BoilerFaultCodes.com

Worcester Bosch Greenstar 30HE Fault Codes

Combi Natural GasLPG 30 kW 2003-2007 Discontinued
GC Number: 47-311-56

Replaced by: Greenstar 30i

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 to operate safely.
May be DIY safe · £60-120
A7
Your boiler is struggling to accurately measure the temperature of your hot water, which usually means your taps will only run cold or slightly warm.
Gas Safe engineer required · £90-160
A8
Your boiler's internal computer has lost its connection with the main control board, preventing the system from operating.
Gas Safe engineer required · £150-£450

All 19 fault codes

Code Severity Plain English
A1 High Your boiler has detected that there is not enough water circulating through the system to operate safely.
A7 High Your boiler is struggling to accurately measure the temperature of your hot water, which usually means your taps will only run cold or slightly warm.
A8 High Your boiler's internal computer has lost its connection with the main control board, preventing the system from operating.
AC High Your boiler's main control computer is unable to communicate with its internal plug-in components, meaning the system cannot safely start up.
Ad Medium Your boiler is unable to detect the temperature sensor for your hot water tank, which means it doesn't know when to heat your water.
b1 High Your boiler's internal computer is having trouble communicating with its identity chip, meaning it doesn't recognize its own settings.
C1 High Your boiler has stopped working because the internal fan, which clears exhaust gases, isn't spinning fast enough to operate safely.
C4 High Your boiler's fan is running constantly or at the wrong time, which is usually caused by a safety component failing to tell the fan when to stop.
C6 High Your boiler's fan is spinning faster than it should, which has caused the system to shut down for safety purposes.
CC Low Your boiler has lost connection with its outdoor thermometer, meaning it cannot automatically adjust your heating based on the weather outside.
E2 High Your boiler has detected a faulty internal temperature sensor, which means it cannot accurately measure how hot the water is and has stopped running for safety.
E9 High Your boiler has switched itself off because it has detected that it is getting far too hot inside.
EA High Your boiler is failing to light the gas or isn't detecting that the flame has started, causing the system to shut down for safety.
F0 High Your boiler's internal computer has encountered a communication error or software glitch that is preventing it from running safely.
F7 High Your boiler is still sensing a flame even when it should be turned off, which is a safety conflict that prevents the system from starting.
FA Emergency Your boiler is still detecting a flame even after it should have turned off, which is a safety concern that prevents the system from running.
FC High Your boiler's main control board is having trouble communicating with the display panel, meaning the system cannot correctly send or receive instructions.
Fd Low Your boiler has been put into a temporary reset mode because the button was held down too long or pressed accidentally.
P1, P2, P3, P1... Low Your boiler is simply starting up and checking its internal systems as part of a normal restart process.

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 safety connection to the external controls or the internal emergency stop circuit has been interrupted.

Worcester Bosch Greenstar 30HE 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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