Name: Processor Main PCB with Immersion Heater Connection
Part Number: 718273
Function:
Acts as the central processing unit for managing heating operations, control signals, and communication within Nibe heat pump systems. Notably includes a dedicated immersion heater connection for integrated backup or supplemental heating.

System Compatibility

This main board is compatible with a wide range of Nibe systems, including both exhaust air and ground source models, as well as integrated hot water/backup control units:

Model    System Type
F1145    Ground source (fixed speed)
F1155    Ground source (inverter)
F1245    Ground source with integrated tank
F1255    Ground source with inverter + tank
F370      Exhaust air heat pump
F470      Exhaust air with recovery
F730      Exhaust air with inverter
VVM 320    Indoor control and water tank module
VVM 225    Compact indoor module

Key Features and Functions

Immersion Heater Integration

• Includes dedicated output for controlling an immersion heater

• Enables automatic or manual backup heating when compressor capacity is insufficient

• Supports energy-optimized operation via sensor-driven switching

System Control & Communication

• Manages communication between:

  • Temperature sensors

  • Pressure switches

  • Fan/inverter control boards

  • SMO/VVM modules (if applicable)

• Coordinates compressor operation and pump control

• Stores fault codes and logs for service diagnostics

Installation & Use

Features:

• Plug-and-play ready with modular connectors

• Designed for fast replacement

• May require firmware version check to match system setup

Common Faults Indicating Replacement

• System failing to activate immersion heater

• Control panel freezes or crashes

• Erroneous temperature readings from all sensors

• Communication loss with SMO/VVM or outdoor units

• Heating operation halting with no compressor errors