Aquarium heater helps to maintain warm and stable water temperature, which is critically crucial for tanks, like tropical fish tanks. In our guide below, we will cover common troubleshooting of hygger aquarium heaters, along with how to repair the heater and how to set a heater’s temperature. After reading, you will know more about aquarium heater fixes.
Content Table
Common Troubleshooting of Aquarium Heaters
To begin with, we will list the common troubleshooting of aquarium heaters:
- Improper placement
- Excess temperature
- Too low temperature
- Temperature difference
- Over voltage fault
- Sensor fault
- Components fault
Besides that, sometimes you may be confused about the error codes. Consequently, next, we will share some specific examples.
1.001 Submersible Aquarium Heater
| Error code | Causes |
| E1 | The aquarium heater is exposed to the air |
| HH | The water temperature is above 95℉ |
| EE | The two sensors detect a 5° temperature difference |
| E4 | Over voltage fault |
| H1 H2 E2 E3 | The temperature sensor is short-circuited protection |
2.003 Variable Frequency Aquarium Heater
| Error code | Causes |
| LL | No.1 temperature sensor fault |
| HH | No.2 temperature sensor fault |
| E1 | The heater is out of water |
| E2 | The heater is placed somewhere with bad water recycle Components fault |
| E3 | The heater is placed somewhere with bad water recycle Components fault |
| E4 | Flat power grid interference |
3.007 Quartz Submersible Aquarium Heater
| Error code | Causes |
| E1 | The aquarium heater is exposed to the air |
| HH | The water temperature is above 95℉ |
| EE | The two sensors detect a 5° temperature difference |
| H4 | Over voltage fault |
| H1 H2 E2 E3 | The temperature sensor is short-circuited protection |
4.011 Smart Aquarium Heater
| Error code | Causes |
| Er & beeping | The heater is out of water/Sensor fault |
| Water temperature flashing & beeping | The water temperature is above 96.8℉ & poor water circulation or improper placement of the heater |
| Ec | Components fault |
| E3 | Relay fault |
| H1/H2 | Temperature sensor fault |
| White or yellow dirt adheres | Incrustation scale |
5.045 Tiny Titan Water Heater
| Error code | Causes |
| Er | The heater is out of water |
| EE flash | The temperature is above 95℉ |
| The heater turns red indication when it is out of water | Failure of the outwater shutoff function |
| The heater is working but can not reach the setup temperature | The ambient temperature is below 50℉ |
| H1 | Probe is broken |
| H2 | Probe is broken |
| E1 | Probe is broken |
| E2 | Probe is broken |
| E8 | Probe is broken |
| EL | Reminder after 10,000 hours of use |
6.060 Ultra Short Aquarium Quartz Heater
| Error code | Causes |
| LL | The temperature is lower than 59℉ (15℃) |
| HH | The temperature reaches 95℉ (35℃) |
| EE | Sensor fault |
| L1 | The heater is out of the water and exposed to air |
7.921 Aquarium Water Heater
| Error code | Causes |
| ER | The heater is exposed to air |
| EE | Water temp exceeds about 97°F |
| H1 | Temp sensor one is a short-circuited protection |
| H2 | Temp sensor two is short-circuited protection |
| E1 | Temp sensor one is open-circuit protection |
| E2 | Temp sensor two is open-circuit protection |
| E3 | The relay is melted |
8.969 hygger aquarium heater
| Error code | Causes |
| Er | The heater is exposed to air |
| EH | The water temperature is above 97℉ |
| Ec | Communication failure |
| E3 | The relay is melted |
| H1 | Temp sensor is short-circuited protection |
How to Repair an Aquarium Heater
In this segment, we will list remedies for some common heater faults.
