Tunze Control box squeal

[Warnberg]

One of my tunze blue control boxes is squealing, like a long beep then back off then back on... what is this? anyone have this happen before?

 

[Warnberg]

Well I found it... the impeller was gummed up with coraline algae and would not turn so the control box screams about it. Anyway a good cleaning of the impeller and inside the impeller housing fixed it right up. So note to self, clean the whole thing not just the outside....

Lesson learned

 

[Saliki]

Ya, some of the tunze stuff actually have a stuck alarm on them to warn you.....and then i think they will shut off so they dont burn up. Gotta love the Germans!