What To Do When Your Canister Filter Stops Working
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Presuming you’ve already checked all hose connections and made no other changes such as changing the filter’s position, first thing to do is check the impeller compartment if something is stuck in there. If nothing, then try to take the impeller out and clean it again. Double check and make sure the impeller can turn okay. It can also be caused by too much air trapped in the filter so empty out any water and try again.
You may also try these steps: Start by turning on both taps, then pull down the handle to start priming. Slowly push the handle up at once when water starts to rush in. Lastly, turn the power on as soon as the handle fully locks up. If the filter is working, it should be flawless and very quiet.
Last resort is to remove everything – the hoses, the impeller, everything. Run a hose from the tap and blast out the internal areas of the filter body where water flows. You will be surprised at the gunk that flies out.
Replacement Parts For External Aquarium Filter:

