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
Locate the mode or heating button on your boiler's front control panelPress the button to switch the boiler from Summer mode to Winter (combined) modeAdjust your room thermostat or boiler dial to ensure a heat request is being sent
Avoid the next call-out bill
A cover plan would handle faults like S.31: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.