BoilerFaultCodes Flashing light
Flame failure
Worcester Bosch 24 CBi Fault codes & diagnostics
10 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Gas 2000 onwards Discontinued
GC Number 41-311-48
Download the Worcester Bosch 24 CBi manual
PDF
Versions & GC numbers
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →
Severity at a glance
Each cell = one fault code. Hover to identify. 10 Unrated
Which version do you have?
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 41-311-48 | 24 CBi RSF | 2000–2001 |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
Just want the most common Worcester Bosch 24 CBi faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 10 documented codes
Tap any card for details
LED / flash-pattern codes
Lock-out (Flashing light)
Flame failure
Digital codes
FAULT POINT A
No lights at all
FAULT POINT B
Demand light only
FAULT POINT C
Burner light only
FAULT POINT D
Lockout light on constantly
FAULT POINT E
Lockout light flashing
FAULT POINT F
Other faults not covered by above
Lock-out (Steady light)
Overheat
Steady light
Overheat