NIBE S-Series Heat Pumps

The Heat Pump has registered 5 repeated alarms for low low-pressure in the cooling circuit within 4 hours. This indicates an issue with the cooling system's pressure.

The Heat Pump has experienced 5 unsuccessful fan start attempts, or the display shows a fan alarm. This indicates an issue with the outdoor unit's fan operation.

The Heat Pump detects that the return line temperature is hotter than the flow line. This suggests that the temperature sensors for flow and return have been switched during installation or a major flow issue.

The Heat Pump has failed to complete 10 consecutive defrosting cycles. This can lead to ice build-up and reduced efficiency.

The compressor has stopped operation from the indoor section after less than 5 minutes of running. This indicates the Heat Pump is cycling on and off too frequently.

The Heat Pump has registered 3 repeated alarms for high discharge temperature within 4 hours. This indicates the compressor is running too hot.

The Heat Pump has registered 5 repeated alarms for low evaporation temperature within 4 hours. This indicates a problem with the refrigerant circuit and the heat absorption process.

The Heat Pump detects a communication fault with the inverter, with Alarm 203 displayed for 20 seconds. This means the main control board is not communicating properly with the inverter unit.

The Heat Pump has initiated 10 repeated defrosting cycles according to protection conditions. This indicates a persistent problem with ice formation or defrosting effectiveness.

The Heat Pump has registered 5 repeated low-pressure alarms within 4 hours. This indicates a consistent problem with low refrigerant pressure in the system.

The Heat Pump has registered 5 repeated high-pressure alarms within 4 hours. This indicates a consistent problem with high refrigerant pressure in the system.

The Heat Pump has detected an unspecified fault during inverter initiation. This could be due to incompatibility or a configuration issue with the inverter.

The system has detected 2 repeated LP/HP/FQ alarms within 2.5 hours, or a persistent pressure switch/over-temperature alarm. This indicates an ongoing issue with heating medium flow or temperature control.

The inverter has experienced a temporary fault 2 times within 60 minutes, leading to a safety stop. This indicates intermittent issues with the inverter's operation.

The inverter has experienced a temporary fault 3 times within 2 hours, leading to a safety stop. This indicates recurring intermittent issues with the inverter's operation.

The system has detected a mains disturbance, meaning a disruption in the supply voltage, 3 times within 2 hours or continuously for 1 hour. This can affect the stable operation of the Heat Pump.

The inverter has temporarily reached its maximum working temperature 3 times within 2 hours or continuously for 1 hour, indicating overheating.

The current supplied to the inverter has been too high 3 times within 2 hours or continuously for 1 hour. This indicates an electrical fault with the inverter or its power supply.

The inverter has temporarily reached its maximum working temperature 3 times within 2 hours or continuously for 1 hour, indicating persistent overheating.

A compressor phase is missing, detected 3 times within 2 hours or continuously for 1 minute. This means the compressor is not receiving full power.

The compressor has failed to start when required 3 times within 2 hours. This indicates a problem with the compressor's ability to initiate operation.

The output current from the inverter to the compressor has been temporarily too high 3 times within 2 hours or continuously for 1 hour. This suggests the compressor is drawing excessive current.

The power output from the inverter has been too high 3 times within 2 hours or continuously for 1 hour. This suggests the compressor is consuming excessive power.

The pressure difference between sensors BP9 and BP8 has been too low at compressor start 3 times within 30 minutes. This indicates the compressor is not effectively compressing refrigerant.

The compressor speed is below the lowest permitted speed, due to the inverter's safety function reducing the speed outside of the compressor’s working range. This indicates an issue preventing the compressor from running at its minimum effective speed.

The flow during defrosting is low. The display instructs to check the particle filter and pump. This hinders effective defrosting and can lead to ice build-up.

The Heat Pump has detected that the wrong base board (PCBA) has been installed or that the installed base board is not suitable for the S2125 model. This indicates a hardware mismatch.

The inverter has attempted to heat up the compressor but failed, resulting in heating not working. This indicates an internal fault within the inverter unit.

