troubleshooting heater component for benchtop bioreactor

troubleshoot thermal heater module for benchtop bioreactor: it stopped working the thermal heater is a module that warms up the water that surrounds a glass 2 Lt container, the whole device is benchtop laboratory equipment. The electronics are housed in a benchtop electronic cabinet connected to the thermal heater, it might be the fuse, the heater itself, or the cable. I need experienced hands, with experience working on electronic appliances who can do this job.