| Faults | Solutions |
| The temperature is below the minimum level (too low temperature) | Increase the water/room temperature (e.g. add another aquarium heater/warm water for water changes/open heating fan/add an aquarium heating blanket) |
| The temperature reaches the maximum level (excess temperature) | Decrease the water/room temperature (e.g. open the air condition/open the cooling fan/add float ice packs in the water/avoid direct sunlight) |
| Sensor fault | Return the heater |
| The heater is exposed to air or out of the water (improper placement) | Fully submerge the heater in the water |
| 5° temperature difference detected by sensors | Discard the heater |
| Over voltage fault | Discard the heater |
| The temperature sensor is short-circuited or open-circuit protection | Discard the heater |
| Several degrees of differences between the water temp and the desired temp | Place the heater on the tank with great water circulation (e.g. the stream of a powerhead/the inlet or outlet of the aquarium filter/water pump) |
| Components fault | Check whether the water temp is over the maximum level or not. If it is above the maximum point, discard the heater. |
| Flat power grid interference | Restart |
| Relay fault | Re-plug in. If the heater can not be restored, then discard it. |
| Incrustation scale | Rinse the heater with clean water |
How to Set an Aquarium Heater’s Temperature
Additionally, how to set an aquarium heater’s temperature? Take a fully submersible heater as an example, you can set the desired temperature easily by pressing the “SET” button and choosing between 59 and 93℉. Provided that your set temp is 82℉, the heater will shut off automatically once the temp reaches the set point. Moreover, while heating, the light on the display will flash. It will stop flashing once it reaches the set temperature.
Reminder
If you want to get an aquarium heater, you should refer to the chart of the recommended tank and heater size, then you can choose the most suitable heater for your aquarium. Also, for safety during the cleaning process, you should unplug the heater first and leave it in the tank until it is cooled.
That’s all for today. For additional questions about hygger aquarium heaters, welcome to leave messages in the comment or contact us. We are happy to help you out. Finally, thanks for your time.
Related Products
Dear Hygger Customer Support Team,
I hope this message finds you well. I’m reaching out regarding an issue with my HG-921 aquarium heater, which I purchased on January 21, 2021. Recently, the device has been displaying an “EC” error code and emitting intermittent beeping. While unplugging it temporarily resolves the issue (allowing it to function briefly), the error recurs shortly afterward.
Though the heater currently maintains the tank temperature, I’m concerned it may fail completely, potentially endangering my fish. I’d greatly appreciate any troubleshooting advice or warranty support you can provide. Below are additional details for your reference:
– **Model:** HG-921
– **Purchase Date:** January 21, 2021
– **Symptoms:** EC error code, beeping, intermittent operation.
Thank you for your time and assistance. Please let me know if you need further information. I look forward to your guidance.
Best regards,
BT Gilliland
Hi B.T. Gilliland,
hygger customer service will reach out to you and help to solve the issue you are having.
Thank you for your patience and support.
Thanks
hygger team
i have a 300w, only had it for 1 month. it is beeping and says LL. it is fully submerged, floating thermometer say water is at temp. Do you need to send me a replacement?
Hi bobby tucker,
Sorry for the inconvenience caused to you.
Please clean the heater and keep it fully submerged in the water.
If it doesn’t work, hygger customer service will get in touch with you soon.
Thanks
hygger team
Bought the 500 watt double quartz heater less than a year ago and it started beeping and flashing auto shut off and it was always submersed too it out cleaned it still doing the same thing
Hi Nestor carballo,
hygger customer service will reach out to you and help to solve the issue you are having.
Thank you for your patience and support.
Thanks
hygger team
My hygger heater is flashing HI, what does this mean?
Hi Greg Parker,
hygger customer service will reach out to you and help to solve the issue you are having.
Thank you for your patience and support.
Thanks
hygger team
My 25w small submersible heater is flashing between 73 and whatever temp I have it set at. It was set at 80 and it flashed between 73 and 80. I changed the temp to 78 and its flashing between 73 and 78. The tank temp on my separate thermometer is reading OK. Its a 3gal
Hi Sara,
hygger customer service will reach out to you and help to solve the issue you are having.
Thank you for your patience and support.
Thanks
hygger team