BoilerFaultCodesWorcester Bosch 25/28si Fault Codes
Combi Natural GasLPG 25-28 kW 2001-2005 Discontinued
GC Numbers: 47-108-1047-108-11
Replaced by: Greenstar 25/30i
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
Central heating and hot water demand indicators flash together Central heating demand indicator flashes slowly (approximately once per second) Domestic water demand indicator flashes (approximately five times per second)
Your boiler has shut itself down because it has reached an internal temperature that is too high to operate safely.
May be DIY safe · £100-£250
Your boiler is trying to start up but cannot light the gas burner, so it has locked itself for safety.
May be DIY safe · £100-350
Your boiler has detected a safety issue with how it clears exhaust fumes, causing it to shut down to prevent potential danger.
Gas Safe engineer required · £120-350
All 3 fault codes
Worcester Bosch 25/28si 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.
Affiliate links — we may earn a commission at no extra cost to you.