My aquarium heater has stopped working.

It is important to make sure you are running this device fully submerged in the water, and that you are able to see the heat coils turning red inside the glass tube. Please inspect the glass tube for any hairline cracks or damage and ensure the top is sealed completely and the cable connection looks okay.
The light should appear with a clicking noise when the heater is heating and then again once the tank has reached its desired temperature - the light may then switch off. When the temperature drops again, the same thing will occur

If you come across any damage, please send an image to our customer services team who will be able to assist you further.