Submersible aquarium heater remains off, even when I do not disconnect?

I have had this problem twice in my 10 gallon tank heater, and now had only been going on in my 55 liter water heater – any ideas? They are at the temperatures they want less, and are connected to the workstations. They were working (I could see the light was on), but this morning I realized that the water was very cold in the girl 55. tank. Lights go on the heater! And I can not seem to get it back – I tried unplugging and plugging it back, try a different take, even tried to shake him. The girl 10. tank heater, which would return when he shook, and I had no problems with it for a while.

Change or replace the heater, its not working properly, which is dangerous because it is an electrical appliance.

Aquarium controller

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