Hygger Aquarium Heater Troubleshooting Fix

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
  • 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 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 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 restore, 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

Aquarium Double Quartz Heater
Frequency heater saving energy and easy to clean

hygger Aquarium Double Quartz Heater

$25.99$60.99
Hygger Fully Submersible Aquarium Heater 500W/800W
Submersible Heater Temperature Controller

hygger Fully Submersible 500W Aquarium Heater

$37.99$65.99

Comments (29)

  1. I appreciate your clear explanations and the emphasis on safety throughout the process.
    It’s evident that you care about your readers’ well-being and want us to tackle these issues safely and effectively.
    Your blog has become my go-to resource for appliance-related issues,
    and I’ll be sure to share it with friends and family who might face similar problems with their appliances.
    Keep up the fantastic work!

    Sohel'Rana
    Nov 24, 2023 Reply
  2. I’m on my second hg061 500 w heater. They are both doing the same thing. When I go to set my temp if I am under the actual temp of the water the heater light is lit blue. Soon as I go over the water temp the blue light turns off and the keep light turns red. It doesn’t seem like it is heating. It’s a 75 gallon tank.

    Randy
    Oct 23, 2023 Reply
    • Hi Randy,
      Sorry for the inconvenience caused to you.
      Please mail your order No. to [email protected], and a video of the issue is appreciately.
      hygger exclusive customer service is waiting for helping you solve the problem.

      Thanks
      hygger team

      Oct 24, 2023 Reply
    • The light turns red when it is heating, so it seems to be working fine. Give it some time, you’ll see the water temp rise. Shut the pumps off and you’ll be able to see the water ripple around the heater and above it.

      Todd
      Nov 10, 2023 Reply
  3. My hugger 500w is a month old and showing a er code. It is fully submerged 3 inches under the water and is currently not heating my tank.

    Seth Heilig
    Oct 10, 2023 Reply
    • Hi, Seth Heilig. It may be the result of sensor fault. Plase give us more detailed information, like the model of your heater. You can mail order No. and a video about the issue to [email protected]. hygger exclusive customer service is ready to help you out.

      Thanks,
      hygger team

      Ice
      Oct 10, 2023 Reply
  4. Temperature shows 30° and I cannot reduce it. What is wrong with the unit?

    philip brindley
    Sep 9, 2023 Reply
    • Hello, Philip Brindley. Please mail your order No. and a video about the issue to [email protected]. hygger exclusive customer service is ready to help you out.

      Thanks,
      hygger team

      Ice
      Sep 11, 2023 Reply
  5. Have a 9 month old 800w double quartz heater that is showing HH in water under 80 degrees. I think I just need to replace it. Is there anything I can do?

    Xavier
    Sep 8, 2023 Reply
    • Hi, Xavier. Please mail your order No. and a video about the issue to [email protected]. hygger exclusive customer service is ready to help you out.

      Thanks,
      hygger team

      Ice
      Sep 8, 2023 Reply

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