Your boiler's pilot light is failing to remain lit, which prevents the main burner from igniting and means you currently have no heating or hot water.

Technical description

i) Thermocouple not working ii) Thermoelectric valve faulty iii) Gas pressure low/variable iv) Terminal wrongly positioned v) Badly assembled flue vi) Gas pressure too high vii) Water rate too high viii) Incorrect venturi ix) No venturi fitted