If your coffee machine isn't heating up, it could be due to a number of factors. First, check to see if the machine is plugged in and turned on. If it is, then the problem may be with the heating element itself. This can usually be checked by opening up the machine and inspecting the element for signs of damage. If it looks damaged, it will need to be replaced. Another possibility is that there is something blocking the flow of electricity to the heating element. This could be caused by a faulty wire or connection. Again, this can usually be checked by opening up the machine and inspecting the wiring. If you see any damage, it will need to be repaired or replaced. Finally, it's possible that the problem lies with the machine's thermostat. This component regulates the temperature of the water and if it isn't working properly, the coffee machine may not heat up correctly. If you suspect this is the case, you'll need to take the machine to a qualified technician for repairs.