The discharge sensor (BT14) or high-pressure sensor (BP9) has come loose or is otherwise defective, leading to incorrect measurement values. This can affect compressor operation and system safety.

The Heat Pump's internal monitoring system has detected an open-circuit or short-circuit on the input for sensor BT3. This indicates a problem with the sensor itself or its wiring.

The Heat Pump's internal monitoring system has detected an open-circuit or short-circuit on the input for sensor BT12. This indicates a problem with the sensor itself or its wiring.

The Heat Pump's internal monitoring system has detected an open-circuit or short-circuit on the input for sensor BT14. This indicates a problem with the sensor itself or its wiring.

The Heat Pump's internal monitoring system has detected an open-circuit or short-circuit on the input for sensor BT15. This indicates a problem with the sensor itself or its wiring.

The Heat Pump's internal monitoring system has detected an open-circuit or short-circuit on the input for sensor BT16. This indicates a problem with the sensor itself or its wiring.

The Heat Pump's internal monitoring system has detected an open-circuit or short-circuit on the input for sensor BT17. This indicates a problem with the sensor itself or its wiring.

The Heat Pump's internal monitoring system has detected an open-circuit or short-circuit on the input for sensor BT28. This indicates a problem with the sensor itself or its wiring.

The Heat Pump's internal monitoring system has detected an open-circuit or short-circuit on the input for sensor BP8. This indicates a problem with the sensor itself or its wiring.

The Heat Pump's internal monitoring system has detected an open-circuit or short-circuit on the input for sensor BP9. This indicates a problem with the sensor itself or its wiring.

The Heat Pump's internal monitoring system has detected an open-circuit or short-circuit on the input for sensor BT84. This indicates a problem with the sensor itself or its wiring.

The green CPU LED on the base board (AA2) is off, indicating that the central processing unit (CPU) is not receiving power or is not active. This prevents the Heat Pump's control functions from operating.

The green CPU LED on the base board (AA2) is continuously lit instead of flashing, indicating that the central processing unit (CPU) is powered but not running its program correctly. This means the Heat Pump's control functions are impaired.

The green DEFROST LED on the base board (AA2) is flashing. This indicates that a protection function, other than active defrosting, is currently engaged to safeguard the Heat Pump.

The green DEFROST LED on the base board (AA2) is continuously lit. This indicates that the Heat Pump is currently undergoing a defrosting cycle to remove ice from the outdoor unit's evaporator.

The red ERROR LED on the base board (AA2) is flashing. This indicates that a temporary 'info alarm' is active. These alarms often resolve themselves but alert you to an operational condition.

The red ERROR LED on the base board (AA2) is continuously lit. This indicates that a continuous, active alarm is present. This is a more serious fault requiring attention.

The green EXT COM LED on the base board (AA2) is off, indicating that there is no communication between the Heat Pump and the NIBE indoor module or control module. This prevents control and status updates.

The room temperature is higher than desired or set, leading to discomfort. This usually points to incorrect system settings.

The green INT COM LED on the base board (AA2) is off, indicating that there is no internal communication between the Heat Pump's base board and the inverter. This is critical for compressor control.

Ice is building up on the outdoor unit's fan, grille, or fan cone. This can restrict airflow, reduce efficiency, and potentially damage the fan.

The domestic hot water supply is not reaching the desired temperature, or there is no hot water available. This problem specifically applies if the Heat Pump is docked to the hot water heater.

The room temperature is lower than desired or set. This can indicate an issue with heating demand, system settings, or the heating distribution.

The green PWR LED on the base board (AA2) is off, indicating that the main control board is not receiving power. The Heat Pump cannot operate without power to the base board.

The green PWR-INV LED is off, indicating that the inverter unit is not receiving power. The inverter is crucial for controlling the compressor.

The Heat Pump S2125 is not turning on or beginning its operation. This can be due to various reasons, including no demand for heating/cooling/hot water, temperature conditions, or an active alarm.

The Heat Pump S2125 is not communicating with its associated NIBE indoor module or control module. This prevents control, status monitoring, and alarm reporting.