Your boiler is currently set to summer mode, which means it will provide hot water but the central heating is switched off.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: SUMMER SETTING
What causes this fault?
This code appears when the boiler's control knob has been turned to the position that disables the central heating. It is a manual setting designed to stop the radiators from heating up while ensuring you still have plenty of hot water for your taps and shower. To resolve it, you simply need to turn the selector dial back to the position that includes both a radiator and a tap icon.
This code is most frequently seen during the spring and summer months when homeowners intentionally switch off their heating to save energy.
DIY fix possible
Locate the temperature control knob for the central heating on the front panel.Turn the knob clockwise away from the 'Sun' or '0' position to your desired heating temperature.Check that your room thermostat is turned up to trigger a demand for heat.
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