The printer displays the message "Temp not matching - Measured temperature is not matching expected value. Check the thermistor is in contact with heatbed. In case of damage, replace it." when the measured temperature is different from the temperature expected temperature for the heatbed.
This can happen if any thermistor failure on the heatbed causes the printer to read the temperature within a few degrees from the target temperature, but not the target temperature itself. The heater will keep trying to heat up while the target temperature is not reached. To prevent overheating the printer generates the error.
The error might indicate some issue with the wiring, either the heater or the thermistor cables are possibly damaged.
Check if the room where the printer is does not have a temperature below 15 ºC.
Check the heatbed, where the thermistor and heater reside, that no wires have broken off the sensor or heater themselves. While the printer is turned off, carefully try to move the wires by hand. If any of them have come detached your search is over and the part needs to be changed. It is not recommended to solder these wires, moreover, for the thermistor, it will change its resistance and thus readings. Spare parts can be found in our e-shop, or you can contact Support for assistance.
Try preheating the heatbed in LCD-menu -> Settings -> Temperatures -> Heatbed to 90 ºC. After the temperature is reached, move the cables behind the heatbed by hand to see if the error will appear. In case the LCD main screen shows 0/0 in the heatbed temperature, check the cable connections to the Buddy board.
Loosen the one screw securing the cover (circled in the picture below), remove the top cable cover and flip it open to reveal the board.
Check that all the connectors are secure in their sockets, according to the picture below. Focus on the thermistor and heater cables (yellow arrows). Though unlikely, rough shipping or handling could have shaken the heater or thermistor cables loose.
The table below describes the correct resistance for each part, as well as what scale you should set your meter to. We have another more in-depth guide on Multimeter usage. All thermistors are rated to be 100 kΩ at 25 °C. To be realistic, with a varying temperature between 20 °C and 30 °C, you can expect a wider range of readings (~85-125 kΩ) than with the heater.
Thermistors (Bed and hotend)
[80 kΩ - 125 kΩ]
[6.5 Ω - 7 Ω ]
For every component, there are several options, our main focus will be on the connectors. The measurement appears on the multimeter LCD as soon as the measurement probes touch the component. To obtain the correct and relevant values, this is where you need to apply the probes:
The hot end and heat bed have the same connector. Make sure you measure the correct one.
In case you find some parts are faulty, please order them using our e-shop, then follow the service guide(s):