BoilerFaultCodesWarmflow B-series and Bluebird Fault codes & diagnostics
0 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Heat Only Oil 1990-2015 Discontinued
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Status & diagnostic codes 3 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
3 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
3306 Diagnostic This code is simply a technical reference for your boiler's manual version and does not indicate an actual mechanical fault. CD10 Diagnostic Your boiler is flagging a technical requirement regarding its installation records, which means it needs a certified professional to confirm the setup meets current safety regulations. CD11 Diagnostic Your boiler is displaying a code indicating that the mandatory safety and performance paperwork required after its initial installation or servicing has not been properly registered or finalised.