Low flow for DHW and heating

[Jeroen_VR]

Currently having a problem with flow rate.

DHW: only 219 l/h. pump setting at 60%, but only shows 10%.

Heating: only 340l/h. pump setting at 90%, but shows 11%

Before (during spring and summer), the flow rates were much higher for DHW. Heating was turned off and not checked.

Started heating on 24th of November. 26th of November, strange curve. 

Could there be a blockage? float valve blocked? 

This is the first heating after commissioning in June. I assume the bleeding was done correctly during commissioning.

Running at 2417 software.

[Küstenpumpe]

Check Filter - Clean Filter !

Heating off for  Months ?  Check Pump for Function. Rotation ?

[Jeroen_VR]

It is a brand new system, all on underfloor heating. Already checked the magnet filter on the return (no dirt there). On 18th Nov, our heating engineer and viessmann expert will come back to check the system.

The system has only been running on DHW since commissioning because it was summertime and no heating was needed. The pump functions, but is not running at the setpoint (1102.0  1  2 etc...).

I saw higher flow rates before 800 - 600 l/h etc.. Since heating on UFH started, this dropped significantly, both on heating and DHW.

Any other recommandations for this team to check?

[Küstenpumpe]

Check Filter in the ODU, not the Magnetic One. 

[Küstenpumpe]

https://community.viessmann.de/t5/Waermepumpe-Hybridsysteme/Wartungsvideo-250-A-mit-Filterreinigung/...

https://www.youtube.com/watch?v=uHpXokxwE10

23min 50sec.