Low
d.06 on Glow-worm MicraCom

Your boiler is simply displaying the current temperature setting you have selected for your hot water.

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

Target domestic hot water temperature

From this model's manual
Verified against the Glow Worm Micracom installation & service manual, page 40.
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

This is not a fault code, but an information status display.Observe the screen as it will revert to showing the current system pressure or water temperature automatically.No action is required as the boiler is operating normally.

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