coral box DCA6000 overflow - blocked

[Tony73]

hello

i've my return pump coral boc dca 6000 blocked, it's flashing controller with 2 leds on the left and 2 leds on the right

i've cleaned the pump under hot water, but it's again blocked with same issue

anyone know how to solve it, please?

kind regards
Antonio

 

[Ron Reefman]

Try soaking it in white vinegar.