Nibe Air Conditioning

This alarm occurs when there are 5 repeated alarms for low evaporation temperature within 4 hours. It indicates a problem with the refrigerant system's evaporation process.

This message indicates an incompatible setting related to 'Additional heat before QN10 without hot water'. Check the settings in menu 5.1.12.

The input for the BT7 sensor (Hot Water Sensor Top) is receiving an unreasonably high or low value for longer than 2 seconds. This indicates a sensor issue.

The input for the pool temperature sensor (BT51) is receiving an unreasonably high or low value for longer than 5 seconds. This causes the pool pump to stop.

The input for the pool temperature sensor (BT51) is receiving an unreasonably high or low value for longer than 5 seconds. This causes the pool pump to stop.

There is a sensor fault in the outdoor unit, indicated by 'Sensor fault from PCA 154 403'. Refer to the relevant manual for details.

There is a sensor fault in the outdoor unit, indicated by 'Sensor fault from PCA 154 404'. Refer to the relevant manual for details.

There is a sensor fault in the outdoor unit, indicated by 'Sensor fault from PCA 154 412'. Consult the relevant manual for guidance.

There is a sensor fault in the outdoor unit, indicated by 'Sensor fault from PCA 154 415'. Refer to the relevant manual for details.

The low-pressure transmitter in the outdoor unit is showing too low a value. This can be due to poor flow or significant wind effect.

The condenser outlet temperature has reached the maximum permitted level. This may be due to an incorrect heating curve setting or low heating medium flow.

The condenser inlet temperature has reached the maximum permitted level. This could be caused by incorrect heating curve settings or insufficient heating medium flow.

There is low pressure in the climate system. This is usually due to a leakage in the heating system or not enough water in the system.

The compressor stopped after running for less than 5 minutes. This can indicate issues with the heat transfer or incorrect heating/hot water settings.

Communication with an accessory has been missing for 15 seconds. A manual reset is required. Check the communication setup.

Communication with an accessory has been missing for 15 seconds. A manual reset is required. Check the communication setup.

This alarm indicates that the heat exchanger temperature has deviated 5 times within 60 minutes or has been continuously high for 60 minutes. This can lead to compressor blocking.

The Intelligent Power Module (IPM) has shown a fault output signal 5 times within 60 minutes, indicating the power transistor is too hot. This requires checking the 15V supply to the inverter.

The voltage from the inverter is outside the specified parameters, triggering this alarm 4 times within 30 minutes. This could be due to connection issues or inverter problems.

Communication between the inverter board and the control board/PCB is interrupted. This can be caused by faulty cables or defective components.

The inverter has temporarily reached its maximum working temperature due to poor cooling, for 15 minutes. This indicates an issue with the inverter's cooling or the unit's positioning.

Insufficient refrigerant was detected at start-up during cooling operation. The refrigerant level needs to be checked.

There was a failed start for the compressor. This could be due to a defective circuit board, compressor fault, or issues with the inverter.

An overcurrent fault occurred in the inverter module due to a sudden power failure. This requires checking the inverter's protection and power supply.

The evaporator sensor (Tho-R) has received an unreasonably high or low value 3 times within 40 minutes. This indicates a sensor issue.

The outdoor sensor (Tho-A) has received an unreasonably high or low value 3 times within 40 minutes. This points to a problem with the sensor.

The discharge sensor (Tho-D) has received an unreasonably high or low value 3 times within 40 minutes. This indicates a sensor fault.

The suction gas sensor (Tho-S) has received an unreasonably high or low value 3 times within 40 minutes. This suggests a fault with the sensor.

The low pressure sensor (LPT) has received an unreasonably high or low value 3 times within 40 minutes. This points to a sensor problem.

A temporary communication fault has occurred with the accessory board. Check communication cables, connections, and electrical supply.

The sensor BT74 on the AUX input is not connected or is defective, based on the selected measurement in the menu. Check the sensor and its connection.

