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Unfortunately during the recent cold snap, I ran out of oil. Refilled the tank and bled the oil through the hexagonal bleed screw and all ran well. A few days later and now the Riello Burner will not ignite and goes into lockout. I have tried re-bleeding and there is plenty of oil. I can only...

Recently moved to a house with oil heating system. Everything operated fine. I disconnected the oil supply to move the tank to do some construction work. (well the builder did) When the supply was reconnected, my boiler would not fire up. I have a Rellio RDB burner. I pressed the red 'ignite'...