Name: Main Controller PCB (PWB1) with Cables
Part Number: 718783
Function:
The PWB1 is the central control board of the Nibe F2040 8kW air source heat pump. It plays a critical role in managing and coordinating various subsystems including the inverter, fan, sensors, and overall system logic.

It is supplied with factory-matched cables to connect directly to key components:

• Inverter PCB

• Capacitor Module

System Compatibility

Specifically Designed For:

• Nibe F2040 – 8kW model only

This board is not interchangeable with other F2040 kW variants due to differing communication architecture and control logic.

Functional Scope

Core Responsibilities:

• Controls system communication protocols

• Processes sensor input for temperature, pressure, etc.

• Manages fan control and speed modulation

• Directs inverter operation to modulate compressor speed and energy efficiency

• Interfaces with other peripheral boards via data cables

Typical Fault Indicators

You may need to replace this board if you experience:

• Communication Alarms:

  • “Loss of inverter comms”

  • “No response from module”

• Fan Errors:

  • Fan not running or signal mismatch errors

• Sensor Anomalies:

  • Wrong temperature readings

  • Erratic system cycling

  • Unexplained lockouts or “ghost faults”

These symptoms often suggest a failing or corrupted controller card, rather than peripheral sensor or actuator issues.

Location & Installation

• Physical Location:
  Internally housed in the outdoor unit's control compartment of the Nibe F2040 8kW.

• Wiring:
  Pre-supplied with all required cables for:

  • Inverter PCB connection

  • Capacitor module

  • Internal signal paths

• Installation Tips:

  • Ensure complete power isolation before removing the old PCB

  • Take note of cable routing and port identifiers for a clean swap

  • Perform a full system reset after installation and check firmware compatibility