A temporary communication alarm with the inverter has occurred 3 times within 2 hours. This requires a manual reset or has been active for 1 hour.

The pressure switch has been permanently triggered, indicating a persistent alarm. Check the main and group fuses and their cable connections.

A temporary fault in the inverter occurred 2 times within 60 minutes. Check the main and group fuses and their cable connections.

A temporary internal fault occurred in the inverter 3 times within 2 hours. Check the main and group fuses and their cable connections.

The phase voltage to the inverter has been too high 3 times within 3 hours or continuously for 1 hour. Check fuses, cable connections, and supply voltage.

The phase voltage to the inverter has been too low 3 times within 3 hours or continuously for 1 hour. Check fuses and cable connections.

Phase L2 to the inverter has been missing 3 times within 3 hours or continuously for 1 hour. Check fuses and connections.

A temporary inverter fault has occurred 3 times within 2 hours or has been continuous for 1 hour. Check fuses and connections.

The inverter has temporarily reached its maximum working temperature due to poor cooling, 3 times within 2 hours or continuously for 1 hour. Check installation and cooling.

The maximum input current to the inverter has been too high 3 times within 2 hours or continuously for 1 hour. Check fuses, connections, and voltage.

There has been no communication with the inverter for five days. Check the installation and ensure there has been communication for at least 60 seconds for automatic reset.

Communication with accessory AA34.2 has been missing for 15 seconds. A manual reset is required. Check the minimum calculated cooling supply setting.

Communication with accessory AA34.3 has been missing for 15 seconds. A manual reset is required. Check the minimum calculated cooling supply setting.

Communication with accessory AA34.4 has been missing for 15 seconds. A manual reset is required. Check the minimum calculated cooling supply setting.

Communication with accessory F135 has been missing for 15 seconds. A manual reset is required. Check the accessory's status.

The defrosting stop conditions in the exhaust air module have not been met for 3 hours. Manual reset is required. Check ventilation flow and exhaust air temperature.

A temporary communication fault has occurred with the base board (PCA Base). Check the communication cables and their connections.

A communication fault has occurred with the input board (PCA Input). Check the communication cables and their connections.

This symbol is displayed when the heat pump installation includes active solar accessories, indicating that solar energy is being utilized.

An alarm bell symbol appearing in the information window signifies a malfunction has occurred within the heat pump. This is usually accompanied by a solid red status lamp.

This symbol appears when a malfunction has occurred. It is usually accompanied by a red status lamp and an alarm message on the display.

Before addressing specific issues, perform these fundamental checks to ensure the system is correctly connected and supplied with power.

This symbol indicates that the additional heat function, such as an immersion heater, is blocked. This may be due to the operating mode, scheduled blocking, or an alarm.

This symbol appears in the display when the compressor is blocked. This can happen due to selected operating modes, scheduled blocking, or an active alarm.

There is no contact with the outdoor temperature sensor (BT1). This may be due to an open circuit or short circuit on the sensor input, or a defective sensor.

There is no contact with the hot water charging sensor (BT6). This can be caused by an open or short circuit on the sensor input, or a defective sensor.

There is no contact with the external supply temperature sensor (BT25). This could be due to an open or short circuit, or a defective sensor. Heating is blocked if this alarm occurs with alarm 25.

There is no contact with the solar panel sensor (BT53). This could be caused by an open or short circuit on the sensor input, or a defective sensor. The solar function may be switched off.

There is no contact with the flow sensor (BT63). This might be due to an open or short circuit on the sensor input, or the sensor itself is defective.

There is no contact with the external return line sensor (BT71). This may stem from an open or short circuit on the sensor input or a defective sensor. It can affect heating control.

The compressor light flashes to indicate an alarm has occurred in the cooling circuit. This means one of the pressostats has cut out. It may also indicate standby mode if the compressor is blocked.

This flashing light indicates that the air filter needs to be cleaned. This reminder typically appears every third month.

