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:

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

Design & Build

• Robust processor design with integrated surge and interference protection

• Optimized for long service life in variable operating conditions

• Embedded watchdog timer and fail-safe features

Installation & Use

Features:

• Plug-and-play ready with modular connectors

• Designed for fast replacement

• May require firmware version check to match system setup

Installer Notes:

• Ensure full power isolation prior to removal

• After replacement:

  • Check immersion heater operation via the menu or diagnostics interface

  • Reset or restore system settings if needed

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