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How to reset a Worcester Bosch Greenstar boiler

Resetting Your Worcester Bosch Greenstar boiler

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Use this guide to learn how to reset your Worcester Bosch Greenstar boiler.

If your Worcester Bosch Greenstar boiler has unexpectedly shut down or is showing a flashing blue light, performing a quick reset could resolve the issue. This guide will take you step-by-step through the reset process, helping you safely restore your heating and hot water in no time.

Typical Causes That May Require Resetting Your Worcester Bosch Greenstar Boiler

Understanding why your boiler requires resetting can help prevent recurring faults. Common causes include low water pressure, frozen condensate pipes during cold weather, blocked air vents, or thermostat problems. Additionally, power outages and interruptions to the gas supply can trigger fault modes.

While a simple reset of your Worcester Bosch Greenstar boiler often resolves the issue, persistent errors may point to more serious internal faults such as a malfunctioning sensor, diverter valve, or heat exchanger. Always pay attention to warning codes or flashing lights on the display panel, as these provide important clues to the root cause. If your boiler regularly needs resetting, it’s a clear sign that professional inspection is necessary. Regular maintenance and annual servicing can help identify minor problems early and prevent costly repairs down the line.

If faults keep recurring, don’t delay—reach out to a qualified engineer to keep your home heating system safe and efficient.

Worcester Greenstar CDi Classic Boiler Reset

Tools needed to bleed your radiators:

  • Press and hold the reset button [2] for three seconds.
  • The reset button [2] and fault indicator [3] will stop flashing, indicating the reset is complete.

    • If the reset is successful, the boiler will resume normal operation.
    If the reset fails, the alert code will reappear, and the blue operation/fault light will keep flashing.

    Worcester Greenstar cdi classic reset

    Worcester Greenstar Si & CDi Compact Boiler Reset

  • To reset the boiler, press “Reset”.
  • “Reset” and a tick is briefly displayed.
  • If the reset is successful, the boiler will return to normal operation.
  • If the reset is not successful, the alert code will be displayed again, and the blue operation/fault light will continue to flash.

    • If the reset is successful, the boiler will resume normal operation.
    If the reset is unsuccessful, the alert code will reappear and the blue operation/fault light will keep flashing.

    Worcester Bosch boiler reset

    Worcester Greenstar i Boiler Reset

  • Press the reset button once briefly to reset the appliance.
  • The word “Reset” and a checkmark briefly appear on the display.

    • If the reset is successful, the appliance will resume normal operation.
    If the reset is unsuccessful, the alert code will reappear, and the blue operation/fault light will keep flashing.

    Worcester bosch greenstar I reset

    Worcester Greenstar i Junior Boiler Reset

    If a fault occurs, the reset button will flash once every second, and the blue mains indicator light will also flash.

  • Press and hold the reset button for about five seconds to reset the boiler. Once the reset is complete, the reset button light will turn off.
  • The mains indicator will no longer be flashing.

    • Worcester Bosch Greenstar I junior reset

    Worcester Greenstar Ri Boiler Reset

    If there is a fault, the blue mains indicator light will flash.

  • To reset the boiler, turn the central heating temperature knob anticlockwise to the “RESET” position and hold it for about five seconds. Then, turn the knob back to your original temperature setting.
  • When the boiler resets, the mains indicator light will stop flashing, and the boiler will operate normally, depending on your programmer and room thermostat settings. If the electrical power to the boiler has been interrupted, a reset fault condition may occur. In this case, reset the boiler following the steps described above.

    • Worcester boiler Ri boiler reset

    Is your boiler still not working?

    Sometimes, unfortunately, resetting your boiler won’t be enough to restore it. If your boiler repeatedly goes into fault mode, it’s time to call a Gas Safe registered engineer.

    Hynes Plumbing & Heating has Gas Safe registered engineers ready to assist you. We can quickly and efficiently diagnose and repair your boiler to get your heating back up and running. Get in touch

    Hynes Plumbing and Heating
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