How much does it cost to fix boiler error code Flow/Return Reversed?

Typical repair cost for the boiler Flow/Return Reversed fault is £150-300 including labour.

Flow/Return Reversed High

Boiler Fault Code Flow/Return Reversed

Also written as FLOWRETURNREVERSED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Flow/Return Reversed appears across 2 boiler brands and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning 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. (As reported on Keston Heat 45)

Pick your boiler brand for the Flow/Return Reversed fix

Ideal Flow/Return Reversed 8 models Keston Flow/Return Reversed 3 models

Source

Information for the Flow/Return Reversed fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026