D.71 Low
Your boiler is currently set to run at its maximum possible heating temperature, meaning it is working as hard as it can to heat your radiators.
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 panel (marked with a radiator icon).Turn the knob slightly to the left to reduce the target temperature to a more efficient level (e.g., 65-70°C).Observe the display to ensure the temperature setting has updated.
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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