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You said in your first post that you had 'refilled' with oil. Obviously you must just be putting a 20 litre drum or so in, which is entirely different than getting a proper fill up & would often be hard to bleed the oil line! The Allen screw or the 15mm nut would have bleed it, but you may well have needed a different method to do this with so little oil.
Once it is started, even with only 20 litre top up, the boiler should not be "struggling".
Once it is started, even with only 20 litre top up, the boiler should not be "struggling".
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