Tunzes chirping sound

[nauti1us]

Looking for some advise. I have a pair of Tunzes on a controller. I've been noticing an intermittent chirping sound coming from one of the units. I think it's coming from one of the blue metal boxes that interfaces the pump to the transformer. When I unplug that unit, the chirping stops.

What can I do..?

Thanks in advance,

 

[fireiko]

I think that is the alarm that tells you that one of the pumps is jamming. You need to clean your pumps.