Green/Red - blinking Low

Worcester Bosch Green/Red - blinking Fault Code

Also written as GREENREDBLINKING — same fault.

The Worcester Bosch Green/Red - blinking fault code means: your boiler has detected a minor fluctuation in the water circulation system, but it is still operating safely and does not require immediate intervention.. It appears on 5 Worcester Bosch models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Warning mode (pump operating in an abnormal condition, no risk for the pump functionality).
Typical repair cost £90-180 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Worcester Bosch models that show the Green/Red - blinking fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch Green/Red - blinking fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026