Chiller for 28g HQI Nano

[Sean]

I pick up the chiller this weekend, and I'm now having some problems with it. The water temp is really not affected at but the machine says its chilling and all is well.

Does anyone know what I could be doing wrong? I was thinking it could be that the pump isn't strong enough to push the water out. Right now i'm just using the pump that came with the Nano cube. Any suggestions? Id hate to drop more money on a pump if the ones I have are working fine. Also any suggestions on a new pump would be nice.

Thanks for all your help over the years guys, I know i'm a pain but before I die I will have a working aquarium