BoilerFaultCodesWorcester Bosch Two red lights flash rapidly Fault Code
Also written as TWOREDLIGHTSFLASHRAPIDLY — same fault.
The Worcester Bosch Two red lights flash rapidly fault code means: your boiler is currently in a manual service mode rather than standard operating mode because the adjustment dial on the control panel has been set to the minimum or maximum position.. It appears on 3 Worcester Bosch models in our database.
Technical description: Mode switch is set to MAX or MIN using the mode adjuster tool.
DIY fix possible
Locate the small rotary mode adjuster dial on the boiler control panel, often hidden behind a drop-down flap.Using a flat-head screwdriver, gently turn the dial out of the MAX or MIN position to the central 'Auto' or 'Normal' setting.Observe the lights to ensure they stop flashing rapidly and return to a steady state.
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Worcester Bosch models that show the Two red lights flash rapidly fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch Two red lights flash rapidly 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 31 August 2026