The 'Defrosting is operational/check filter' lamp stays lit when there is too much ice on the evaporator. The system will automatically defrost and then restart the compressor if heating is needed.

This alarm indicates a hot gas issue, triggering 2 times within 60 minutes or continuously for 60 minutes. Refer to the relevant manual for specific details.

The heat pump is not starting up for heating, cooling, or hot water production. This could be due to no demand from the system or internal conditions preventing startup.

The heat pump is unable to communicate with the indoor or control module. This prevents the system from operating correctly.

This alarm indicates a hot gas issue, with the alarm triggering 3 times within 4 hours. It suggests potential problems with the compressor or refrigerant system.

This symbol appears if the fan speed has deviated from its normal setting. This could be due to adjustments in operating modes or specific system requirements.

This alarm indicates that the condensation water collection system is blocked or full. The compressor will switch off to prevent further condensation.

Ventilation is too high or causing a disturbance, possibly due to a blocked filter or incorrect fan speed settings.

The room temperature is higher than desired, potentially due to automatic heating control settings or external switches.

This symbol indicates that the 'holiday setting' is currently active, meaning the heat pump is operating in an energy-saving mode for when the property is unoccupied.

There is a large amount of water accumulating beneath the F2050 unit. This may indicate a drainage issue or a requirement for an accessory.

The hot water produced by the heat pump is not reaching the desired temperature or there is no hot water available. Ensure settings are checked on the indoor or control module.

This indicates an issue with the hot water supply, potentially due to settings, consumption, or a blocked filter.

There is insufficient ventilation, possibly due to a blocked filter, incorrect settings, or an issue with the exhaust air device.

The low pressure pressostat indicates a fault condition related to low pressure in the system. Unlike the high pressure pressostat, this one typically resets automatically.

The indoor temperature is lower than expected. This could be due to heating system settings or air in the radiators.

The heating system pressure is too low, which can affect performance. The pressure gauge should normally be between 0.5 and 1.5 bar.

This symbol signifies that the F730 heat pump has a connection with the NIBE Uplink service, allowing for remote monitoring and control.

This symbol appears in the display when a periodic increase or 'lux mode' for hot water is activated, meaning the system is preparing extra hot water.

The pressure gauge on the F730 shows the heating system pressure. If it frequently drops to 0 bar or rises to 2.5 bar, it indicates a problem with the system's pressure.

The status lamp changing to a solid red light indicates a malfunction has occurred that the heat pump cannot fix on its own. An alarm bell will also appear in the information window.

A continuous red light on the status lamp indicates a serious malfunction that the heat pump cannot resolve by itself. This is often accompanied by an alarm message on the display.

The status lamp indicates a malfunction has occurred. An alarm bell symbol will also appear in the information window on the display.

There is no contact with the exhaust air sensor (AZ30-BT20). This may be due to an open or short circuit on the sensor input, or a defective sensor.

There is no contact with the exhaust air sensor (AZ30-BT21). This may be due to an open or short circuit on the sensor input, or a defective sensor.

There is no contact with the supply air sensor (AZ30-BT22). This can happen due to an open or short circuit on the sensor input, or a defective sensor.

A pressure reading consistently above 1.5 bar, especially if approaching 2.5 bar, indicates the heating system pressure is too high. This can be caused by thermal expansion issues or other system faults.

A pressure reading below 0.5 bar on the heating system gauge suggests the system may not have enough pressure to operate correctly. This could lead to insufficient heating.

The compressor is not running, which could be due to no heating demand, defrosting, temperature conditions, or minimum start time not being reached.

A continuous yellow light on the status lamp indicates that the heat pump is operating in emergency mode. In this mode, the building is heated by an immersion heater, but hot water is not produced.

The heat pump is in emergency mode. This is usually activated by a fault or when using the switch on the front panel. In this mode, the compressor is off and an immersion heater is used for heating. Hot water is not produced.