BoilerFaultCodesPotterton 4 flashes green Fault Code
Also written as 4FLASHESGREEN — same fault.
The Potterton 4 flashes green fault code means: your boiler has lost the ability for its internal electronic parts to talk to each other correctly, meaning it will likely stop heating your home to stay safe.. It appears on 1 Potterton model in our database.
Technical description: Communication fault (Bad connection or wiring fault, Internal communication fault)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Potterton models that show the 4 flashes green fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton 4 flashes green fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026