Flashing dot D2 High

Gledhill Flashing dot D2 Fault Code

Also written as FLASHINGDOTD2 — same fault.

The Gledhill Flashing dot D2 fault code means: your boiler has detected a general ignition or operational failure and has locked itself out for safety.. It appears on 1 Gledhill model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: A fault is indicated by flashing dot ‘D2’. To reset press ‘set/reset’ button S1.
Typical repair cost £100-280 (including labour)

DIY fix possible

Locate the 'set/reset' button (labelled S1) on the control panel.Press and release the S1 button to clear the fault.Observe if the boiler fires up and the flashing dot disappears.

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Gledhill models that show the Flashing dot D2 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Gledhill Flashing dot D2 fault code information on this page is sourced and cross-checked against the official Gledhill service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026