Marlin throwing a MAXTEMP error when I try to connect

i am making some mods to my Cartesian printer and have tried to calibrate the z motors.. I first used an older version of Marlin (don't remember the version) and tested that the motors worked. I connected fine. I then downloaded and configured the latest and greatest version of Marlin, uploaded it and now I can;t connect. The only things I have connected at this point are the Z motors and the power input. I remebered that there were problems trying to connect with no thermisters connected so I went ahead and connected the thermisters (even though the hotend and bed heaters are not connected yet. Still no go.
Below is the error I get. I tried setting the bed temp higher, to zero and neither helped.

Here is the output I am getting....

Connecting...
start
Printer is now online.
echo:Marlin 1.1.0-RC7
echo: Last Updated: 2016-07-31 12:00 | Author: (none, default config)
Compiled: May 1 2019
echo: Free Memory: 5396 PlannerBufferBytes: 1232
echo:Hardcoded Default Settings Loaded
echoteps per unit:
echo: M92 X78.74 Y78.74 Z533.33 E836.00
echo:Maximum feedrates (mm/s):
echo: M203 X300.00 Y300.00 Z5.00 E25.00
echo:Maximum Acceleration (mm/s2):
echo: M201 X3000 Y3000 Z100 E10000
echo:Accelerations: P=printing, R=retract and T=travel
echo: M204 P3000.00 R3000.00 T3000.00
echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s), Z=maximum Z jerk (mm/s), E=maximum E jerk (mm/s)
echo: M205 S0.00 T0.00 B20000 X20.00 Z0.40 E5.00
echo:Home offset (mm)
echo: M206 X0.00 Y0.00 Z0.00
echoID settings:
echo: M301 P22.20 I1.08 D114.00
echo:Filament settings: Disabled
echo: M200 D3.00
echo: M200 D0
Error:MAXTEMP triggered, system stopped! Heater_ID: bed
[ERROR] Error:MAXTEMP triggered, system stopped! Heater_ID: bed

Errorrinter halted. kill() called!

[ERROR] Errorrinter halted. kill() called!

not sure why this forum is replacing P's with the smiley faces but don't think that has anything to do with anything.

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If I haven’t screwed it up yet, I’m not thinking hard enough!

CoreXY, Titan Aero, Duet WiFi, custom design and build
Cartesian, E3D v6 hotend, Bondtech QR extruder, custom design and build

Quote

echo:Marlin 1.1.0-RC7

That is not the latest and greatest version of Marlin - in fact it's a very old version (almost 3 years old). Marlin is up to 1.1.9 on the 1.1.x branch and is also available on a 2.0.x-bugfix branch.

I would test with the latest bugfix-1.1.x branch of Marlin (https://github.com/MarlinFirmware/Marlin/archive/bugfix-1.1.x.zip) and see if you get the same problem.You'll probably have to carefully transfer your settings from 1.1.0-rc7 to bugfix-1.1.x - don't just copy the Configuration.h and Configuration_adv.h files willy-nilly!

Sheesh.... I ended up with several versions of marlin over the years and apparently I got them mixed up. I will try and download what you suggested. I am pretty sure I wrote down everything that I changed... but then, I also thought I knew which version I was running.

Thanks

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If I haven’t screwed it up yet, I’m not thinking hard enough!

CoreXY, Titan Aero, Duet WiFi, custom design and build
Cartesian, E3D v6 hotend, Bondtech QR extruder, custom design and build

Installing Bugfix-1.1.x. worked for the MAXTEMP error I was gettiing, but I have a different issue now. I can move all axis in the positive direction, but not negative. I didn’t have any end/stops connected yet, so I connected the Z min e/s, but it didn’t make any difference. Can only move it up, not down.

Is there another setting that might cause this?

I just thought, I am using a two wire e/s lever switch. I have it hooked to signal and ground. Is that correct? If not, the switch might still be seen as triggered. Possible? (BTW, this is on a Mini Rambo controller)

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If I haven’t screwed it up yet, I’m not thinking hard enough!

CoreXY, Titan Aero, Duet WiFi, custom design and build
Cartesian, E3D v6 hotend, Bondtech QR extruder, custom design and build

You need working endstops, and they should be wired so that they are normally closed (pressing the switch opens them)

Actually, I fonnd the problem in the configuration file. I had somehow commented out the line that I needed in the endstop inversion settings.

Thanks.

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If I haven’t screwed it up yet, I’m not thinking hard enough!

CoreXY, Titan Aero, Duet WiFi, custom design and build
Cartesian, E3D v6 hotend, Bondtech QR extruder, custom design and build