BoilerFaultCodes.com

Worcester Bosch Greenstar Ri Fault Codes

Regular Natural GasLPG 9-24 kW 2005-present
GC Numbers: 41-311-6641-311-6741-311-6841-311-6941-311-7041-311-7141-406-0541-406-0641-406-0741-406-0841-406-0941-406-10

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 →

Most common fault codes

2 pulses
Your boiler has been left in a manual testing mode after a recent service or inspection, which is preventing it from running normally.
May be DIY safe · £0-80
5 pulses
Your boiler has been left in a manual testing mode after a recent service or inspection, which is preventing it from running normally.
May be DIY safe · £0-80
A7
Your boiler is having trouble measuring the temperature of your hot water, which usually means it cannot heat it safely or effectively.
Gas Safe engineer required · £90-160

All 17 fault codes

Code Severity Plain English
2 pulses High Your boiler has been left in a manual testing mode after a recent service or inspection, which is preventing it from running normally.
5 pulses High Your boiler has been left in a manual testing mode after a recent service or inspection, which is preventing it from running normally.
A7 High Your boiler is having trouble measuring the temperature of your hot water, which usually means it cannot heat it safely or effectively.
A8 High Your boiler's internal computer has lost its connection with the main control board, meaning the system cannot communicate correctly to heat your home.
b1 High Your boiler's internal computer memory chip is loose or missing, meaning it cannot identify which model it is supposed to be.
C6 High Your boiler's fan is spinning faster than it should, which means the system has safely shut down to prevent any damage.
CC Low Your boiler has lost connection to its outdoor temperature sensor, meaning it may not heat your home as efficiently as usual.
E2 High Your boiler has lost track of the temperature of the water flowing through it because an internal sensor is broken.
E9 High Your boiler has got too hot and has automatically shut down for safety to prevent damage.
EA High Your boiler has failed to light, which most likely means the gas supply is interrupted or there is a blockage preventing the burner from starting.
F0 High Your boiler's internal computer has encountered a glitch or a hardware failure, preventing it from running properly.
F7 High Your boiler thinks it can still see a flame inside after it has been told to turn off, which is a safety conflict.
FA Emergency Your boiler thinks a flame is still present even though the gas should have been turned off, which is a safety concern that prevents it from running.
Fast flash High Your boiler has detected a critical internal error with its fan or electronic memory and has shut down for safety.
Fd Low Your boiler is temporarily confused because the reset button was held down for too long or pressed when it wasn't needed.
Light on High Your boiler is receiving power and trying to work, but it has failed to start the burner to provide heat or hot water.
No light High Your boiler appears to have no electrical power at all, meaning the screen and lights are completely blank and it will not provide any heating or hot water.

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
d1 Diagnostic Your boiler is struggling to monitor the temperature of the water returning from your radiators, which may cause the system to stop working reliably.

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