7 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Greenstar 12Ri Compact
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 →
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Your boiler has detected a critical internal fault and has locked itself out to prevent damage or unsafe operation.
Your boiler has detected that it cannot safely get rid of exhaust gases, so it has stopped working to prevent a buildup of dangerous fumes.
Your boiler has been left in a manual testing mode after a service or inspection and needs to be switched back to its normal operating setting.
Your boiler has been left in its internal testing mode, which is usually only used by engineers during a service or setup.
Your boiler is trying to start but the flame isn't catching, so it has safely shut itself down to prevent gas from building up.
Your boiler is switched on and ready to work, but it isn't responding when you turn up the heating or hot water, usually because an external controller or a valve is failing to tell the boiler to start.
Your boiler appears to have no power and the display is completely dead, meaning it cannot provide any heating or hot water.
BoilerFaultCodes