Learn To Reset Your Worcester Bosch Greenstar boiler

Posted on 21 May 2025 |

Follow this simple guide to learn how to reset your Worcester Bosch Greenstar boiler with ease

If your Worcester Bosch Greenstar boiler has unexpectedly stopped working or is showing a flashing blue light, a quick reset could be just what it needs to start working again. This guide will take you step-by-step through the reset process, helping you get your heat and hot water back on quickly and safely.

What Usually Causes Your Worcester Bosch Greenstar Boiler to Need a Reset

Knowing why your boiler needs resetting can help you avoid repeated issues. Common causes include low water pressure, frozen condensate pipes in cold weather, blocked air vents, or thermostat problems. Power outages and interruptions to your gas supply can also cause your boiler to go into fault mode.

While a simple reset of your Worcester Bosch Greenstar boiler often fixes the problem, persistent errors might point to a more serious issue like a faulty sensor, diverter valve, or heat exchanger. Keep an eye out for warning codes or flashing lights on the display panel—they can give you helpful clues about what’s wrong. If your boiler needs resetting often, it’s a sign that professional help is needed. Regular maintenance and annual servicing can catch small problems before they turn into expensive repairs.

Don’t ignore repeated faults—reach out to a qualified engineer to keep your heating system running safely and efficiently.

Worcester Greenstar CDi Classic Boiler Reset

To bleed your radiators, you’ll need these tools:

Press and hold the reset button [2] for three seconds.

The reset button [2] and fault indicator [3] will stop flashing.

If the reset worked, your boiler will get back to normal operation.
If it didn’t, the alert code will show again, and the blue operation/fault light will keep flashing.

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, your boiler will go back to normal operation.
If not, the alert code will appear again, and the blue operation/fault light will keep flashing.

Worcester Greenstar i Boiler Reset

To reset the appliance, simply press the reset button once briefly.

“Reset” and a tick is briefly displayed.

If the reset is successful, the appliance will return to normal operation.
If it’s not, the alert code will show up again, and the blue operation/fault light will keep flashing.

Worcester Greenstar i Junior Boiler Reset

If there’s a fault, the reset button will flash once every second, and the blue mains indicator light will flash too.

To reset the boiler, press and hold the reset button for about five seconds. When the boiler resets, the reset button light will turn off.

The mains indicator light will stop flashing.

Worcester Greenstar Ri Boiler Reset

In the event of 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 there for about five seconds, then turn the knob back to your original temperature setting.

Once the boiler resets, the mains indicator will stop flashing, and the boiler should work normally, depending on your programmer and room thermostat settings. If the boiler’s electrical power has been interrupted, a reset fault may occur—simply reset the boiler again following the steps above.

Is your boiler still not working?

Sometimes, unfortunately, resetting your boiler is not enough to get it back up and running again. If your boiler keeps going back into fault mode you will now need to call a Gas Safe registered engineer.

At SHS Heat, our team of Gas Safe registered engineers is ready to assist you. We specialise in quickly diagnosing and efficiently repairing boiler issues to get your heating and hot water back up and running. Get in touch

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