BoilerFaultCodes.com

Worcester Bosch Greenstar 24i Junior Fault Codes

Combi Natural Gas 24 kW 2005-2013 Discontinued
GC Number: 47-114-55

Replaced by: Greenstar 25i

This boiler uses indicator light combinations

Note which lights are on, off, or flashing and at what speed. Match the combination to the table below. Do not reset until you have noted the pattern. How to read fault codes →

Most common fault codes

Fast flash (Lockout reset button Flashing)
Your boiler has detected an internal computer error and has stopped working for safety reasons.
Gas Safe engineer required · £250-450
Fast flash (Lockout reset button Off)
Your boiler has safety-locked itself because it has detected an internal component failure or a communication error between sensors and the control board.
Gas Safe engineer required · £120-350
Slow flash (normally off, flashes on)
Your boiler has tried to light several times but cannot establish a flame, meaning your heating and hot water will not work.
May be DIY safe · £120-450

All 6 fault codes

Code Severity Plain English
2 pulses (No light) Low Your boiler has accidentally been set to a manual service mode and simply needs to be switched back to its normal operating setting.
5 pulses (No light) Low Your boiler isn't broken; it has simply been left in a manual 'test mode' used by engineers, and needs to be switched back to its normal setting.
Fast flash (Lockout reset button Flashing) High Your boiler has detected an internal computer error and has stopped working for safety reasons.
Fast flash (Lockout reset button Off) High Your boiler has safety-locked itself because it has detected an internal component failure or a communication error between sensors and the control board.
Slow flash (normally off, flashes on) High Your boiler has tried to light several times but cannot establish a flame, meaning your heating and hot water will not work.
Slow flash (normally on, flashes off) High Your boiler has likely overheated or detected a blockage in the chimney pipe, causing it to shut down for safety.

Worcester Bosch Greenstar 24i Junior is discontinued — time for a new one?

Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.

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