How to Perform a Reset on Your Worcester Bosch Greenstar Boiler

Resetting Your Worcester Bosch Greenstar Boiler in Minutes

If your Worcester Bosch Greenstar boiler has suddenly stopped working or is showing a flashing blue light, a quick reset might be all it needs to get going again. This guide will walk 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 Might Need Resetting

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

While a simple Worcester Bosch Greenstar boiler reset often fixes the issue, frequent errors might mean there’s a more serious problem inside, like a faulty sensor, diverter valve, or heat exchanger. Always look for warning codes or flashing lights on the display panel—they give important clues about what’s wrong. If you have to reset your boiler often, it’s time to get professional help. Regular maintenance and annual servicing can catch small problems before they turn into costly repairs.

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

Worcester Greenstar CDi Classic Boiler Reset

To bleed your radiators you will need the following 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 is successful, the boiler will return to normal operation.
If the reset is unsuccessful, the alert code will appear again, and the blue operation/fault light will keep flashing.

Worcester Greenstar Si & CDi Compact Boiler Reset

Press the “Reset” button to start the reset process.

“Reset” and a tick will briefly appear on the display.

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 continue to flash.

Worcester Greenstar i Boiler Reset

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

“Reset” and a tick will briefly appear on the display.

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

Worcester Greenstar i Junior Boiler Reset

When there’s a fault, the reset button flashes once per second and the blue mains indicator light flashes.

Press and hold the reset button for about five seconds to reset the boiler. The reset button light will go off once the reset is complete.

The mains indicator light will stop flashing.

Worcester Greenstar Ri Boiler Reset

The blue mains indicator light will flash to signal a fault.

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.

Once the boiler resets, the mains indicator light will stop flashing, and the boiler should operate normally, depending on your programmer and room thermostat settings. If the boiler loses electrical power, a reset fault may occur—simply repeat the reset process as described above.

Boiler still acting up?

Sometimes, resetting your boiler isn’t enough to get it working again. If your boiler keeps going into fault mode, it’s time to call a Gas Safe registered engineer.

AMW Plumbing & Heating has Gas Safe engineers ready to help you out — we’ll diagnose and fix your boiler quickly and efficiently. Request a boiler quote