BoilerFaultCodesTechnical description
Service mode switch in min position.
What causes this fault?
This issue occurs when a technician accidentally leaves a physical switch on the internal control board set to 'minimum' after performing a service or safety check. Because the boiler is being told to stay at its lowest power setting for testing purposes, it cannot respond to your thermostat's request for full heat. It is a simple human error where a manual override was not deactivated before the boiler casing was put back on.
DIY fix possible
Locate the service mode switch (or dial) on the boiler control panel.Ensure the switch is moved from the 'Min' or 'Service' position back to the 'Normal' or 'Off' position.Perform a simple reset by pressing the reset button to clear the flashing light.
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