This guide will show you how to reset your Worcester Bosch Greenstar boiler

If your Worcester Bosch Greenstar boiler has unexpectedly stopped working or is showing a flashing blue light, a simple reset may be all that’s needed to get it working again. This guide will take you through the reset process step by step, helping you restore your heating and hot water quickly and safely.

Common Reasons Your Worcester Bosch Greenstar Boiler May Need a Reset

Understanding why your boiler needs resetting can help prevent recurring issues. Common causes include low water pressure, frozen condensate pipes in cold weather, blocked air vents, and thermostat problems. Power outages or interruptions to the gas supply can also cause the boiler to enter fault mode.

Resetting your Worcester Bosch Greenstar boiler often fixes the problem. But if the errors keep happening, it could mean there’s a bigger issue inside, like a broken sensor, valve, or heat exchanger. Check the boiler’s display for warning codes or flashing lights—they give important clues about what’s wrong.

If you find yourself resetting the boiler a lot, it’s best to call a qualified engineer. Regular maintenance and yearly servicing can catch small problems early, saving you from expensive repairs later.

Don’t ignore repeated problems—getting a professional to check your boiler helps keep your home heating safe and efficient.

Worcester Greenstar CDi Classic Boiler Reset

To bleed your radiators, you will need the following tools:

If the reset is successful, the boiler will return to normal operation.
If the reset is not successful, the alert code will reappear, and the blue operation/fault light will keep flashing.

Worcester Greenstar Si & CDi Compact Boiler Reset

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.

Worcester Greenstar i Boiler Reset

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

Worcester Greenstar i Junior Boiler Reset

In the event of a fault, the reset button will flash once per second, and the blue mains indicator light will flash.

Worcester Greenstar Ri Boiler Reset

In the event of a fault, the blue mains indicator light will flash.

Still having boiler issues?

At times, resetting the boiler alone won’t restore it to normal operation. If your boiler keeps going back into fault mode you will now need to call a Gas Safe registered engineer.

At Koziwarm, our Gas Safe engineers are ready to help you. We can quickly and efficiently diagnose and repair your boiler. Get in touch today.