Vaillant 0020278881 PCB HMU (Hydraulic Management Unit)

The Vaillant 0020278881 is a genuine OEM HMU PCB (Hydraulic Management Unit printed circuit board) designed to control and coordinate the hydraulic functions within compatible Vaillant heating systems. This essential electronic component manages pump operation, sensors, valves, safety checks, and overall system communication to ensure safe, stable, and efficient performance.

Manufactured to Vaillant’s strict engineering standards, this PCB is the ideal replacement for restoring reliability when experiencing issues such as pump control faults, communication errors, irregular system behaviour, or HMU-related error codes.

Key Features:

• Genuine Vaillant HMU PCB

• Controls hydraulic management functions within the boiler/system

• Ensures accurate communication between sensors, pumps, and safety components

• Helps resolve PCB faults, system lockouts, or operational irregularities

• High-quality, durable OEM electronic construction

• Direct-fit replacement for compatible Vaillant appliances

• Suitable for professional installation and servicing

Compatibility

The Vaillant 0020278881 PCB HMU is compatible with selected Vaillant appliances, typically including:

• ecoTEC range (model dependent)

• ecoFIT and other Vaillant systems that list 0020278881 in their parts documentation

• Heat-only, system, or combi models where this HMU PCB is specified

Engineers should confirm exact compatibility using the boiler’s model-specific parts list or service manual.