Err: MAXTEMP: E1 (no replies)

Hi!

I have had my Rostock MAX V2 Delta printer upgraded with a BigTreeTech SKR 1.4 Turbo. All worked fine until I accidentally broke my hotend thermistor.

I since then bought new thermistors from Amazon and have been trying to get it to work.

The thermistors I´ve bought are these: [www.amazon.de]

To be honest, I didn´t know exactly if these were the best ones, but I figured 100K thermistor should work?
Anyway, I´ve tested the resistance with a multimeter they seem to work and the resistance decreases if I heat them between my fingers.

But when I try different settings in Malin 2.0 configuration.h, I get a "Err: MAXTEMP: E1" error when turining the board on. If I choose 998 (25 degree dummy sensor) for both bed and hotend it boots up ok. But the different 100K thermistor values I´ve tried gives me the same error. The values for the thermistors on Amazon are:

Resistance (R25 ℃ : 100 K Ohm +/-1%
B value: 3950 K +/-1%
Accuracy: ± 1%
Glass packaging: 2,0 +/-0.2 mm; Line Length: 32 mm +/-5 mm

Here are the different presets in Marlin 2.0 as commented in the configuration.h file:

//===========================================================================
//============================= Thermal Settings ============================
//===========================================================================

/**
 * --NORMAL IS 4.7kohm PULLUP!-- 1kohm pullup can be used on hotend sensor, using correct resistor and table
 *
 * Temperature sensors available:
 *
 *    -5 : PT100 / PT1000 with MAX31865 (only for sensors 0-1)
 *    -3 : thermocouple with MAX31855 (only for sensors 0-1)
 *    -2 : thermocouple with MAX6675 (only for sensors 0-1)
 *    -4 : thermocouple with AD8495
 *    -1 : thermocouple with AD595
 *     0 : not used
 *     1 : 100k thermistor - best choice for EPCOS 100k (4.7k pullup)
 *   331 : (3.3V scaled thermistor 1 table for MEGA)
 *   332 : (3.3V scaled thermistor 1 table for DUE)
 *     2 : 200k thermistor - ATC Semitec 204GT-2 (4.7k pullup)
 *   202 : 200k thermistor - Copymaster 3D
 *     3 : Mendel-parts thermistor (4.7k pullup)
 *     4 : 10k thermistor !! do not use it for a hotend. It gives bad resolution at high temp. !!
 *     5 : 100K thermistor - ATC Semitec 104GT-2/104NT-4-R025H42G (Used in ParCan, J-Head, and E3D) (4.7k pullup)
 *   501 : 100K Zonestar (Tronxy X3A) Thermistor
 *   502 : 100K Zonestar Thermistor used by hot bed in Zonestar Prusa P802M
 *   512 : 100k RPW-Ultra hotend thermistor (4.7k pullup)
 *     6 : 100k EPCOS - Not as accurate as table 1 (created using a fluke thermocouple) (4.7k pullup)
 *     7 : 100k Honeywell thermistor 135-104LAG-J01 (4.7k pullup)
 *    71 : 100k Honeywell thermistor 135-104LAF-J01 (4.7k pullup)
 *     8 : 100k 0603 SMD Vishay NTCS0603E3104FXT (4.7k pullup)
 *     9 : 100k GE Sensing AL03006-58.2K-97-G1 (4.7k pullup)
 *    10 : 100k RS thermistor 198-961 (4.7k pullup)
 *    11 : 100k beta 3950 1% thermistor (Used in Keenovo AC silicone mats and most Wanhao i3 machines) (4.7k pullup)
 *    12 : 100k 0603 SMD Vishay NTCS0603E3104FXT (4.7k pullup) (calibrated for Makibox hot bed)
 *    13 : 100k Hisens 3950  1% up to 300°C for hotend "Simple ONE " & "Hotend "All In ONE"
 *    15 : 100k thermistor calibration for JGAurora A5 hotend
 *    18 : ATC Semitec 204GT-2 (4.7k pullup) Dagoma.Fr - MKS_Base_DKU001327
 *    20 : Pt100 with circuit in the Ultimainboard V2.x with 5v excitation (AVR)
 *    21 : Pt100 with circuit in the Ultimainboard V2.x with 3.3v excitation (STM32 \ LPC176x....)
 *    22 : 100k (hotend) with 4.7k pullup to 3.3V and 220R to analog input (as in GTM32 Pro )
 *    23 : 100k (bed) with 4.7k pullup to 3.3v and 220R to analog input (as in GTM32 Pro)
 *   201 : Pt100 with circuit in Overlord, similar to Ultimainboard V2.x
 *    60 : 100k Maker's Tool Works Kapton Bed Thermistor beta=3950
 *    61 : 100k Formbot / Vivedino 3950 350C thermistor 4.7k pullup
 *    66 : 4.7M High Temperature thermistor from Dyze Design
 *    67 : 450C thermistor from SliceEngineering
 *    70 : the 100K thermistor found in the bq Hephestos 2
 *    75 : 100k Generic Silicon Heat Pad with NTC 100K MGB18-104F39050L32 thermistor
 *    99 : 100k thermistor with a 10K pull-up resistor (found on some Wanhao i3 machines)
 *
 *       1k ohm pullup tables - This is atypical, and requires changing out the 4.7k pullup for 1k.
 *                              (but gives greater accuracy and more stable PID)
 *    51 : 100k thermistor - EPCOS (1k pullup)
 *    52 : 200k thermistor - ATC Semitec 204GT-2 (1k pullup)
 *    55 : 100k thermistor - ATC Semitec 104GT-2 (Used in ParCan & J-Head) (1k pullup)
 *
 *  1047 : Pt1000 with 4k7 pullup (E3D)
 *  1010 : Pt1000 with 1k pullup (non standard)
 *   147 : Pt100 with 4k7 pullup
 *   110 : Pt100 with 1k pullup (non standard)
 *
 *  1000 : Custom - Specify parameters in Configuration_adv.h
 *
 *         Use these for Testing or Development purposes. NEVER for production machine.
 *   998 : Dummy Table that ALWAYS reads 25°C or the temperature defined below.
 *   999 : Dummy Table that ALWAYS reads 100°C or the temperature defined below.
 */
#define TEMP_SENSOR_0 1
#define TEMP_SENSOR_1 0
#define TEMP_SENSOR_2 0
#define TEMP_SENSOR_3 0
#define TEMP_SENSOR_4 0
#define TEMP_SENSOR_5 0
#define TEMP_SENSOR_6 0
#define TEMP_SENSOR_7 0
#define TEMP_SENSOR_BED 998  //set to dummy to ease problemsolving 
#define TEMP_SENSOR_PROBE 0
#define TEMP_SENSOR_CHAMBER 0

Does anyone know what could be the problem? Are 100K thermistors so vastly different? Should I buy new thermistors? if so, any recommendations?

Thank you for your help!

Best regards
Rostockdude