Yellow light blinking

[skidrow52]

Since 3 years I never had a problem with my Universal Osmolator 3155, today morning I noticed the pump noise of on/off I noticed on the controller the yellow light is flashing and with the blink the pump turns on and off continuously, tried to clean the pump contact with the controller, but nothing helped. I also tried a different power socket but its the same.
Please advise what should be replaced to fix this issue.

 

[skidrow52]

And by the way I bought it from an online store from US, dont remember which merchant though