BoilerFaultCodes.com

Worcester Bosch CDi Classic Fault Codes

Combi Natural GasLPG 29-42 kW 2012-2019 Discontinued
GC Numbers: 47-311-8547-311-8747-311-89

Replaced by: Greenstar 8000 Life

The fault code is already on your display

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

Most common fault codes

A1
Your boiler has detected that there is not enough water circulating through the system, which could be due to a leak or a mechanical issue with the pump.
Gas Safe engineer required · £180-£350
A7
Your boiler's hot water sensor has failed or has a broken connection, meaning you likely won't have any hot water.
Gas Safe engineer required · £90-160
A8
Your boiler has lost its connection to the external heating controls, meaning it cannot receive instructions on when to turn on or off.
Gas Safe engineer required · £90-£250

All 12 fault codes

Code Severity Plain English
A1 High Your boiler has detected that there is not enough water circulating through the system, which could be due to a leak or a mechanical issue with the pump.
A7 High Your boiler's hot water sensor has failed or has a broken connection, meaning you likely won't have any hot water.
A8 High Your boiler has lost its connection to the external heating controls, meaning it cannot receive instructions on when to turn on or off.
B1 High Your boiler's computer memory chip is loose or missing, meaning the system doesn't know which model it is and has stopped working for safety.
C6 High Your boiler has stopped working because the internal fan, which safely removes waste gases, is not spinning fast enough.
E2 High Your boiler has detected a fault with the sensor that monitors the temperature of the water leaving the unit, preventing it from heating your home safely.
E9 High Your boiler has sensed that it is getting too hot and has automatically shut down for safety.
EA High Your boiler has stopped working because it cannot light a flame, most likely due to an interruption in the gas supply or a part that has worn out.
F0 High Your boiler has experienced an internal electrical communication error, which means the main control box cannot talk to the internal components correctly.
F7 High Your boiler thinks it sees a flame even though it should be turned off, which prevents it from starting up safely.
FA Emergency Your boiler is still detecting a flame even after it has been told to shut down, which indicates a potential safety issue with the gas supply inside the unit.
FD Low Your boiler has entered a temporary standby mode because the reset button was pressed accidentally or held down for too long.

Worcester Bosch CDi Classic 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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