Vaillant ecoCompact VSC 206/4-5: How to determine HwcDemand?

[Commifreak]

Hi,

I own an VSC 206/4-5 with VRC 700 and VR70:

I search a way to determine, if the hwc currently gets loaded or not. For the base hwx clearance I use SetMode disablehwc which is 0, when the boiler is allowed to make warm water (Faucet symbol). But this does not indicate, if its currently loading (blinking faucet).

So I searched trough the definitions and found:

• SetMode disablehc: This switches to 1 if hwc Storeage is actively loading but does not directly indicates it. AFter loading, the hc can be disabled as well (summertime, no heating needed). SO no good indicator
• broadcast HwcStatus does not get populated or is not supported. Always no value here
• bai HwcDemand is always Off
• 700 HwcFlowTemp is always 0°C

Any ideas? I could poll the state of the 3 way valve. But I wonder why the broadcast fields for hwc are not being supported :/

Maybe @john30 has a basic idea here?

Thanks!