BoilerFaultCodesHeatline d.69 Fault Code
Also written as D69 — same fault.
The Heatline d.69 fault code means: your boiler is failing to light the burner after trying twice, so it has shut down as a safety precaution to prevent unburnt gas from building up.. It appears on 7 Heatline models in our database.
Technical description: Unsuccessfull ignitions at second attempt
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like d.69: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Heatline models that show the d.69 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Heatline d.69 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.
- Heatline CaprizPlus 28 manual (PDF)
- Heatline CaprizPlus 24a manual (PDF)
- Heatline Compact 24 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026