The Reconditioned NIBE 718273 main processor PCB with immersion heater connection manages heating operations, control signals and communication within compatible NIBE heat pump systems. Its dedicated immersion heater connection supports integrated backup or supplementary heating.

Product details

• Part number: 718273
• Component: Main processor printed circuit board (PCB)
• Condition: Reconditioned
• Function: Heating system control, communication and immersion heater integration

System compatibility

The existing product information lists the following NIBE models. Confirm the part number, system version and firmware requirements against your unit before ordering.

• F1145: Fixed-speed ground source heat pump
• F1155: Inverter ground source heat pump
• F1245: Ground source heat pump with integrated tank
• F1255: Inverter ground source heat pump with integrated tank
• F370: Exhaust air heat pump
• F470: Exhaust air heat pump with recovery
• F730: Inverter exhaust air heat pump
• VVM 320: Indoor control and water tank module
• VVM 225: Compact indoor module

Immersion heater control

A dedicated output controls the immersion heater, enabling automatic or manual backup heating when compressor capacity is insufficient. Sensor-driven switching supports energy-optimised operation.

System control and communication

• Manages communication with temperature sensors, pressure switches, fan and inverter control boards, and SMO/VVM modules where applicable.
• Coordinates compressor operation and pump control.
• Stores fault codes and logs for service diagnostics.

Installation and replacement

Modular, plug-and-play connectors are designed for straightforward replacement. A firmware version check may be required to match the system setup. Confirm compatibility before installation.

Fault symptoms to investigate

Symptoms associated with a possible control board fault include:

• The immersion heater failing to activate.
• The control panel freezing or crashing.
• Incorrect temperature readings from all sensors.
• Communication loss with SMO/VVM modules or outdoor units.
• Heating stopping without compressor errors.

These symptoms alone do not confirm PCB failure. Have the fault diagnosed before replacing the board.