Problems with controlled residential ventilation and chimney stove

Our single-family house is equipped with a controlled residential ventilation system and a wood stove operated independently of the indoor air. The stove draws its air through the air-flue chimney. The wood stove is approved for operation in indoor spaces equipped with supply and exhaust ventilation systems. I thought that this would cover everything and no further measures would be necessary. However, the chimney sweep now requires a certificate from the ventilation system manufacturer stating that no negative pressure over four pascals occurs during operation. According to the manufacturer, the device is not capable of measuring pressure differences and recommends installing a differential pressure monitor. Is this really necessary? What other inexpensive solutions are there?

You would have to arrange that together with the chimney sweep and the manufacturer of the ventilation system. One knows the regulations very well (and can not only reprimand but also help to comply with these regulations), the other knows their device very well. I myself have not had such a problem yet.

I don't know anything like that either. But it's really annoying when the company that installed it doesn't follow the regulations.

I think you need to have a differential pressure switch installed. Some ventilation installers tend to tell their customers that the chimney sweep does not need to be involved. I consider this statement to be wrong.

At this point, there is no good cooperation. The chimney sweep is responsible on site, and I would involve this specialist during the installation.

I haven't had this problem either, but for me it is clear that the chimney sweep is the first point of contact. The manufacturer can tell me whatever they want.