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heatslave 9.24 no pressure / hot water?

I bleeded my rads whilst the heating was on which has caused issues with the boiler. it's now not working with no pressure indicated on the gauge. is it an airlock or something? appreciate your recommendations
Neil, February 2014
no it's because there is no pressure.use the filling loop and bring pressure up to around 1.1bar COLD

A1, February 2014