Aquarium Heater,Fish Tank Heater,300 Watt Submersible Water Heater For Aquarium 25-50 Gallon,Betta Fish Heater Auto Thermostat

IMPORTANT: 1The aquarium heater must be used with the water pump.It is necessary to ensure the water circulation when using.If the water doesnt flow the temperature will rise sharply leading to temperature out of control. the heater should be used in the area with good water flow Tips:Air stone and sponge filter cannot replace water pump 2Avoid using the fish tank heater in a narrow space 3If the heater start protection code (e.g. EE E1) cut off the power supply take out the heater and put it into the fish tank again. After 5 minutes plug it in again the heater can restart itself and return to normal use FAULT CODE DESCRIPTION: E1 means that the fish tank heater starts water shortage and power-off protection. Please check whether the heater is completely immersed in water clean the dirt on the sensor and the heater will automatically enter the normal state after re plugging in EE means that the heater starts 96 overtemperature protection or abnormal water temperature change warning. Please check whether the water temperature is normal. When the water temperature is below 93 ° F and the water temperature remains normal for 3 minutes the heater will automatically enter the normal working state after re plugging in