Tunze Stream 3 challenge

[Norwayeagle]

I have 2 Stream 3 6150 pumps where one has some problems, the pump has stopped and the blue light is blinking on the controller unit.
Both pumps are connected to a 7000 Smart controller, and are between 3 to 4 years old without any problems before now.

The pump has been cleaned and mounted correct.

Any other measures I can do to make it work?

 

[Brian Coulter]

It's got a 5 year warranty.