1. Turn off power: First and foremost, make sure to turn off the power supply to your heating element. This will ensure your safety.

2. Disassemble: Disassemble the heating element carefully by following the manufacturer's instructions. Usually, there will be a cover or a protection plate that needs to be removed first.

3. Inspect: Use a multimeter to inspect the heating element for any signs of wear and tear or damage. If the element is visibly damaged, then it will need to be replaced.

4. Clean: Clean the exposed area where the heating element is located. Careful cleaning will also help reveal any issues with the element.

5. Replace: If the heating element is damaged or has failed, replace it with a new one following the manufacturer's instructions. Make sure you are using a suitable replacement element for your specific cartridge.

6. Reassemble: Once the new heating element is securely installed, reassemble the cartridge according to the manufacturer's instructions.

7. Test run: Finally, turn on the power supply and run a test to ensure that the new heating element is functioning properly.