Vaillant boiler ecomax 828 F20 Code - please help

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We are getting a F20 error ' over heat cut off activated' on our combi boiler. The symptoms are boiler starts for a few seconds, temperature increases rapidly to just below 100 degress - then get F20 - no central heating or hot water.

Have checked the pressure which is ok in green area and have reset boiler to no avail - any help please as we have a young family and not sure when an engineer can come out.
 
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it sounds like its not circulating. Could ne a number of reasons for this. If it happens on both heating and hot water it generally rules out the plate he. So I'd be looking at the pump and then after that a potential blockage in the rubber hose, the main heat exchanger and the outlet filter.
 
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