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Fluval 406 Noise Issue

Postby Cichfish » Fri Jul 06, 2012 9:51 pm

Hello everyone I have a Fluval 406 Canister Filter when I first got the unit it worked excellent with no issues. Today I did maintenance on the unit cleaned out the filter pads, the micro filter pads, removed the part that covers the impeller washed it out, removed the impeller and washed it out. I put everything back together and purged the unit before plugging it in. I then plugged the unit in and set the flow to max and after an hour passes by it makes a loud awful sound. It sounds like the impeller causing a lot of noise I rocked the motor back and forth and you can hear the bubbles escaping the noise goes away but then it comes back half hour later. I don't know what to do and I spent $$$ on this unit after reading good reviews about them. The only time when the noise goes away is when I adjust the flow meter to about 50% but I', not getting the full GPH from the Canister. Any help would be appreciated thanks. :-?
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Re: Fluval 406 Noise Issue

Postby fusion » Fri Jul 06, 2012 10:08 pm

Id Take it apart again just to be sure you put everything back correctly
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Re: Fluval 406 Noise Issue

Postby Cichfish » Fri Jul 06, 2012 10:16 pm

I did that a few times with the same results. The noise doesn't go away.
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Re: Fluval 406 Noise Issue

Postby vann59 » Fri Jul 06, 2012 10:20 pm

Have you tried unplugging it, and using the purge pump again to remove any trapped air?
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Re: Fluval 406 Noise Issue

Postby Cichfish » Fri Jul 06, 2012 10:24 pm

Yes I also did that without any luck...
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Re: Fluval 406 Noise Issue

Postby 13razorbackfan » Fri Jul 06, 2012 11:29 pm

I would lube the impeller shaft. I almost never clean my impellers unless they are really gunked up. When I do I make sure to lube the shaft and magnet with vaseline or silicone grease. I would try that and I bet it helps.

PS....how is the flow? Just noisy?
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Re: Fluval 406 Noise Issue

Postby Cichfish » Fri Jul 06, 2012 11:56 pm

ok I will give that a shot and see what happens...the flow rate is fine just that I have to keep it on 50% if I try to increase the flow rate the noise will start happening again....is this a common issue with these Fluval Canisters?
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Re: Fluval 406 Noise Issue

Postby 13razorbackfan » Fri Jul 06, 2012 11:58 pm

Cichfish wrote:ok I will give that a shot and see what happens...the flow rate is fine just that I have to keep it on 50% if I try to increase the flow rate the noise will start happening again....is this a common issue with these Fluval Canisters?

It can be common with any filter where there is a problem with the impeller not just fluval. Assuming it is the impeller. Did you let the canister prime before turning it on? Was it full of water?
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Re: Fluval 406 Noise Issue

Postby Cichfish » Sat Jul 07, 2012 12:10 am

before I plugged the unit back on, I got some of the air out by purging the system with that special handle on top then I plugged the unit back in. The canister was full of water when doing this...should I not leave it filled with water all the way after doing maintenance...
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Re: Fluval 406 Noise Issue

Postby 13razorbackfan » Sat Jul 07, 2012 12:14 am

Cichfish wrote:before I plugged the unit back on, I got some of the air out by purging the system with that special handle on top then I plugged the unit back in. The canister was full of water when doing this...should I not leave it filled with water all the way after doing maintenance...

That sounds ok. I would try and lube up the impeller shaft and magnet and see what happens. You may have to order a new impeller if it is damaged.
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Re: Fluval 406 Noise Issue

Postby NeptunesNeighborhood » Sat Jul 07, 2012 3:32 am

Cichfish wrote:before I plugged the unit back on, I got some of the air out by purging the system with that special handle on top then I plugged the unit back in. The canister was full of water when doing this...should I not leave it filled with water all the way after doing maintenance...


The directions say to empty it out while doing maintenance and then let it prime before plugging it back in. I've done maintenance and left it half full and didn't have an issue though
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Re: Fluval 406 Noise Issue

Postby Cichfish » Sat Jul 07, 2012 9:46 am

I will try the vaseline around the impeller and see if that solves the issue. The impeller looks good I didn't see any cracks or any abnormalities.
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Re: Fluval 406 Noise Issue

Postby m1ke715m » Sat Jul 07, 2012 11:02 am

i had the same thing happen with my 405 the other day.. you have to make sure the impeller cover is actually snapped all the way down.. sometimes it looks like its snapped all the way down and isnt... also be careful not to break the clips on it.. I've broken quite a few of them.. anyways the cover being not all the way down made mine make some noise till i fixed it

also check the white impeller shaft and rubber grommet thats on the end of it to make sure they arent broken I've also had that happen and it will make it move around and make noise
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Re: Fluval 406 Noise Issue

Postby blackedout » Sat Jul 07, 2012 12:48 pm

i have 2 fluval 406's on my 75, and today, did my routine maintenance, and i'm having the same problem with one of mine, i have taken it apart and retired 5 times now, and I'm getting frustrated.....
75 Gallon, 2x Fluval 406's, Peacock / Hap Tank
55 Gallon, Fluval 305, peacock fry / pregnant females
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Re: Fluval 406 Noise Issue

Postby Cichfish » Sat Jul 07, 2012 1:04 pm

So I went ahead and added some Vaseline around the impeller and the magnetic shaft basically I added Vaseline to all the moving parts I could see and still I'm getting loud noises coming from the filter when the flow adjustment is set to max flow. When I reduce the flow the noise goes away so currently I have the flow set to about 50% and everything is fine. Not sure what this issue is and I might have to contact Fluval. This unit was bought online at fosters and smith and is only a few months old I got the unit when it first came out. Not sure what else to do???...its getting frustrating...
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