D.7 Low
Your boiler is displaying an information code to show that the pre-heated water feature for your taps is currently active.
Technical description: Warm start temperature target value
Typical repair cost: £0 (including labour)
DIY fix possible
Locate the 'Hot Water' dial or button on the control panelTurn the dial slightly clockwise to activate or counter-clockwise to deactivate the pre-heat (Warm Start) functionNo further action is required as this is a status indicator rather than a fault
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.7 — no call-out fees, no surprises.
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