Worcester Bosch Greenstar 24i Junior Fault codes & diagnostics

2 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural Gas 24 kW 2005-2013 Discontinued
GC Number 47-114-53

Replaced by: Greenstar 25i

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Fault codes

All 2 documented codes

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2 pulses (No light)

Your boiler has accidentally been set to a manual service mode and simply needs to be switched back to its normal operating setting.

Low DIY-safe

What to check first

  1. Locate the 'Service' button on the boiler control panel.
  2. Press and hold the 'Service' button for a few seconds until the light stops pulsing.
  3. The light should return to a steady state or turn off, indicating the boiler is back in normal mode.
Full explanation for 2 pulses (No light)
5 pulses (No light)

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.

Low DIY-safe

What to check first

  1. Locate the 'Service' button (usually marked with a spanner icon).
  2. Press and hold the Service button for a few seconds until the light stops pulsing.
  3. The boiler should return to its normal operating mode automatically.
Full explanation for 5 pulses (No light)