Hello Petitreef,

I had exactly the same problem with my new ghl doser maxi 2.2! The update to version 1.44 did not bring any improvement either. But i would still run update 1.44.

And here's my solution:

clean the pump, hoses and rollers completely from this grease with kitchen paper! It is best to clean it with a little alcohol at the end. Then spray all parts with a silicone spray. I used one for the food industry. Do not use Vaseline!

Since then I've had no problems with my doser maxi 2.2

Nature_Aquaristic_RT