BoilerFaultCodesTechnical description
Heating mode: Fan overrun. The fan overrun for heating mode is activated.
What causes this fault?
This occurs when the boiler has finished heating your home and needs to blow its internal fan for a short period to remove any remaining heat from the heat exchanger. It is a safety feature that protects the internal components from overheating after the burner has turned off. Your boiler has not actually failed; it is simply performing a standard cooling cycle before it can start again.
This status is more frequently seen during winter when the heating is working hard and the boiler is reaching higher internal temperatures.
DIY fix possible
Wait for a few minutes as this is a normal part of the boiler's operation cycleCheck that your thermostat is set to the desired temperatureEnsure your radiator valves are open to allow heat to dissipate