CHC Pro Volcano Hotend

Replace Temp Sensor On CHC Pro Volcano Hotend

Safety Cautions:
Make sure you have ordered and received the correct voltage heater and fan to match the power supply of your printer.

The standard CHC Ceramic heating element maximum temperature can reach 320°C. Exceeding 320 degrees Celsius may cause irreparable damage to the ceramic heating element. CHC and CHC-PRO heating cores are equipped with two types of temperature sensor, 104 nt-4-r025h42g and RTD PT1000 class-B. The working temperature of 104nt-4 should not exceed 290 degrees Celsius.
If you are replacing the stock heating block on a commercial printer, and your original thermistor is not PT1000 or 104NT-4-r025h42g. The firmware modification is not optional. It is a mandatory step.

Connecting 12v parts to a 24v power supply can result in overheating, component damage, or fire. If you are unsure double-check the rating on your power supply.
Your hot-end and your printer are your responsibility. We cannot be held responsible for damages caused by the use, misuse or abuse of our products.
Warning: Fragile! Please do not clamp or bump the white ceramic heating element with tools under any circumstances.

Temperature Sensor Replacement

If you want to change the type of temperature sensor or repair the damaged one. Follow the steps below.

1. Please prepare a 1.5MM Allen key, Acetate Cloth Electrical Tape or Kapton Tape.( Can withstand at least 150 degrees Celsius) New Compatible Temperature Sensor. High temperature nylon zip ties (included with kit). There are currently three compatible temperature sensors, NTC100KB3950, 104NT-4 and PT1000. Among them, the PT1000 cannot use the protective spring due to the use of a glass fiber braided sleeve with a heat resistance of 450 degrees, and the other two have a spring sleeve for protection.

2. Cut the nylon zip tie from the harness support plate carefully.


3. Use a 1.5mm Allen key to remove the screws of the harness support plate, If the screw fixing place has been contaminated with melted plastic residue, it may be necessary to heat it over 150°C to unscrew the screw. Please note that if you feel that the tool is not suitable, please do not force it. Please note that the harness support plate and screw may be slightly different due to the production batch.

4. Use a blade or small scissors to gently break open the off-white silicone heat-shrink tubing wrapped around the wiring harness, being very careful not to damage the wires inside.

5. Carefully separate the leads of the temperature sensor and the ceramic heating element, and carefully remove the temperature sensor from the heating core. If your temperature sensor has a spring sleeve, you can easily pull out the entire thermistor by turning the spring sleeve counterclockwise with your finger.

6. Take out the new temperature sensor, for TP1000 insert the sensor head and the glass fiber braided sleeve on the sensor lead into the hole for the sensor, making sure to insert it’s head all the way in. Be careful not to leak the sensor lead and touch it to the hole wall to cause a short circuit. If your temperature sensor has a spring sleeve, keep the thermistor head just outside the sleeve, as shown in the picture below. Simply turn the spring sleeve counterclockwise with your finger to easily insert the entire thermistor.


7. Wrap the temperature sensing leads and ceramic heating element leads with Acetate Cloth Electrical Tape or Kapton Tape. Keep the tape a distance of 3-5mm from the heating core.

8. Reinstall the support plate as it is, taking care to keep the hex key upright and not to damage the screw heads.

9. Re-tie a new nylon heat-resistant zip tie where the tie was originally tied. Then test the new temperature sensor to see if it works. If you have a multimeter, measure the two leads of the temperature sensor and the metal part of the heating core short circuit, if there is no short, you are done.