Marco up3e -> RED/BLUE flashing -> Liquid not detected

Hi, recently I have changed old pressure switch controlled pump for electronic controlled pump. Pump works fine and has enough pressure, there isn't any air present in the water, but after 1.5 min of runtime( when taking shower) the pump stops and Red/Blue light is flashing. Power restart helps straight away. User manual says "Liquid not detected", but there isn't obviously problem with water which runs perfectly. I tried everything, bleed air several times, remove expansion tank from the system, check all barbs and connection, but problem still remains.

Any idea whats wrong with my pump?

Thanks for answer!

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