BoilerFaultCodesKeston Flow/Return Reversed Fault Code
Also written as FLOWRETURNREVERSED — same fault.
The Keston Flow/Return Reversed fault code means: your boiler has detected that the water is circulating in the wrong direction, which usually means some pipes were connected incorrectly or there is a major issue with the water pump.. It appears on 3 Keston models in our database.
Technical description: Check Pump, Check System Pipework
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Keston models that show the Flow/Return Reversed fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Keston Flow/Return Reversed fault code information on this page is sourced and cross-checked against the official Keston service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026