D.2 Low
Your boiler is taking a short rest to prevent it from switching on and off too frequently, which helps protect the internal components from unnecessary wear.
Technical description: Max burner anti-cycling period at 20c flow temperature
Typical repair cost: £0 (including labour)
DIY fix possible
Wait approximately 15 to 20 minutes for the countdown to end and the boiler to restart automatically.Check that all radiator valves are fully open to allow heat to circulate.Ensure your room thermostat is turned up higher than the current room temperature.
Protect yourself from future repair bills
A boiler cover plan would cover faults like D.2 — no call-out fees, no surprises.
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