BoilerFaultCodesYour boiler is currently running at its maximum power setting, which is a normal state used by engineers during testing or maintenance.
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: Forced High mode
What causes this fault?
This state is triggered when the boiler is manually set to its maximum firing rate, typically by an engineer using the service buttons on the control panel. It is a deliberate setting used to measure gas pressure or check performance and does not indicate a mechanical failure. If you see this code and no engineer is present, the service switch may have been left in the wrong position or bumped accidentally.
DIY fix possible
Press the 'Reset' button briefly to return the boiler to normal operationSwitch the power to the boiler off and back on at the fused spur switchWait up to 15 minutes as the boiler may automatically exit this mode
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