BoilerFaultCodesBaxi 5 flashes green Fault Code
Also written as 5FLASHESGREEN — same fault.
The Baxi 5 flashes green fault code means: your boiler's internal computer has become confused or has developed a hardware fault, meaning it can no longer communicate correctly with its own components.. It appears on 4 Baxi models in our database.
Technical description: Parameter fault: Parameter error or faulty PU, Configuration error or PCB fault
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Baxi models that show the 5 flashes green fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Baxi 5 flashes green fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.
- Baxi 613 Heat manual (PDF)
- Baxi 800 Heat (range) manual (PDF)
- Baxi EcoBlue Advance Heat manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026