BoilerFaultCodesWhat the manual says
Manufacturer manualFan and pump overrun
What causes this fault?
This occurs after the boiler has finished a heating cycle to safely dissipate residual heat from the internal heat exchanger. The fan and pump continue to run briefly to ensure the unit cools down gradually and prevents internal components from overheating. It is a normal safety function of the system rather than a mechanical failure.
This status is more visible during winter months when the boiler is working harder and more frequently to heat the home, leading to more frequent cooling cycles.
DIY fix possible
Wait for the code to clear automaticallyEnsure at least one radiator valve is fully open to allow water flowCheck that the boiler pressure is between 1.0 and 1.5 bar
Avoid the next call-out bill
A cover plan would handle faults like S.6: no call-out fees, no surprise bills.
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Related fault codes
All 135 fault codes on the ecoTEC pro 24
Seeing a different code? Every code this model can display, in one place.