NIBE Heat Pumps

The BT1 sensor, which measures a specific temperature, is either not connected or is faulty. When this alarm is active, the calculated flow temperature is set to its minimum value.

The BT10 sensor, which monitors brine inlet temperature, is either not connected or defective. If auto-control is selected, the GP2 pump will switch to manual speed. The system automatically resets when the sensor works correctly for 60 seconds, and GP2 returns to auto-control.

There is a permanent communication fault with the inverter, which is a critical component for compressor operation. This will block the compressor.

The BT1 sensor, which measures a specific temperature, is temporarily not detected by the system.

The BT2 sensor, which measures heating medium return, is temporarily not detected by the system.

The BT3 sensor, which measures heating medium return (hot water loading), is temporarily not detected by the system.

The BT4 sensor is temporarily not detected by the system.

The BT5 sensor is temporarily not detected by the system.

The BT6 sensor (hot water controlling) is temporarily not detected by the system.

The BT7 sensor (hot water peak) is temporarily not detected by the system.

The BT8 sensor is temporarily not detected by the system.

The BT9 sensor is temporarily not detected by the system.

The BT11 sensor, which measures the condenser outlet temperature, is not connected or defective. When this alarm occurs, the compressor is blocked.

The BT10 sensor (brine in) is temporarily not detected by the system.

The BT11 sensor (condenser out) is temporarily not detected by the system.

The BT12 sensor (condenser return) is temporarily not detected by the system.

The BT13 sensor is temporarily not detected by the system.

The BT14 sensor is temporarily not detected by the system.

The BT15 sensor is temporarily not detected by the system.

The BT16 sensor (evaporator) is temporarily not detected by the system.

The BT17 sensor is temporarily not detected by the system.

The BT12 sensor, which measures condenser return temperature, is not connected or defective. If the supply sensor (BT2) is also missing, both heating mode and compressor in hot water mode will be blocked.

The BT16 sensor for the evaporator is not connected or defective. This alarm typically resets automatically.

The BT2 sensor, typically monitoring the heating medium return temperature, is not connected or is faulty. This fault will block additional heating, and the system will use other available sensors for calculations if possible (e.g., BT3, BT63 for VVM 500).

The BT20 sensor, monitoring exhaust air, is not connected or defective. For ground source systems, the pump (AZ1-GP2) in FLM is blocked. For exhaust air systems, this alarm resets automatically.

The BT21 sensor, monitoring extract air, is not connected or defective. For ground source systems, the pump (AZ1-GP2) in FLM is blocked. For exhaust air systems, this alarm resets automatically.

The DEW-BT6 sensor, which controls the hot water in the extra water heater, is not connected or defective.

The BT25 sensor, monitoring the external heating medium return, is not connected or defective. This will block any external additives.

The AZ1-BT26 sensor, measuring the brine temperature entering the collector, is not connected or defective. This blocks the pump (AZ1-GP2) in FLM.

The BP8 sensor, responsible for detecting low pressure, is not connected or defective. This fault will block the compressor operation.

The BT71 sensor, which monitors the external heating medium return, is not connected or defective. No action is taken by the Heat Pump unless combined with alarm 25, in which case heat is blocked.

The BT29 sensor, which measures the compressor oil temperature, is not connected or defective. This fault will block the compressor from operating.

The BT3 sensor, often used for heating medium return, is not connected or defective. When this alarm occurs, the compressor will be blocked during hot water loading.

The BT63 sensor, located after the immersion heater in the heating medium supply, is not connected or defective. For VVM 500 units, this blocks internal electric addition. The alarm resets automatically.

The BS1 air velocity sensor indicates that the air flow is outside of its normal operating range. This alarm typically resets automatically and will block the compressor.

The EP30-BT53 sensor, which monitors solar collectors, is not connected or defective. This will block solar additive functions.

The EP30-BT53 sensor, which monitors the solar panel, is not connected or defective. This will block solar additive functions.

The EM1-BT52 sensor, which measures boiler temperature, is not connected or defective. This causes the shunt to close and the burner to shut down.

The EP21-BT2 supply sensor for heating system 2 is not connected or defective. The system will then control based on the return sensor (EP21-BT3).

The BT6 sensor, which controls hot water, is not connected or defective. For VVM 500 units, BT54 will be used as an alternative. This alarm typically resets automatically.

The BT7 sensor, which monitors hot water peak conditions, is not connected or defective. This alarm usually resets automatically.

There is a permanent communication fault with the accessory card for heating system 4. This means the system cannot reliably communicate with this component, blocking its operation.

There is a permanent communication fault with the accessory card for an additive with shunt. This prevents proper communication and blocks the accessory.

There is a permanent communication fault with the accessory card for the pool. This means the Heat Pump cannot reliably communicate with the pool accessory, blocking its operation.

There is a permanent communication fault with the accessory card for FLM (Flow/Level Module). This issue often points to installation problems, communication circuit faults, or incorrect configuration.

The Heat Pump has failed to complete its defrost cycle. This can happen if defrost stop conditions are not met for an extended period (F750) or if multiple defrosts occur in a short timeframe (F110). The compressor and immersion heater will be stopped.

There is a permanent communication fault with the SAM 40 accessory card, which is activated in menu 5.2. This prevents communication with the card.

There is a permanent communication fault with the accessory card for step-controlled additive heat. This prevents proper communication and blocks the accessory.

There is a permanent communication fault with the accessory card for Solar. This issue often points to installation problems, communication circuit faults, or incorrect configuration, blocking solar functions.

There is a permanent communication fault with the accessory card for HPAC (Heat Pump Auxiliary Control). This issue often points to installation problems, communication circuit faults, or incorrect configuration, blocking HPAC functions.

There is a permanent communication fault with the accessory card for the groundwater pump. This issue often points to installation problems, communication circuit faults, or incorrect configuration, blocking groundwater pump functions.

There is a permanent communication fault with the accessory card for hot water circulation (HWC). This issue often points to installation problems, communication circuit faults, or incorrect configuration, blocking HWC functions.

There is a permanent communication fault with the accessory card for DEW (Domestic Hot Water). This issue often points to installation problems, communication circuit faults, or incorrect configuration, blocking DEW functions.

There is a permanent communication fault with the accessory card for 2-pipes cooling. This issue often points to incorrect installation, communication circuit faults, or incorrect configuration, blocking the 2-pipes cooling function.

There is a permanent communication fault with the accessory card for 4-pipes passive cooling (PCD4). This issue often points to incorrect installation, communication circuit faults, or incorrect configuration, blocking the cooling function.

There is a permanent communication fault with the FJVM unit. This prevents proper communication and blocks the accessory.

There is a permanent communication fault with the room unit for zone 1. This prevents the Heat Pump from receiving information or controlling zone 1, blocking the room unit's operation.

There is a permanent communication fault with the room unit for zone 2. This prevents the Heat Pump from receiving information or controlling zone 2, blocking the room unit's operation.

There is a permanent communication fault with the room unit for zone 3. This prevents the Heat Pump from receiving information or controlling zone 3, blocking the room unit's operation.

There is a permanent communication fault with the room unit for zone 4. This prevents the Heat Pump from receiving information or controlling zone 4, blocking the room unit's operation.