A hang-on filter is essential for keeping your aquarium water clean and healthy. Occasionally, you may encounter issues such as the filter stopping, making unusual noises, struggling to prime, or producing an air-like sound. Follow these troubleshooting steps to resolve the most common problems before contacting our support team.
Safety First
Always disconnect the mains electricity supply before inspecting or handling your filter. Read your product’s instruction manual, including the troubleshooting section, for guidance specific to your model.
If Your Filter Has Stopped Working
Inspect the Impeller and Shaft – Open the unit and check for blockages, damage, or dislodgement. Remove the motor head to confirm these parts are intact and properly seated. Ensure the plastic propeller is securely attached to the magnetic body and not split.
Check the Filter Media – Look for clogs or imperfections in the media, as these can restrict water flow and impact performance.
Check Rubber Grommets – Verify that two grommets are fitted, one on each end of the shaft or within the fittings.
Reassemble Carefully – After all inspections, reassemble the unit carefully to avoid leaks or misalignment.
Test the Power Supply – Try the filter in a different plug socket, as faulty outlets or blown fuses are common culprits.
If Your Filter Is Making Noise
Noise usually stems from priming issues or impeller problems:
Priming Issues – Fill the filter with water from your aquarium before switching it on. Topping up your tank water may also help ensure smooth water flow.
Impeller Problems – If noise persists, remove the impeller and check it isn’t damaged or loose. The propeller fan must remain securely connected to the magnet body.
If Your Filter Won’t Prime
Most priming issues are solved by filling the filter with water before powering on. You may also need to top up your aquarium to establish a proper siphon. For step-by-step help, watch our YouTube guide on the hang-on filter range.
My Filter Makes an Air-Like Sound – Is This Normal?
Yes, during priming it’s normal for a hang-on filter to produce an air-like sound. This typically stops once the filter is fully filled and water flows smoothly. If the sound continues, refill the filter manually and ensure your tank water level is adequate.
Still Need Help?
If problems persist, gather your order number, check whether your filter is still under warranty, and contact our customer services team. If there’s visible damage, send photos so we can assist quickly.