BoilerFaultCodes.com

Worcester Bosch 29 HE Conventional Fault Codes

Regular Natural GasLPG 29 kW 2003-2007 Discontinued
GC Number: 41-311-73

Replaced by: Greenstar Ri

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

5.2
Your boiler is struggling to light the gas safely, which means your heating and hot water have stopped working.
Gas Safe engineer required · £120-280
9.3
Your boiler has detected an internal electronics failure that is preventing it from safely lighting the gas to heat your home.
Gas Safe engineer required · £280-450
A5
Your boiler has detected an internal communication error or a sensor problem that is preventing it from heating your home safely.
Gas Safe engineer required · £120-280

All 30 fault codes

Code Severity Plain English
0 Low Your boiler is currently running a self-cleaning cycle to remove air bubbles from the pipes and pump.
1. Low Your boiler is performing a routine self-cleaning and safety check to fill up its internal condensate trap.
5.2 High Your boiler is struggling to light the gas safely, which means your heating and hot water have stopped working.
9.3 High Your boiler has detected an internal electronics failure that is preventing it from safely lighting the gas to heat your home.
A5 High Your boiler has detected an internal communication error or a sensor problem that is preventing it from heating your home safely.
A7 High Your boiler has detected a problem with the sensor that monitors hot water temperature, which often means it cannot heat water correctly or has stopped for safety.
A8 High Your boiler's internal computer has lost contact with the main control system, meaning the components cannot talk to each other to start the heating process.
AC High Your boiler's main control unit has lost communication with one of its electronic plug-in modules, meaning the system cannot talk to itself correctly.
Ad High Your boiler has detected an internal error and has entered a lock-out mode to prevent any further issues.
b1 High Your boiler has lost communication with a small internal component that tells the main computer what specific model it is.
C1 High Your boiler's fan is not spinning fast enough to safely clear away exhaust fumes, so the system has shut down as a precaution.
C4 High Your boiler has stopped working because the internal fan that clears away waste gases is not spinning fast enough to operate safely.
C6 High Your boiler has detected that the internal fan is spinning too fast, which prevents the system from starting up safely.
CC High Your boiler has detected an internal electronic error, often meaning it has lost its basic settings or a key component is disconnected.
E2 High Your boiler has stopped working because it cannot correctly measure the temperature of the water leaving the unit, usually due to a faulty internal sensor or wiring issue.
E9 High Your boiler has sensed that it is getting too hot and has automatically shut down to prevent damage or safety issues.
EA High Your boiler has failed to light because it cannot detect a flame, likely due to a temporary interruption in the gas supply or a blockage in the drainage pipe.
F0 High Your boiler has experienced an internal communication failure or a software glitch on the main control board.
F7 High Your boiler thinks it sees a flame even though it hasn't been told to turn on, which is often caused by a false signal from a sensor or a moisture issue.
FA Emergency Your boiler is still detecting a flame even though it has tried to turn the gas off, which is a safety conflict that requires a professional inspection.
Fd Low Your boiler is simply reporting that the reset button was held down for too long or pressed when there wasn't a fault to clear.
None Medium Your boiler is likely suffering from a build-up of limescale or sludge inside the heat exchanger, causing it to vibrate or 'kettle' like a noisy tea kettle.
P1 High Your boiler has lost power to its main control system because a small internal safety fuse has blown.
P1, P2, P3, P1... Low Your boiler is currently performing a self-test and starting up its internal system, which typically happens after the power has been turned off and back on.
P2 Low Your boiler is simply running through its automatic diagnostic checks after being switched on and this is not an actual fault.
P3 High Your boiler has lost power to its internal control board because a protective fuse has blown, meaning the system cannot run.
P4 Low Your boiler is currently running its own internal health check as it starts up and may just need a moment to finish.
P5 Low Your boiler is simply running a routine internal check as it starts up and there is no actual fault with the appliance.
P6 Low Your boiler is simply performing a routine internal check as it starts up and the code should disappear after a few seconds.
r1 Low Your boiler is currently restoring its internal settings back to the original factory standards.

Status & diagnostic codes

These codes indicate your boiler's operating state or a diagnostic reading — not necessarily a fault. Status codes (S.) mean normal operation; diagnostic codes (D.) are informational readings used by engineers.

Code Type Description
d3 Diagnostic Your boiler has lost its connection to an external safety device or a specific wiring link is missing, causing it to shut down for protection.

Worcester Bosch 29 HE Conventional 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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