The NIBE Air Velocity Sensor – Part No. 519579 is the official airflow/air‑speed sensor used in several NIBE exhaust‑air heat pump systems (F7x0 series).

What the NIBE Air Velocity Sensor 

It measures airflow speed in the exhaust duct and sends that data to the heat pump’s control system. The F730/F750 use this sensor to regulate fan speed, ensure correct ventilation rates, and protect the compressor.

Functions include:

• Monitoring exhaust airflow

• Ensuring correct ventilation balance

• Detecting blockages or duct restrictions

• Providing feedback for fan modulation

• Triggering alarms if airflow is too low/high

It is a critical safety and efficiency component.

Where It Is Used:

The 519579 sensor is typically installed:

• In the exhaust air channel

• Upstream of the heat pump’s heat exchanger

• Connected to the low‑voltage sensor harness on the splice card

Compatible with:

• NIBE F730

• NIBE F750

• Some F7x0 variants depending on region

Typical Failure Symptoms:

If this sensor fails, you may see:

• Airflow alarm or “Low ventilation” warnings

• Fan running at maximum speed constantly

• Heat pump reducing output due to insufficient airflow

• Incorrect ventilation rates

• System shutting down during DHW production