Worcester Bosch Heatslave ii Oil not bleeding

5 Oct 2020
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United Kingdom

I'm having trouble with my oil boiler -seems to be an oil feed issue. Gravity fed, though not much of a head. Oil line maybe 2m at best. Oil level low (maybe 150L or so), but not enough to have caused an airlock that I know of. Tried bleeding as per thread https://www.diynot.com/diy/threads/bleed-a-heatslave-ii-2-18-25.495398/ but absolutely nothing comes out of the valve except a pitiful froth for about half a second each time the boiler tries to reset. Wondering if perhaps the weight of oil isn't sufficient to feed the pump, although would have thought the RIELLO RDB would draw irrespective?

Any ideas what might be going on here, or if it's something I'll have to call the pros in for?

Many thanks,

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