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 (79)

  1. I keep getting E1 error message, the heater is fully submerged
    What is going on?
    I have had heater only 6 months
    Please assist.

    Walia
    May 28, 2024 Reply
    • Hi Walia,
      Sorry for the inconvenience caused to you.
      hygger customer service will reach you out to help solve the issue.
      Please keep an eye on the e-mail that from hygger team.

      Thanks
      hygger team

      May 29, 2024 Reply
  2. I have a 200w heater showing “L1” error code even if the heater is fully submerged in the water. Reset the heater couple times and still throwing error code.

    Al Agapay
    Apr 24, 2024 Reply
    • Hi Al Agapay,
      Sorry for the inconvenience caused to you.
      hygger customer service will reach you out to solve the issue.
      Please check the mailbox lately.

      Thanks

      Apr 24, 2024 Reply
  3. I have a 500 and a 800. Both are showing EE. Water temperature is well within range.

    Frank Burke
    Apr 13, 2024 Reply
    • Hi Frank Burke,
      Sorry for the inconvenience caused to you.
      hygger customer service will reach you out to solve the issue.
      Please check the mailbox lately.

      Thanks

      Apr 15, 2024 Reply
  4. I have 4 large aquariums with your heaters running for a year now or more. Two seem to have issues. One constantly turns on and off to hold temp. The other often runs to my high setting and alarming. Both probes have ben descaled/cleaned, repositioned, and the temp probe repositioned. I found oxidation on the prob plug terminals, which I cleaned, of the one that runs hot often. This did not help.
    Am I looking at replacing or are there fixes for these units?
    Thank you. Jim

    Jim Klingler
    Apr 7, 2024 Reply
    • Hi Jim Klingler,
      Sorry for the inconvenience caused to you.
      hygger customer service will reach you out to solve the issue.
      Please check the mailbox lately.

      Thanks

      Apr 8, 2024 Reply
  5. 1 month old 500W heater showing L1 error. Tried restting and re positioning multiple times. Any suggestions? Amazon purchased

    Scott La Bella
    Apr 6, 2024 Reply
    • Hi Scott La Bella,
      Sorry for the inconvenience caused to you.
      hygger customer service will reach you out to solve the issue.
      Please check the mailbox lately.

      Thanks

      Apr 7, 2024 Reply

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