BoilerFaultCodesWhat the manual says
Manufacturer manualNo heat demand: Summermode
What causes this fault?
This status appears because the central heating temperature control on the front of the boiler has been turned all the way to the off position. It physically prevents the boiler from sending heat to your radiators while still allowing it to provide hot water to your taps. It is a user setting rather than a mechanical failure, often used to save energy during warmer months.
This code is most frequently seen during the summer months when homeowners manually disable their heating to prevent the radiators from coming on.
DIY fix possible
Check your room thermostat is set to a higher temperature than the current room temperatureEnsure your heating timer or programmer is set to 'on'If you only want hot water, note that this code is normal operation for when heating is turned off
Avoid the next call-out bill
A cover plan would handle faults like S.31: no call-out fees, no surprise bills.
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