XP2 not working correctly

how far up is the water inside the canister? i occasionally get this issue with my rena xp after maintenance if the canister does not prime fully (water does not come up high enough inside the canister).

unplug the canister from the wall. do not lift up the lever on the hose assembly at all. lift one clamp on the canister lid slowly. watch for the water to come up a bit inside the canister. lock that clamp back down once the water comes up just above the blue part of the canister top/motor housing/lid that sits inside the canister. this should help.

hope that wasn't too confusing.

another issue that might be the cause is your o-rings and seals may need replacing. these do wear out after some time, and allow air into the canister, causing the air issue you describe. it is difficult to notice worn areas on the o-rings (the square one around the outside of the canister lid, as well as the round one in the middle underside of the canister lid) unless you take the o-rings out and very closely inspect them.

The only moving part is the impeller. Remove it, and make sure it's intact, and that it functions correctly. To test it, hold it by the magnet and see how far you can spin the little propeller. If it spins all the way around and around it's bad, replace it. It should only spin about a half turn in each direction and then hit a stop. Also the magnet should be smooth. If it's really badly grooved it could be the problem, but usually the just get noisier as the grooves develop.

It's either sucking air, which indicates a bad seal or sealing, or there is trapped air inside.
I suspect the latter.
What I do, is shake the filter while it's running, then unplug it for a minute or so, then plug it back in. Some times it takes a couple of cycles. If that doesn't do the trick, I take it apart again, clean up the O-ring grease, and put it back together again.

the trapped air most likely worked its way out of the filter. good to hear it's running properly now.