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My heating system has an intermittent problem, whereby every few months, i get stone cold radiators, as the diverter valve (danfoss HS3) seems to only go to hot water, and when the water is hot enough, the boiler cuts out & thermostat goes off...with no heating. Last October i powerflushed...

I have a camray compact oil fired boiler, which is mounted on internal kitchen wall. Pump is grundfoss selectric 15-50. Water tank is airing cupboard, with smaller tank (reservoir) on top of it - nothing in loft. Since xmas, all radiators have been working except 1 (the largest, in the...