Bad Thermistor in Hotend?
When I start up my MK4 the live temperature reading for the hot end reads around 22o °C, while the hot end is room temperature and it stays room temp when I attempt to preheat the system for printing with PETG.
Is this a bad thermistor that needs to be replaced or is there some other trouble shooting I can attempt? This is pre-built system less than year old.
RE: Bad Thermistor in Hotend?
Shine a hot hair drier on the hot end see if the temperature changes, if it does, the chances are your thermistor is good,
when you instruct the hot end to heat, does the hot end temperature change? If not the heater is probably disconnected from the socket or faulty...
it could be a broken wire on the heater itself or in the wiring bundle between the controller and the buddyboard, or faulty connectors... or the heater block may be faulty..... Worst case, the Mosfet on the controller board may be faulty...
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK
RE: Bad Thermistor in Hotend?
I'm pretty sure the heater isn't cutting on because the hotend temperature reading is erroneously >220°C at room temperature.
RE: Bad Thermistor in Hotend?
sorry I initially read the value as 22C not 22oc
220C suggests that the thermistor circuit is low resistance, worthwhile changing the thermistor,
220C is not low enough resistance for a shortcircuit.
If you unplug the thermistor, the display temperature should go below 15C and give you a mintemp error... if it doesn't, suspect a controller issue.
Good luck
Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK