Maybe my prev post too long CAN A HEATER ON HOT END GO BAD??

[Gambo]

That the heater warmed up at all puzzles me 0 ohms is a short circuit should shut the power supply down !So can that measurement be in error, if not change the heater unit . If the measurement is in error the only likely thing is a curruption of the heater control software is my view

[Bruce19]

JUST FYI Hot end heater if set it for 160 or anything less heats up as it should. When it gets above 161 danger zone LOL So Im thinking if a short then it would give warning from 1 degree. If its temp sensitive when some part heats up spmethin stops because heating stops rising and few sconds later "heater Failed Printer Stopped Please reset" I think Ill order new heater barrel

[Gambo]

Hi I am not sure about the ender 3 but the marlin software on my Saffire pro has a safety feature which checks the rate of change of the nozzle temperature and if it goes outside a given range gives a similar error to that you are seeing in my case err7

[Bruce19]

Latest I had noticed from yesterdayI had Ohm meter set on 200k. So today I change meter setting to 200 ohm AND i got a reading of 19.5 ohms So now Im thinking wires close to heater block causing them to move or shift??? Have to look into

[curious aardvark]

well I'd swap the heater cartridge anyway, they're cheap.

Also did all this start when you fitted the new thermistor ?

Always look for 'cause and effect' when trouble shooting.

Could be incorrect settings in firmware, or just dodgy parts.

[Bruce19]

These two feel Metalic like crimped wires. Pulled apart have same resistance of 19.5 ohms. I can imagine that close to heater they heat up a bit and move closer? I have some tapcan tape Im going to put a piece between those two. And in answering your question did this start when thermistor was changed? NO, I changes thermistor thinking it was the culprit. It started lil after changing 235 x 235 carriage bed to 300 x 300 but still used smaller bed heater (235 x 235) for the time being as didn't yet haf full size heat bed

[Gambo]

Silly suggestion have you tried to turn the bed plate temp right down ,!!

[Bruce19]

Well that wasnt the cause WTF I had the bed set for 60 and noxxle 203 failed shut down restart JUST nozzle heat to 160 and at 158 Failed

[Bruce19]

im Thinking on ordering a new heater cartridge new

[curious aardvark]

Okay using homesian deduction.

Problem started after major hardware change.
logical deduction: you caught or damaged something during the operation.
conclusion: replace the non-functioning part - carefully :-)