WB
Worcester Bosch Fault Codes
Select a fault code to see its meaning, common causes and how to fix it.
- A1 The A1 fault code on a Worcester Bosch boiler signals a water circulation problem. The boiler has detected that water… Read more →
- C6 The C6 code is a fan fault. It means the boiler's control board has detected that the fan is either not running,… Read more →
- D5 The D5 code on a Worcester Bosch boiler signals that the appliance has shut down to protect itself, but the exact… Read more →
- E9 The E9 code on a Worcester Bosch boiler is an overheat lockout. It tells you the safety temperature limiter on the… Read more →
- EA The boiler has failed to detect a flame during ignition (flame detection failure) and has locked out for safety. Read more →
- F0 The F0 is Worcester Bosch's general internal fault code. It tells you the boiler's control system has detected a… Read more →