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Hi hallega As long as the tank holds oil, the on off valve is on, and works, and the filters at the tank and in the oil line are clean, i cant see it being a tank issue, what can possibly change on a tank that stops the boiler working, when it worked before on that same tank?( was he the one...

The large air bubble should cause no problems, as all wallstars seem to be like this, its streams of bubbles you dont want. If its got a DKO control box on it, replace with a TF, the DKO boxs can cause some very intermittent problems, also if it has the older type EBI spark generator, then...