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.
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 | There is a 5° temperature difference detected by the two sensors |
| 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 |
|
| E3 |
|
| 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 | There is a 5° temperature difference detected by the two sensors |
| 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 out water 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 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 you can choose 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. And it will stop flashing once it reaches the set temp.
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
Hi,
I have had the hygger Aquarium Heater, 500W Variable Frequency Submersible Fish Tank Heater for around 5 months, however this is now reporting an EC error and beeping. Can you let me know what can be done? The heater was purchased through Amazon.
Hi John,
We need more details about the issue to make a more accurate answer for you.
Please mail your order No. and shoot a video about the issue then send them to [email protected]
The exclusive customer service is ready to help you out.
Thanks,
Hygger Team
Hello,
I do not appear to have received an email, unless it has been deleted by mistake!
Could you please send me another email just in case, many thanks.
Hi David Pooke, please check your email again.
The reply from hygger was sent.
Thanks
hygger team
Hello,
I purchased a Hugger 500W Aquarium Heater, Submersible Fish Tank Water Heater with External Cooler LED Digital Temperature Controller, Fast Heating for 60~180 Gallon for Freshwater on the 28th January 2023 for £51.99 through Amazon Order # 206-0779752-4367559.
Unfortunately it appears to now be faulty, it is showing EC with an audible alarm.
Could you please let me know what can be done.
Hi David Pooke,
Sorry for the inconvenience caused to you.
The hygger exclusive customer service has mailed to you to help solve the issue, please check your e-mail.
Thanks
hygger team
I believe my heater is now displaying in Celsius rather than Fahrenheit. I’ve had the heater for just over a month. It always displayed at 82’ and now today I noticed it was displaying 27’. I cut it off for about 20 minutes but it’s still showing the same. It’s a Hygger 500 watt heater. Is that normal?
Hi, raul castro. You can try to press the controller to choose ℉ or ℃. For more detailed solutions, we need to know the model of your heater actually. Or you can contact us via [email protected]
hygger exclusive customer service will help you out.
Thanks,
hygger team
Beeping from water heater units is seen as a red flag for trouble. A leak in the system, a broken thermostat or sensor, a broken temperature and pressure relief valve, or obstructions inside the unit are all possible causes of the issue.