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Hi
A couple of days ago the hotend wouldn't heat up and i got a couple of errorcodes/warnings in the display. The bed heats up just fine, so i ordered a new hotend parts (heater, thermistor and a new aluminum block). Changed all of this, but still the same error. I can se that the thermistor works because it changes values in the display when touching the thermistor-end. Any good ideas why the heater doesn't heat?
Honestly $80 sounds like an absolute bargain, you straight up can't build one yourself for that price, a mainboard and like 2-3 steppers would go over that and everything I've seen about that printer says it's a very capable, budget friendly option. It looks like that's using a btt mainboard which I totally swear by, straight up shorted a fan header on an octopus pro and it's still chugging along just fine, anecdotally they're pretty hard to kill.
I'd totally check your wiring before replacing a board, a break or bad crimp could totally be your culprit here, and those are a heck of a lot less work to remedy, thermal protection does totally get tripped if there's an intermittent fault with the thermistor (including cabling), I had it happen on a prusa where it'd kick out but not have anything obvious temp wise on the display, only noticeable in a temp plot.
The thermistor temperature reacts to me touching the thermistor-end. This shows in the display- So i believe this is not the problem here..
Fair, a wire break can be annoying though, often they're intermittent, and the display often doesn't respond fast enough to show that, but thermal protection will.
I'd totally consider taking a look at the connectors to the board for the heater cartridge, see if there's good contact being made, check for any signs of things like scorching check end-end continuity. Looking at the schematics for that mainboard Btt skr 1.4 it looks like there are LEDs on all of the MOSFETs, it will give you a visual indicator of the board state, to help narrow down your troubleshooting.
Thanks for the links. Can't see any scorching, and everything I've measured seems OK. If there are LED's on the mainboard, i don't know how to light them. As of now there are no lights on the motherboard, but everything beyond that heater works..