Wiring Diagram Worcester Greenstar

By | July 18, 2021



Understanding the Wiring Diagram of a Worcester Greenstar Boiler



Having a reliable boiler is essential for any home. A boiler that can be trusted to work efficiently and reliably is an important part of home comfort. For this reason, many homeowners choose a Worcester Greenstar boiler for their heating system. The wiring diagram for these boilers can be complex and confusing, so it is important to understand the basics of how it works before attempting a DIY installation.

The Worcester Greenstar boiler is made up of several components that all need to be connected correctly in order for the boiler to function. This includes the various controls and sensors that help the boiler to operate. In order to get the most out of your boiler, understanding the wiring diagram is essential. In this article, we will provide an overview of the wiring diagram for a Worcester Greenstar boiler, including the components and connections used.

Components of the Wiring Diagram



A Worcester Greenstar boiler wiring diagram can be broken down into several parts. The main components include:

  • Boiler Control Unit (BCU)

  • Boiler Sensor Unit (BSU)

  • Boiler Combustion Unit (BCU)

  • Burner Control Unit (BCU)

  • Flue Gas Analysis Unit (FGAU)

  • Thermostat and Actuator Unit (TAU)

  • Zone Pump/Valve Unit (ZPU)



These components form the basic wiring diagram of a Worcester Greenstar boiler. The BCU controls the burner, while the BSU collects data from the sensors. The BCU monitors the combustion process, while the FGAU measures the flue gas analysis. The TAU regulates the thermostat and the actuator, while the ZPU manages the heating zone. All of these components must be properly connected for the boiler to function.

Wire Connections



Each component of the Worcester Greenstar boiler has its own series of wires that connect it to the other components. The following table provides an overview of the wire connections and their functions:






















Connection Function
Boiler Control Unit (BCU) - Boiler Sensor Unit (BSU) Transfers data to the BCU and receives signals from the BSU
Boiler Control Unit (BCU) - Boiler Combustion Unit (BCU) Controls the combustion process
Burner Control Unit (BCU) - Flue Gas Analysis Unit (FGAU) Monitors the flue gas analysis
Thermostat and Actuator Unit (TAU) - Zone Pump/Valve Unit (ZPU) Regulates the temperature and pumps for the heating zone


All of these connections must be correctly made for the boiler to operate correctly. It is important to ensure that all of the connections are secure and functioning correctly. If any connection is loose or not working, the boiler may not operate correctly.

Safety Considerations



When installing a Worcester Greenstar boiler, it is important to take safety into consideration. Always be sure to turn off the power before attempting any work on the boiler. Additionally, make sure to follow the instructions provided in the user manual carefully. Failing to do so could result in serious injury or damage to property.

Furthermore, if any part of the wiring diagram does not seem to make sense, it is best to consult a certified boiler technician. Attempting to install or repair a boiler on your own can put yourself and others at risk.

In conclusion, understanding the wiring diagram of a Worcester Greenstar boiler is essential for anyone looking to install or maintain one. Taking the time to familiarize yourself with the components and connections can help ensure that your boiler is installed and operated correctly. However, it is important to always take safety into consideration when working on any boiler.


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