Low
i19 on Worcester Bosch Greenstar Heatslave II

Your boiler is simply reporting the current status of your heating timer settings rather than indicating a technical fault.

Monitor it

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.

What the manual says

Manufacturer manual

Time inputs - This indicates the status of the optional fascia mounted controls: 0 = CH off, DHW off, 1 = CH off, DHW on, 2 = CH on, DHW off, 3 = CH on, DHW on

From this model's manual
Verified against the Worcester Bosch Greenstar Heatslave Ii installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check your external programmer or timer dial on the front of the boilerAdjust the settings to your desired schedule for central heating and hot waterIf the code persists despite settings being active, toggle the timer switch off and on to reset the display

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