Low
d.92 on Glow-worm Ultracom 24cx 30cx

Your boiler's internal timer settings are being adjusted or synced, which is a normal status notification rather than a breakdown.

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

Enable/disable internal programmer

From this model's manual
Verified against the Glow Worm Ultracom 24cx 30cx installation & service manual, page 36.
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 or internal timer settings to ensure they are programmed as desiredIf the boiler is operating normally, you can simply ignore this status messageIf the heating is not working, try resetting the timer or the boiler itself

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Avoid the next call-out bill

A cover plan would handle faults like d.92: no call-out fees, no surprise bills.

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