Hi Please could you advise, solution I have installed a Silicon Heated 300x300 230V AC 300w with a SSR solid state relay. ( 25A ) Specs on silicon bed is 100K NTC 1% thermistor. In marlin ( 1.1.6 ) I have tried Thermistor no. 1 & 6 & 75 but they all read 90 degrees yet it suppose to be around 28 degrees ( Cold bed ) I plugged in a spare thermistor and reading was correct 28 Degrees ( room temp ) Why is my Thermistor from my silicon heater so high. I did add extension wiring , slightly thicker wiring ?? Please can you help if Marlin is holding it at 90 for some reason or something. Thanks Vaughan https://reprap.org/forum/read.php?1,799055,799055#msg-799055 Fri, 05 Jun 2026 18:20:27 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,799055,799490#msg-799490 https://reprap.org/forum/read.php?1,799055,799490#msg-799490
Thanks for all the help]]> scubi General Tue, 05 Dec 2017 05:39:34 -0500 https://reprap.org/forum/read.php?1,799055,799231#msg-799231 https://reprap.org/forum/read.php?1,799055,799231#msg-799231 Origamib General Sun, 03 Dec 2017 12:18:03 -0500 https://reprap.org/forum/read.php?1,799055,799099#msg-799099 https://reprap.org/forum/read.php?1,799055,799099#msg-799099 6.8Kohm is about 35c.
At 28c they are about 8.5K to 9Kohm.

You can do one thing,, look at the resistance with the multimeter when you heat it up, put the heat on top of a cub of warm water.
The resistance should then decrease.]]> amigob General Sat, 02 Dec 2017 14:50:56 -0500 https://reprap.org/forum/read.php?1,799055,799085#msg-799085 https://reprap.org/forum/read.php?1,799055,799085#msg-799085 The packaging etc says it a 100K NTC thermistor .

I set the multimeter to 200K because my multimeter does not have a 100K point. My room temp is about 28 degrees . The reading on the multimeter is 6.8 ?]]> scubi General Sat, 02 Dec 2017 12:58:57 -0500 https://reprap.org/forum/read.php?1,799055,799073#msg-799073 https://reprap.org/forum/read.php?1,799055,799073#msg-799073 That will be a thermistor type 4 in marlin.]]> amigob General Sat, 02 Dec 2017 11:22:59 -0500 https://reprap.org/forum/read.php?1,799055,799071#msg-799071 https://reprap.org/forum/read.php?1,799055,799071#msg-799071
Mhh, so it is 6.8k at 20c, I will check in the code.]]> amigob General Sat, 02 Dec 2017 11:19:27 -0500 https://reprap.org/forum/read.php?1,799055,799067#msg-799067 https://reprap.org/forum/read.php?1,799055,799067#msg-799067 Sorry it reads 6.8 on the Multimeter]]> scubi General Sat, 02 Dec 2017 11:09:42 -0500 https://reprap.org/forum/read.php?1,799055,799066#msg-799066 https://reprap.org/forum/read.php?1,799055,799066#msg-799066 I don't use marlin my self, but in the code these type seem to be for 200k thermistors]]> amigob General Sat, 02 Dec 2017 11:05:00 -0500 https://reprap.org/forum/read.php?1,799055,799061#msg-799061 https://reprap.org/forum/read.php?1,799055,799061#msg-799061 amigob General Sat, 02 Dec 2017 10:51:05 -0500 https://reprap.org/forum/read.php?1,799055,799060#msg-799060 https://reprap.org/forum/read.php?1,799055,799060#msg-799060 I just tested it and i put the multimeter on 200K and it come out at 6.8 reading ?? Not sure what that means ??]]> scubi General Sat, 02 Dec 2017 10:44:09 -0500 https://reprap.org/forum/read.php?1,799055,799058#msg-799058 https://reprap.org/forum/read.php?1,799055,799058#msg-799058 I have a Multi-meter , using a Ramps 1.4 board . Must check how to measure resistance lol I check now]]> scubi General Sat, 02 Dec 2017 10:35:11 -0500 https://reprap.org/forum/read.php?1,799055,799056#msg-799056 https://reprap.org/forum/read.php?1,799055,799056#msg-799056
What board do you use , Arduino Due ?]]> amigob General Sat, 02 Dec 2017 10:29:42 -0500 https://reprap.org/forum/read.php?1,799055,799055#msg-799055 https://reprap.org/forum/read.php?1,799055,799055#msg-799055 Please could you advise, solution

I have installed a Silicon Heated 300x300 230V AC 300w with a SSR solid state relay. ( 25A ) Specs on silicon bed is 100K NTC 1% thermistor.

In marlin ( 1.1.6 ) I have tried Thermistor no. 1 & 6 & 75 but they all read 90 degrees yet it suppose to be around 28 degrees ( Cold bed ) I plugged in a spare thermistor and reading was correct 28 Degrees ( room temp )

Why is my Thermistor from my silicon heater so high. I did add extension wiring , slightly thicker wiring ??

Please can you help if Marlin is holding it at 90 for some reason or something.

Thanks
Vaughan]]> scubi General Sat, 02 Dec 2017 10:20:13 -0500