Resetting A Worcester Bosch Greenstar Boiler

Posted on 29 May 2025 |

Refer to this guide to discover how to reset your Worcester Bosch Greenstar boiler

If your Worcester Bosch Greenstar boiler has unexpectedly ceased functioning or is showing a blinking blue light, a quick reset could be all it requires to start working again. This guide will take you through the reset procedure for your Worcester Bosch Greenstar boiler, assisting you in restoring heat and hot water swiftly and securely.

Common Reasons Why Your Worcester Bosch Greenstar Boiler Might Require a Reset

Grasping the reasons behind your boiler needing a reset can assist you in preventing recurring issues. The typical culprits are low water pressure, frozen condensate pipes in chilly weather, obstructed air vents, or problems with the thermostat. Additionally, power outages and disrupted gas supply can also activate a fault mode.

A straightforward reset of the Worcester Bosch Greenstar boiler usually resolves the issue, but if errors keep occurring, it might point to a more significant internal problem like a defective sensor, diverter valve, or heat exchanger. Be sure to look for any visible warning codes or blinking lights on the display panel, as these can offer valuable insights into the root cause of the problem. If your boiler requires frequent resets, it’s an indication that it needs the expertise of a professional. Regular maintenance and yearly servicing can assist in identifying minor issues before they escalate into expensive repairs.

Don’t overlook recurring issues—reach out to a certified engineer to make sure your home heating system operates safely and effectively.

Resetting the Worcester Greenstar CDi Classic Boiler

Required tools for bleeding your radiators:

Hold down the reset button [2] for three seconds.

Both the reset button [2] and the fault indicator [3] will cease flashing.

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

Resetting the Worcester Greenstar Si & CDi Compact Boiler

To initiate a reset of the boiler, simply press the “Reset” button.

You will see “Reset” along with a tick mark appear for a moment.

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

Resetting the Worcester Greenstar i Boiler

Simply press the reset button once for a brief moment.

You will see “Reset” along with a checkmark appear for a short time.

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

Resetting the Worcester Greenstar i Junior Boiler

If there is a fault, the reset button will blink once every second, and the blue mains indicator light will also be flashing.

To perform a reset on the boiler, hold down the reset button for about five seconds. Once the boiler has reset, the reset button will stop glowing.

The mains indicator light will cease to flash.

Resetting the Worcester Greenstar Ri Boiler

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

To reset the boiler, turn the Central heating temperature knob counterclockwise to the “RESET” position and hold it for about five seconds, then return the knob to its original temperature setting.

Once the boiler resets, the mains indicator light will stop flashing, and the boiler will operate normally, depending on the settings of the programmer and room thermostat. If the electrical power to the boiler has been interrupted, a reset fault condition will occur. Please reset the boiler as instructed 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 KCM Plumbing & Heating we have Gas Safe engineers on hand to come to your rescue, we can diagnose and repair your boiler quickly and efficiently. Get in touch

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