If your Worcester Bosch Greenstar boiler suddenly stops working or shows a flashing blue light, a quick reset might do the trick to get it back up and running. This guide will walk you through the reset process step-by-step, so you can quickly and safely restore your heat and hot water.

Typical Causes for Resetting Your Worcester Bosch Greenstar Boiler

Knowing why your boiler needs a reset can help you prevent the same problems from happening again. The most common reasons include low water pressure, frozen condensate pipes in cold weather, blocked air vents, or thermostat issues. Power outages and interruptions to the gas supply can also cause the boiler to go into fault mode.

While a quick reset of your Worcester Bosch Greenstar boiler often fixes the problem, repeated errors might mean there’s a bigger issue inside—like a faulty sensor, diverter valve, or heat exchanger. Keep an eye out for warning codes or flashing lights on the display, as these give helpful hints about what’s wrong. If you find yourself resetting your boiler a lot, it’s a good idea to get a professional to take a look. Regular maintenance and yearly servicing can catch small problems early, saving you from expensive repairs down the road.

If your boiler keeps having faults, don’t ignore them—reach out to a qualified engineer to make sure your heating system is working safely and efficiently.

Worcester Greenstar CDi Classic Boiler Reset

To bleed your radiators, you’ll need the following tools:

If the reset was successful, the boiler will return to normal operation.
If the reset wasn’t successful, the alert code will show again, and the blue operation/fault light will keep flashing.

Worcester Greenstar Si & CDi Compact Boiler Reset

If the reset works, your boiler will go back to normal and start working as usual.
If it doesn’t, the alert code will show up again, and the blue operation/fault light will keep flashing.

Worcester Greenstar i Boiler Reset

If the reset is successful, the appliance will go back to normal operation.
If it’s not successful, 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.

Worcester Greenstar Ri Boiler Reset

If there’s a fault, the blue mains indicator light will start flashing.

Still having trouble with your boiler?

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 Matt Grange, our Gas Safe engineers are ready to come to your rescue. We’ll diagnose and repair your boiler quickly and efficiently. Get in touch