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.
Hi there. My heater is flashing L1 but is in the water. How can i reset it. I already unplugged it and left it out of water for 30 minutes and its still not working
Hi David Gerli,
Sorry for the inconvenience caused to you.
hygger customer service will reach you out to solve the issue.
Please check the mailbox lately.
Thanks
hygger team
Hi my Hygger double quartz heater 500W is just beeping non stop when I plug it in. It’s never done that before. I’ve unplugged, left off for a few days and it continues to do the same beeping when I plug it back in. I dont see any errors on the screen. Amy idea of whats going on? It’s maybe a year old. It’s a 75 gallon fish tank
Hi Vickie Corbin,
Sorry for the inconvenience caused to you.
hygger customer service will reach you out to solve the issue.
Please check the mailbox lately.
Thanks
hygger team
Hi I bought a HG019 a couple of months back. It’s been great until now.
I’ve got E3 and both lights flashing and my tank is getting cold. Really annoyed as I spent extra getting a decent heater.
Hi Ruth Chisholm,
Sorry for the inconvenience caused to you.
hygger customer service will reach you out to solve the issue.
Please check the mailbox lately.
Thanks
hygger team
My hygger heater does not get power anymore.
It is only 4months old
The display is black with no power.
Hi Benjamin Girard,
Sorry for the inconvenience caused to you.
hygger customer service will reach you out to solve the issue.
Please check the mailbox lately.
Thanks
hygger team
I have a hygger double quartz heater HG043 500w for my 75 gal tank that I purchased from my local fish store. I set up my tank yesterday and set the thermostat to 74 and it heated to 87 and will not go down. I have unplugged it for an hour and replugged it in and it is still very hot. There is no beeping or blinking. It just shows the temp and what it’s supposed to be with 0w for power given like everything is normal (which it’s not) Thankfully I don’t have any fish in there or they’d be dead. Can you help?
Hi Alexis,
Sorry for the inconvenience caused to you.
hygger customer service will reach you out to solve the issue.
Please check the mailbox lately.
Thanks
hygger team