NIBE F750 Heat Pump

The display shows a symbol indicating that the supplementary or 'additional' heat function is currently blocked. This means the electric immersion heater or other auxiliary heat source is not active, potentially due to system settings, a schedule, or an alarm.

After attempting to reset an alarm, if the status lamp continues to show a red light and an 'alarm' menu is still visible on the display, it signifies that the underlying problem causing the alarm has not been resolved. The malfunction is still present.

Starting the heat pump (moving switch SF1 to " " or " ") when the boiler has not been filled with water can cause permanent damage to critical components like the temperature limiter, thermostat, or immersion heater.

External communication and sensor cables may experience interference or provide incorrect readings if they are routed too close to high current cables within the installation, affecting the heat pump's operation.

This symbol appearing on the display indicates that the heat pump's compressor is currently blocked from operating. This can be an intentional state based on settings or a protective measure due to an active alarm.

An external switch function or sensor connected to the F750 (e.g., to AUX1-AUX5 or AA3:X7) is not functioning as expected. This usually means the input or output function for that connection has not been correctly selected in the heat pump's software.

The internal miniature circuit-breaker (FA1) has tripped, which protects components like the fan and circulation pumps. This can happen due to an electrical overload or a fault within the heat pump. It may also have tripped during transportation.

The heat pump's temperature limiter (FD1) has activated, cutting power to the electrical heating element. This happens if the internal temperature rises between 90°C and 100°C, indicating an overheating condition. It requires a manual reset.

The circulation pump, which moves water through the system, is not working. This might prevent proper heating or cooling. The pump may need manual assistance to start.

The indoor temperature is lower than desired, indicating that the heat pump is not effectively heating the living spaces. This problem typically does not trigger a display alarm.

The NIBE F750 is not producing hot water at the desired temperature, or there is a complete lack of hot water. This can be due to valve positions, system settings, or usage patterns.

The property's main fuse may trip if the heat pump's electrical addition operates simultaneously with many other high-power consumers. The F750 has integrated load monitors, but an overload can still occur.

The heat pump is experiencing an operational issue or is not functioning as expected, but no specific alarm message or symbol is shown on the display. This typically points to external power issues or tripped safety devices within the unit.

When an alarm occurs, the status lamp on the heat pump changes from a continuous green to a continuous red. Additionally, an alarm bell symbol appears in the information window on the display. This indicates a malfunction that the heat pump cannot automatically resolve.

The heat pump's ventilation system is not moving enough air, which can lead to inefficient heating/cooling and might cause moisture problems in the house.

The F750 display shows an incorrect room temperature, or the system isn't controlling the room temperature as expected. This can happen if the room sensor is not installed, not activated, or poorly placed.

If a software update is interrupted, for example by a power cut, the heat pump's software can be reset to its previous stable version. This helps restore functionality if the unit becomes unresponsive after an incomplete update.

Removing the USB memory from the heat pump while data logging is 'activated' can lead to data loss or corruption of the log files.