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Home › Sea Life › Fish Keeping Hobby › Aquariums › Aqueon › Heater Stopped Working

Troubleshooting Aqueon Water Heater Function

By and large, most fishkeeping hobbyists use an all-in-one submersible aquarium heater to achieve, and maintain, the best climate for pet fishes to live and grow.

This help guide explains how to set up a fish tank heater and then adjust the settings to create the ideal amount of warmth for various fish families and different tank sizes.

Top Tips for Setting the Heater Temperature

Before you start fishkeeping for a hobby, there are several factors that you should consider, especially:

• What size of fish tank will meet your goals and budget.
• What kind of fish species and plants will you be keeping inside the aquarium?
• What water temperature will best suit your chosen pet fishes.

So, unless you buy one of the Aqueon® fish tank kits, you may need to buy the accessories as separate items (including a water heater).

Either way, you'll need a comfortable environment with a stable water temperature. This will be paramount for the health of your fish and any live plants that you put inside the tank.

In fact, maintaining the optimum aquarium temperature is also important for efficient oxygenation. If the water is too cold or too hot, it can cause the premature death of beneficial bacteria. It can also cause a chemical imbalance which often results in poor metabolism for most tropical fish species.

Installing a Submersible Aquarium Heater

There will be a thermostat to help you control the temperature of the water. So, before you plug it in, check that it has the correct setting for your particular requirements.

After you have set the temperature on the Aqueon aquarium heater, affix it to the side wall of the tank (e.g. using a suction cup) and insert the plug into a power outlet.

Make sure the tank has enough water to surround the heater. Plus, check that the electrical cord is not tangled and it's not dangling in any other water sources nearby.

This part is important:

You should see a red indicator light on the front of a submersible aquarium heater. This means the heating element contained inside the unit is working. In other words, it has started to heat up the water inside the aquarium.

It is best to monitor the heater for up to an hour as it warms up the water inside the tank. Soon, the indicator light should change from red to green after it reaches the desired water temperature (e.g. as shown on the thermostat dial).

Using Aqueon® Preset Submersible Heaters

It's important to use a water heater with enough electrical power to cope with the size of aquarium that you have. Fish tank heaters made by All Glass Aquarium Co. Inc. are available in several different sizes, including:

• 50 watts (for small glass and plastic aquariums up to ten gallons)
• 100 watts (for larger aquariums with 10 to 20 gallon capacity)
• 150 watts (for larger aquariums with 20 to 30 gallon capacity)

In general, the best place to put an aquarium heater is upright on the side of the tank and close to the air pump and filter.

This placement encourages water to circulate with an even heat distribution around the container as it generates warmth for the fish.

Pro Tip: Another help guide explains how to troubleshoot Aqueon filter problems with expert tips for finding easy solutions.

How to Adjust the Heater Temperature

Most fish species kept as pets in captivity will be healthy when the water is stable at 22-26° Celsius (around 75° Fahrenheit). So, you may only need to install a preset aquarium heater in the correct position, turn it on, and test it for proper function.

Even so, because Aqueon heater units are user-friendly, you will be able to fine-tune the temperature of the water according to your needs.

But, what if you find the heater is not providing enough heat or it feels cool to the touch? In this case, there are ways to adjust the thermostat setting to increase the heating power (or reduce it).

You should be able to rotate the button or knob if yours is an adjustable heater. But, you may need to replace the entire unit for one that is set to the desired temperature if you have a non-adjustable version.

Best water temperature range for popular fish species:

• Cichlids(78-82° F)
• Goldfish (68-74° F)
• Guppies (74-82° F)
• Mollies (75-80° F)
• Neon Tetras (70-81° F)
• Platies (68-82° F)
• Siamese fighting fish (78-80° F)
• Swordtails (72-79° F)
• Tetras (75-80° F)

Pro Top: Often, the water temperature in aquariums will fluctuate through the day and at night-time. This is one reason why aquarists use a thermometer to check the water temperature at regular intervals.

How to Use a Fish Tank Thermometer

You can use a thermometer to measure the temperature of the water inside the tank. In simple terms, this simple device helps you monitor and regulate the heat inside your aquarium.

The Top Fin® digital aquarium thermometer has an LCD screen that displays in Celsius or Fahrenheit and it comes with a replaceable battery.

Keep in mind that it's best to place it at the opposite end to the heater position so you get accurate temperature readings.

How to Check if the Aqueon Heater is Working?

After following the manufacturer's instructions for water heater setup and adjustment, what can you do if it doesn't turn on?

Here are some basic steps to take when troubleshooting Aqueon heater problems:

• Check the electrical power cord is correctly plugged into an outlet and the outlet is safe and in good working order.
• If the thermostat has not been set to a high enough temperature, adjusting it to a higher setting may solve the problem.
• Make sure you have turned on the heater. If so, you may need to clean (or replace) the heating element. A build up of minerals can make it dirty and lead to insufficient heat issues. You can clean a grubby heating element by removing it from the tank and using a stiff brush (e.g. toothbrush) to scrub it.

If the appliance has been installed for twenty four (24) hours or longer, and the temperature of the water is still much lower than the required temperature, proceed as follows:

• Be sure to use a quality, accurate thermometer to monitor water temperature.
• Make sure that the appliance is plugged in and is receiving power.
• Make sure that the appliance is submerged at least to the minimum water level line.
• Make sure the water circulation around the appliance is adequate.
• Make sure that the heater wattage is adequate for the gallon size of the aquarium.
• Make sure that the glass is not covered with lime scale. If necessary, remove lime scale after the appliance has been unplugged.

If the temperature is too high, after the appliance has been working for twenty four (24) hours or longer, proceed as follows:

• Be sure to use a quality, accurate thermometer to monitor water temperature.
• Make sure that the heater wattage is adequate for the gallon size of the aquarium.
• Check whether too much water has evaporated, consequently reducing the volume to such an extent that it no longer falls within the range given on the label. If this is the case, add water immediately.

Additional Tips

• For larger tanks, you may want to use two smaller heaters instead of one large one. This provides more even heating and redundancy in case one heater fails.
• Ensure your chosen heater is able to maintain a stable temperature in the type of environment that you've set up inside your aquarium.

Pro Tip: The type of fish that you are keeping will determine the ideal water temperature inside the tank. Even so, heating the water above 30° Celsius (86° Fahrenheit) for a long period of time may harm the fish.

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