Wiessmann vitoplus 300, temp control.

sorlok72

Hi

I just moved into a house with a vitoplus 300 oil burner.

It has a non connected heating control system for the underfloor heating.
I was told to keep the thermostat in the biggest room 2 deg over set room temp in the boiler.

But it seems like no matter how low I set the boiler room temp the circulation pump keeps running. Even after the floor heating has closed the valves at 22deg

There is no separate temp sensor for the burner, so where is it measuring it ? At the return ?

Changing the room temp setting, I can hear the pump start and stop around the outdoor sensor temp.

In the manual it states I can check actual room value, but the procedure makes little sense.

Any input would be appreciated

Thanks