D.71 Low
Your boiler is notifying you that its central heating temperature has been set to its maximum possible level.
Technical description: Maximum setting of heater control knob
Typical repair cost: £0 (including labour)
DIY fix possible
Locate the heating control knob on the front of the boiler panelTurn the knob slightly to the left to reduce the temperature set-pointCheck if the display returns to the standard pressure or temperature reading
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.71 — no call-out fees, no surprises.
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