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Any water coming out when you on the canister? If there is, is it reduced flow?
Does the sound lessen after a while? Maybe after the 5min?
hi all,
my eheim pro2 canister makes loud knocking sound when turn on
when i take out and examine the impeller, there isn't any visible damage/crack etc
how do i know whether to replace the entire impeller, or just the white "skewer" and the 2 rubber "stoppers"?
Any water coming out when you on the canister? If there is, is it reduced flow?
Does the sound lessen after a while? Maybe after the 5min?
I am balding but i am still young!
no, no water, the canister cannot function now...
the impeller will still spin and make noise when it is switched on (without water)
when i take out the impeller, the bottom rubber got deteched from the skewer and stuck to the filter...i have to dig it out
Originally Posted by gentle
If the impeller still spins, then its an indication that it might be working fine.
I am not sure if you know, you need to fill the canister with water before you start it. which means the inlet pipes, outlet pipes and the entire canister needs to be filled with water. the action they term as priming.
If you have primed the filter before ignore the below text and perhaps show some pictures/video of the problem?
Place the impeller back, put in the "skewer". one end of the skewer should be in the motor head (if you take a torch light and shine it into the hole that the impeller sits, you will see an indentation meant for the skewer to be poked through). the other end of the skewer should have a rubber cap.
there should be a priming button (gray one) that does this.. pump the gray button a few times with the inlet and outlet pipe in position. you should see water start flowing from the inlet to the canister to the outlet. this is done with the filter switched off.
Once the water fills up the filter, turn the filter on. there would be some loud noises.. but should go away in a few minutes.
I am balding but i am still young!
thanks - yes i know what is priming... LOL
so you think it is a priming issue rather than faulty impeller (since it is still spinning)
i will check when i get home
No offense lah.
I would be inclined to think there are trapped air in the motor. but that normally goes away after a while.
There was once i connected the inlet to the outlet of the canister.. causing air to be sucked into the motor... i was face palming the entire evening.
I am balding but i am still young!
no problem, i am cool
both side of the "skewer" should have a rubber cap, no?
Low tech tank FTW!
yes correct...although it is loose and can get detached from the skewer easily if you take the impeller out (but i think this should not be a problem because if it is assembled properly, there is a "cover" that keep both ends in place)
is it normal that if i switch on the pump without any water in the canister, it will make loud knocking sound?
yes it is normal, it will sound like the canister is going to explode, please do not switch on any water pump dry, it will damage the pump.
Low tech tank FTW!
It is probably trap air in the canister. Did you put your air pump or co2 outlet near the inlet pipe?
I am a Eheim user.
Eheim uses A/C induction to spin the impeller. The knocking sound is from the impeller magnet body hitting against the motor housing which contains a metal solenoid. DO NOT start without water. It will damage the impeller / housing and will cost $200+ damage. Only the housing is warranted. The "skewer" is actually a ceramic stick which helps to centre the impeller against the magnet attraction to the housing. It also lessen friction and longevity of the impeller. The skewer alone cost $30. So it will be costly if abused. Operating with water, the knocking should be audible for first few seconds as the impeller spins up. This is normal. What is abnormal is the knocking continues without stopping.
looks like my problem is the more expensive one...
i primed the filter fully and when i switched on, can only hear the noise and water doesn't flow...
https://drive.google.com/file/d/0B-e...it?usp=sharing
this filter (used in office tank) has gone through a weekend of running without priming due to air being sucked in...this happens a few other times over the past few years, but this time it seems like the damage is permanent...
My guess is,you probably screw up the impeller when you run the filter without priming through the weekend.
Pro 2 impeller will cost you around Sgd 50 more or less.
Baton courtesy.....service with a smile!
It really sound like that impeller is not touching any water at all. I do not know how primed was your filter but that was the worst sound I have ever heard. Where did the water go to to reach that terrible state? Since you recorded the noise, could you record the whole water hose from inlet to outlet?
Even if air is being suck in, the hose should have some water left, no way it would be left empty. Another question, did you add extra media in the media tray? I did that once and the water flow rate dropped drastically till it stop, lucky I caught it on time. Also, the canister filter is below the tank right?
If you've learnt, teach, if you have, give.
Don't walk behind me as I might not lead, don't walk in front of me as I might not follow. Walk beside me, as my friend.
Mohamad Rohaizal is my name. If it's too hard, use BFG. I don't mind.
i am sure it is fully primed because i used a garden hose to push water in from the inlet tube until no more air comes out from the outlet tube... the water level of the tank is above the canister
and if i bring the outlet tube to ground level (without powering up the canister), water gets siphon out through the inlet
when i put the outlet back to the tank and power up, there is no water movement
for the setup in the video, there was no media/tray inside the canister - but that shouldn't be the cause of the problem right?
Baton courtesy.....service with a smile!
I would suggest you try to tilt the canister when you try to start it next time. Just a slight tilt in any one side of the canister filter to kick start it. The tilting process will direct any air that is present in the canister to flow out. Tilt it forward 1st to direct any air to go to the rear portion and side way to direct any remaining air toward the canister filter outlet. Switch on the canister while doing this procedure.
Also, check the entire hose line and see if there are any gaps in any of the connection. If your hose wasn't properly cut ie with jagged hose ends, trim the hose ends to have a nice cut edge. You wouldn't know if the jagged hose edge is actually letting air into the line.
If you've learnt, teach, if you have, give.
Don't walk behind me as I might not lead, don't walk in front of me as I might not follow. Walk beside me, as my friend.
Mohamad Rohaizal is my name. If it's too hard, use BFG. I don't mind.
i have tilted it in all directions and also shaked it - but the result is the same, no water movement at all
don't think there is any air in the canister, as i am able to siphon water out in the configuration below (with/without turning on the filter)
(inlet at waist level)
|
|
|
[filter at ground level] ------(outlet at ground level)
The problem that you describe sounds to me like a worn out rubber stopper. Is it rattling when you tried to run it for your tank ? If the canister has been decommed and dried out for a long period of time, the rubber stopper will shrink. Try pulling out ceramic shaft, does it come of easily without much effort ? if it does, it means you need to replace them. Y618 or C328 selles them for less than $20
for my case, the rubber stoppers are quite firmly attached to the filter, but easily detached from the ceremic shaft (highlighted in red)
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