“Wash F  :F265” or "Wash Flow F:F086” is displayed and buzzer sounds during start up or first operation after replacing the fiber filter in spite that the ball valve is open and pressure is applied. 

This is a known initial phenomenon caused by bubbles in the filter casing assembly.
It is not a system error.

→ Press the manual monitor switch to acknowledge the buzzer

→ Press the manual monitor switch again manually to start an analysis and fill the system with water

If the same alarm occurs, repeat this process several times.

One reason for this fault can be incorrect pressure conditions in the supply water pipe

→ Adjust the feed water pressure in a range between 0,5 und 5 bar

If the fine filter is changed while the voltage is applied to the device, the self-diagnostic mode does not start automatically.  → Press the MONITOR BUTTON to start an analysis manually → If the alarm occurs, repeat the manual analysis starts as described above.