the same even with the bed cable unplugged at the board. I have also tried a backup bed and there is still no change to the temp. So, here are my questions:

   1) Am I correct in thinking this is likely due to a Ramps board failure?
   2) If the Ramps needs replacing does it make sense to go ahead and switch to a generic?
   3) Are there any recommendations for good replacement option or versions to avoid?

   Thanks

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   Yes sounds like a ramps failure (thermistor selection shorted) if unplugged the bed shows the same and a new bed plugged in shows the same.

   I personally think its worth swapping to a generic if you are able to relocate some wires, do some stripping and trimming etc. If that makes you uncomfortable reach out to robo for a R1+ direct replacement (they are the only ones who have them, and may not be in stock? no idea)

   I just buy from amazon. Get a few, if ones bad, return it.

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   Thanks! Robo has the Ramps+Arduino for $100 and that seemed pretty expensive for the convenience of drop-in replacement, especially if it’s unlikely this will be the last Ramps I ever replace. Sounds like a generic is the way to go.

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   yep been around that price since release (one of the main reasons we did the thread). Just outrageous when compared to a generic. You can buy a ramps, arduino, stepper drivers (jumpers included as are heatsinks), LCD controller and wires as a kit for around 40.00

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   Well, my new Ramps board(s) arrived today so I immediately got working on installing a new one. I had everything but the fans and LEDs hooked up so I thought I would turn the printer on to make sure I didn’t have anything wired incorrectly. Lo and behold, I’m still getting bed temp error, even with the thermistor disconnected. The only conclusion I can make is that it’s my Arduino board that’s bad rather than the Ramps. Is there something else I might be missing?

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   I don’t think I’ve left anything out but that’s why I figured it would be good to double check my thought process. In my mind there are only 3 possible culprits — the RAMPS, the Arduino and the thermistor. I had ruled out the thermistor because I still got the overtemp (233C) even with it disconnected, rather than the 0C that I expected. I also tried plugging it into the extruder thermistor location on the board and it read properly there. Taking your suggestion, I just now checked its resistance and it reads 92.8K ohms. I’ve got a new Arduino coming tomorrow so hopefully that fixes the problem. Until then, does it sound unusual for the Arduino to fail, rather than the RAMPS? I’m also trying to figure out if the failure could have somehow been caused by my doing. Is there anything potentially problematic with periodically removing the bed to clean it? I didn’t think heater and thermistor connections would be particularly sensitive.

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    The RAMPS is the usual suspect when I/O failures occur, but it is not unheard of for the Arduino to go bad (and when you are talking an Analog input port it is even less unusual).

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    Nope, that is totally fine as long as you are not doing anything silly I would not expect this to cause failures.

    The ugly «Secret» is that this printer uses commodity electronics (which is why you can buy the entire lot of electronic guts, for < $50 in a kit, on Amazon). Commodity parts are exactly that… they can die Last time I went in to troubleshoot a stepper driver that was bad (and it was) the RAMPS and the Arduino died as well. Bear in mind that they do NOT use actual branded Arduino Mega 2560 units, but made in China clones.

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    The Good news out of all of this is :

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    Well, after enduring one more setback (my new board delivered to somebody a couple houses up the street) I finally was able to install a new Arduino and that seems to have taken care of my maxtemp error on the bed. So, to summarize:

    1) printer would not print, due to MAXTEMP BED error (bed temp was reading 233C, even with bed disconnected)
    2) RAMPS board was likely suspect, since bed wiring and thermistor tested fine
    3) installed new generic RAMPS board but it did not solve the problem
    4) installed new Arduino and now everything seems to be functioning properly

    Thanks again for all of the help!

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Error MAXTEMP BED

Re: Error MAXTEMP BED

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by William » Thu Jan 16, 2020 9:37 am

Hi, If you unplug the hot-bed wire from the motherboard,
If the temperature still shows high temperature,
May be a problem with the motherboard.

-Keep your mind and try to test it.
-Everything will be fun！-Support all Getech printer.
-You can ask me the questions and I will kindly reply.
-Respect others is the best way you can get help!

Re: Error MAXTEMP BED

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by bermo96 » Thu Jan 16, 2020 11:24 pm

Ok thanks for the reply. It does mean that my motherboard is bad then.